阅读说明：本技术 波束可调式天线装置 (Beam adjustable antenna device ) 是由 郑光凯 于 2019-01-03 设计创作，主要内容包括：一种天线装置,包括一第一天线、一第二天线、一多工器,以及一控制器。该第一天线设置于一第一平面上,具有分布于该第一天线本体上的多个第一馈入端,用以发送或接收一第一频率的电磁信号。该第二天线设置于一第二平面上,包括至少4个第二馈入端,用以发送或接收一第二频率的电磁信号。该多工器的一输入端耦接一信号源,一输出端耦接所述多个第一瑞入端及所述至少4个第二馈入端。该控制器控制该多工器,而将从该信号源所输出的一馈入信号,传送到至少一第一馈入端或所述至少4个第二馈入端的至少一者,用以调整该天线装置的波束场型。(An antenna device includes a first antenna, a second antenna, a multiplexer, and a controller. The first antenna is arranged on a first plane and is provided with a plurality of first feed-in ends distributed on the first antenna body and used for sending or receiving an electromagnetic signal with a first frequency. The second antenna is arranged on a second plane and comprises at least 4 second feed-in ends for sending or receiving electromagnetic signals of a second frequency. An input end of the multiplexer is coupled to a signal source, and an output end of the multiplexer is coupled to the first feeding ends and the at least 4 second feeding ends. The controller controls the multiplexer to transmit a feed-in signal output from the signal source to at least one of the at least one first feed-in terminal or the at least 4 second feed-in terminals for adjusting the beam pattern of the antenna device.)

1. An antenna device, comprising:

the first antenna is arranged on a substrate, has a height from a first plane of the substrate, and is distributed on a plurality of first feed-in ends on the body of the first antenna and used for sending or receiving an electromagnetic signal with a first frequency; wherein adjacent ones of the first feed terminals are equidistant from each other on the body of the first antenna;

the second antenna is arranged on the substrate, has a height from a second plane of the substrate and is used for sending or receiving an electromagnetic signal of a second frequency;

the second antenna comprises a central part, at least 4 radiating parts, at least 4 connecting parts and at least 4 second feed-in ends, wherein the radiating parts surround the periphery of the central part;

wherein at least the 4 connecting parts connect the at least 4 radiating parts with the central part from the respective central points of the at least 4 radiating parts;

wherein the at least 4 second feeding terminals are respectively configured at the central points of the at least 4 radiating parts;

a multiplexer, an input end of which is coupled to a signal source, and an output end of which is coupled to the first feeding ends of the first antenna and the at least 4 second feeding ends of the second antenna;

a controller, outputting a control signal to the multiplexer, so that the multiplexer can switch different transmission paths, and transmit a feed-in signal output from the signal source to at least one of at least one first feed-in terminal or the at least 4 second feed-in terminals, so as to adjust the beam pattern of the first antenna or the second antenna.

2. The antenna device of claim 1, wherein the at least 4 radiating portions of the second antenna are arranged in a regular polygon or a ring shape, and the central portion is surrounded by a central point of the regular polygon or the ring shape.

3. The antenna device of claim 1, wherein the second plane is parallel to the first plane; the center point of the central part of the second antenna is aligned with the center of the circle of the first antenna.

4. The antenna device of claim 2, wherein, when the first frequency is lower than the second frequency, the second antenna is disposed within the first antenna when the first plane and the second plane are viewed from above the substrate; when the first frequency is higher than the second frequency, the first antenna is arranged in the at least 4 radiation parts of the second antenna.

5. The antenna device of claim 3, further comprising a plurality of conductor posts disposed on the substrate; when the first frequency is lower than the second frequency, the first feed-in terminal is coupled to the first antenna and the other end of the multiplexer through the conductor pillar, so that the first antenna is higher than the second antenna in the vertical position on the substrate, and the second plane is disposed on the upper surface of the substrate.

6. The antenna device of claim 3, further comprising a plurality of conductor posts disposed on the substrate; when the first frequency is higher than the second frequency, the at least 4 second feeding terminals are coupled to the second antenna and the other end of the multiplexer through the conductor pillar, so that the second antenna is higher than the first antenna in the vertical position on the substrate, and the first plane is disposed on the upper surface of the substrate.

7. The antenna device of claim 5, wherein the length of the conductive post is one quarter to one eighth of a wavelength of the electromagnetic signal of the first frequency.

8. The antenna device of claim 6, wherein the length of the conductive post is one quarter to one eighth of a wavelength of the electromagnetic signal of the second frequency.

9. The antenna device according to claim 1, wherein the first antenna has a current path length corresponding to one-half wavelength of the electromagnetic signal of the first frequency when transmitting or receiving the electromagnetic signal of the first frequency; when the second antenna sends or receives the electromagnetic signal of the second frequency, the corresponding current path length is one half wavelength of the electromagnetic signal of the second frequency.

10. The antenna apparatus of claim 1, wherein when the controller selects at least one of the at least one first feeding terminal or the at least 4 second feeding terminals, the remaining first feeding terminals and second feeding terminals are in an open state.

11. The antenna device of claim 1, wherein the number of the plurality of first feeding terminals is at least 4.

12. The antenna apparatus of claim 3, further comprising a plurality of third antennas and a second controller; wherein the plurality of third antennas are disposed around the first antenna and the second antenna, each of the plurality of third antennas including:

an antenna excitation element coupled to the signal source for transmitting or receiving the electromagnetic signals of the first frequency and the second frequency; wherein the antenna excitation element is disposed on the surface of the substrate;

at least 3 field adjusting plates, wherein each of the field adjusting plates stands on the surface of the substrate, surrounds the antenna excitation element, and is coupled with the substrate through a switch;

the second controller controls the switch coupled to at least one of the field adjusting plates to connect the field adjusting plate with the substrate and ground the substrate, thereby adjusting the beam pattern of the antenna excitation element.

Technical Field

The present invention relates to antenna devices, and more particularly, to a beam adjustable antenna device.

Background

With the rapid development of wireless communication demand, the communication of multimedia information has increased dramatically, and next generation wireless communication technologies must meet the application requirements of high speed, high capacity, high quality and high elasticity, and need to be supported by high efficiency spectrum application technology, wherein spectrum must become one of the increasingly valuable resources. In view of this, the wireless communication system should consider the improvement of Radio Access (Radio Access) capability, and expect to achieve the best spectrum operation efficiency. In the current technical development, the Wi-Fi support is mostly a MIMO (Multiple-input And Multiple-output) system architecture, but based on the existing Wi-Fi applied to the existing communication system, the traditional Antenna has not been enough to meet the current communication requirement, And an effective approach for improving the spectrum resource efficiency, the system capacity And the communication quality is further required by a Smart Antenna (Smart Antenna) technology.

The conventional antenna is basically implemented by a plurality of antennas, and a plurality of antennas mutually compensate the field pattern to achieve the required effect. Since the radiation pattern of the antenna itself is fixed, the placement and size of the individual antennas need to be considered, which is also a main cause of space waste. Fig. 1A is a schematic diagram of a pattern of a conventional antenna 3x3 patch (patch) antenna. As shown in fig. 1A, the patch antenna has directivity (e.g., a first patch antenna group field 100, a second patch antenna group field 102, and a third patch antenna group field 104) due to its antenna field, and if the field needs to be compensated, many antennas are needed to compensate each insufficient dead angle, and although the gain is higher than that of a dipole antenna (direct antenna), the directivity is directivity (direct), and the beam width is narrow. Fig. 1B is a schematic diagram of a conventional 3x3 dipole antenna. As shown in fig. 1B, the dipole antenna has an omni-directional pattern (e.g., the first dipole antenna group pattern 106, the second dipole antenna group pattern 108, and the third dipole antenna group pattern 110), and has a wider beam width but lower gain, and requires multiple antennas to reinforce the pattern.

Fig. 1C is a schematic diagram of the Smart Antenna (Smart Antenna). As shown in fig. 1C, the smart antenna can switch the pattern to a desired direction (e.g., the first smart antenna pattern 112, the second smart antenna pattern 114, and the third smart antenna pattern 116) according to the user's requirement, and the smart antenna can be compensated for the space without requiring more antennas due to dead space of the pattern, and the gain is higher than that of the conventional dipole antenna. In conventional wireless network applications, space Diversity (Spatial Diversity) is usually used to generate complementary radiation patterns to obtain Diversity Gain (Diversity Gain) to combat the multipath fading phenomenon of wireless channel and enhance the wireless access capability. Smart antennas may utilize signal directional branch beam forming (Beamforming) techniques to generate a particular beam shape; the main beam is directed to the target signal to enhance the reception quality.

Most of the current smart antennas use a plurality of antennas as a group to make a switching mechanism, and the overall field pattern is changed by switching different antennas therein, but the structure is very complex and the size is correspondingly increased, so that an excessive space is required to be consumed to form the antenna unit.

Disclosure of Invention

An antenna apparatus according to an embodiment of the present invention includes a first antenna, a second antenna, a multiplexer, and a controller. The first antenna is arranged on a substrate, has a height from a first plane of the substrate, and is distributed on a plurality of first feed-in ends on the body of the first antenna, and is used for sending or receiving an electromagnetic signal with a first frequency; wherein adjacent ones of the first feeding terminals are equidistant from each other on the body of the first antenna. The second antenna is arranged on the substrate, has a height from a second plane of the substrate, and is used for sending or receiving an electromagnetic signal with a second frequency, wherein the second antenna comprises a central part, at least 4 radiation parts, at least 4 connecting parts and at least 4 second feed-in ends, and the periphery of the central part is surrounded by the radiation parts. Wherein at least the 4 connecting parts connect the at least 4 radiating parts with the central part from the respective central points of the at least 4 radiating parts. Wherein the at least 4 second feeding terminals are respectively configured at the central points of the at least 4 radiating parts. An input end of the multiplexer is coupled to a signal source, and an output end of the multiplexer is coupled to the first feeding ends of the first antenna and the at least 4 second feeding ends of the second antenna. The controller outputs a control signal to the multiplexer, so that the multiplexer can switch different transmission paths, and transmits a feed-in signal output from the signal source to at least one of at least one first feed-in terminal or at least 4 second feed-in terminals, so as to adjust the beam pattern of the first antenna or the second antenna.

The antenna device as described above, wherein the at least 4 radiating portions of the second antenna are arranged in a regular polygon or a ring, and the central portion is surrounded by a central point of the regular polygon or the ring.

The antenna device as described above, wherein the second plane is parallel to the first plane; the center point of the central part of the second antenna is aligned with the center of the circle of the first antenna.

The antenna device as described above, wherein when the first frequency is lower than the second frequency, the second antenna is disposed inside the first antenna when the first plane and the second plane look down on the substrate; when the first frequency is higher than the second frequency, the first antenna is arranged in the at least 4 radiation parts of the second antenna.

The antenna device further includes a plurality of conductor posts disposed on the substrate; when the first frequency is lower than the second frequency, the first feed-in terminal is coupled to the first antenna and the other end of the multiplexer through the plurality of conductor columns, so that the first antenna is higher than the second antenna in the vertical position on the substrate, and the second plane is disposed on the upper surface of the substrate.

The antenna device further includes a plurality of conductor posts disposed on the substrate; when the first frequency is higher than the second frequency, the at least 4 second feeding terminals are coupled to the second antenna and the other end of the multiplexer through the plurality of conductor posts, so that the second antenna is higher than the first antenna in a vertical position on the substrate, and the first plane is disposed on the upper surface of the substrate.

The antenna device as described above, wherein the length of the conductor pillar is one-quarter to one-eighth wavelength of the electromagnetic signal of the first frequency.

The antenna device as described above, wherein the length of the conductor pillar is one-quarter to one-eighth wavelength of the electromagnetic signal of the second frequency.

The antenna device as described above, wherein when the first antenna transmits or receives the electromagnetic signal of the first frequency, the corresponding current path length is 0.45 to 0.5 wavelength of the electromagnetic signal of the first frequency; when the second antenna transmits or receives the electromagnetic signal of the second frequency, the corresponding current path length is 0.45-0.5 wavelength of the electromagnetic signal of the second frequency.

The antenna device as described above, wherein when the controller selects at least one of the at least one first feeding terminal or the at least 4 second feeding terminals, the remaining first feeding terminals and the remaining second feeding terminals are in an open circuit state.

The antenna device as described above, wherein the number of the first feeding terminals is at least 4.

The antenna device further comprises a plurality of third antennas and a second controller; the third antennas are configured around the first antenna and the second antenna, and each of the third antennas comprises an antenna excitation element and at least 3 field pattern adjusting plates. The antenna excitation element is coupled with the signal source and used for sending or receiving the electromagnetic signals of the first frequency and the second frequency; wherein the antenna excitation element is disposed on the surface of the substrate. Each of the field adjusting plates stands on the surface of the substrate, surrounds the antenna excitation element, and is coupled with the substrate through a switch. The second controller controls the switch coupled to at least one of the 3 field adjusting plates to connect the 3 field adjusting plates to the substrate and ground, thereby adjusting the beam pattern of the antenna excitation element.

Drawings

Fig. 1A is a schematic diagram of a pattern of a conventional antenna 3x3 patch (patch) antenna;

fig. 1B is a schematic diagram of a conventional 3x3 dipole (dipole) antenna;

FIG. 1C is a schematic diagram of a Smart Antenna (Smart Antenna);

fig. 2A is a block diagram of an antenna apparatus according to an embodiment of the present invention;

fig. 2B is a top view of the first antenna and the second antenna according to the embodiment of the invention;

fig. 2C is a perspective view of a first antenna and a second antenna according to an embodiment of the invention;

FIG. 2D is a cross-sectional view of a first antenna and a second antenna according to an embodiment of the invention;

fig. 2E is a top view of the first antenna and the second antenna according to another embodiment of the invention;

fig. 2F is a top view of a first antenna and a second antenna according to another embodiment of the invention;

fig. 3 is a schematic diagram illustrating a change of a beam pattern corresponding to a first antenna switching first feeding end according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating a change of a beam pattern corresponding to a second feeding terminal switched by a second antenna according to an embodiment of the present invention;

fig. 5A is a top view of a third antenna according to the embodiment of the invention;

fig. 5B is a top view of the first, second and third antennas according to the embodiment of the invention;

fig. 5C is a cross-sectional view of the first antenna, the second antenna, and the third antenna according to the embodiment of the invention.

Description of the symbols

100-first patch antenna array pattern

102-second patch antenna array pattern

104-third patch antenna array pattern

106-first dipole antenna pattern

108-second dipole antenna pattern

110-third dipole antenna group pattern

112-first smart antenna pattern

114 to second smart antenna patterns

116-third smart antenna patterns

200-antenna device

202-first antenna

204 to the second antenna

206-multiplexer

208-controller

210-signal source

212-multiple first feed-in terminals

212-1, 212-2, 212-3, 212-4 to the first feed-in terminal

214 to at least 4 second feed-in terminals

214-1, 214-2, 214-3, 214-4 to a second feed-in terminal

216-feed signal

218-first plane

220 to second plane

222-substrate

224-conductor column

226-1, 226-2, 226-3, 226-4 to the connecting part

228-1, 228-2, 228-3, 228-4 to the radiation part

230 central part

500-third antenna

502-antenna excitation element

504-1, 504-2, 504-3 ~ field type adjusting plate

506-switch

Detailed Description

Fig. 2A is a block diagram of an antenna apparatus according to an embodiment of the invention, as shown in fig. 2A, the antenna apparatus 200 includes a first antenna 202, a second antenna 204, a multiplexer 206, and a controller 208, the first antenna 202 has a plurality of first feeding terminals 212 distributed on its antenna body, in this embodiment, the number of the plurality of first feeding terminals 212 is 4, and the first antenna 202 is configured to transmit or receive an electromagnetic signal of a first frequency, the second antenna 204 has at least 4 second feeding terminals 214 configured to transmit or receive an electromagnetic signal of a second frequency, one end of the multiplexer 206 is coupled to a signal source 210, and the other end of the multiplexer is coupled to the plurality of first feeding terminals 212 of the first antenna 202 and the at least 4 second feeding terminals of the second antenna, the controller 208 outputs a multiplexer control signal SE L to the multiplexer 206, so that the multiplexer 206 can switch different transmission paths, and a feeding signal 216 (which may be a signal of the first frequency or the second frequency) output by the signal source 210 is transmitted to at least one of the first feeding terminals 212 or the second feeding terminals 214, and at least one of the first antenna 202 or the second feeding terminals 214 is configured to adjust a beam.

Fig. 2B, 2C, and 2D are top, perspective, and cross-sectional views of a first antenna and a second antenna according to an embodiment of the invention. As can be seen from fig. 2B and 2D, the first antenna 202 is disposed on a first plane 218, and each of the plurality of first feeding ends 212 (including the first feeding ends 212-1, 212-2, 212-3, and 212-4) is equidistant from each other on the body of the first antenna. For example, as shown in fig. 2B, assuming that the first feeding end 212-1 is located at 0 ° of the first antenna 202, the first feeding ends 212-2, 212-3, 212-4 are respectively distributed at 90 °, 180 °, and 270 ° of the first antenna, so that the first feeding end 212-1 is equidistant to the first feeding end 212-2, the first feeding end 212-2 is equidistant to the first feeding end 212-3, the first feeding end 212-3 is equidistant to the first feeding end 212-4, and the first feeding end 212-4 is equidistant to the first feeding end 212-1. Therefore, when the first antenna 202 radiates, the corresponding current path lengths are also equal, for example, when the feeding signal 216 is fed from the first feeding terminal 212-1, the corresponding current path lengths when it radiates are the distances between the first feeding terminals 212-1 to 212-2 on the body of the first antenna 202. In the present embodiment, the second antenna 204 is disposed inside the first antenna 202 when viewed from the first plane 218 and the second plane 220 to the substrate 222.

For example, when the electromagnetic wave signal of the first frequency transmitted or received by the first antenna 202 is 2.4GHz, the distance between the first feeding ends 212-1 to 212-2 on the first antenna 202 body needs to be one-half wavelength of the electromagnetic wave signal of the first frequency, i.e. about 0.0625 m. When the electromagnetic wave signal of the first frequency transmitted or received by the first antenna 202 is the electromagnetic wave signal of 5GHz, the distance between the first feeding ends 212-1 to 212-2 on the body of the first antenna 202 needs to be one-half wavelength of the electromagnetic wave signal of the first frequency, i.e. about 0.03 m.

The second antenna 204 is disposed on a second plane 220 (here, for example, disposed on the surface of the substrate 222), and the second antenna 204 includes a central portion 230, at least 4 radiating portions 228-1, 228-2, 228-3, 228-4, at least 4 connecting portions 226-1, 226-2, 226-3, 226-4, and at least 4 second feeding ends. The arrangement of the at least 4 radiating portions 228-1, 228-2, 228-3, 228-4 may generally define a regular polygon or a ring shape, and surround the central portion 230 at a center point of the regular polygon or the ring shape. The at least 4 connecting portions 226-1, 226-2, 226-3, 226-4 connect the at least 4 radiating portions 228-1, 228-2, 228-3, 228-4 with the central portion 230 from the central point of each of the at least 4 radiating portions 228-1, 228-2, 228-3, 228-4, so that the second antenna 204 has a substantially "tian" -shaped configuration. The at least 4 second feeding ends 214 (including the second feeding ends 214-1, 214-2, 214-3, 214-4) are each disposed at a center point of the at least 4 radiating portions 228-1, 228-2, 228-3, 228-4. As shown in fig. 2C, the second antenna 204 is formed on two corresponding planes of a Printed Circuit Board (PCB) (not shown), and the two corresponding planes of the PCB are coupled by a through-hole (punchhole) technique. The electromagnetic wave signal of the second frequency is fed into the second antenna 204 from the second feeding terminals 214-1, 214-2, 214-3, 214-4, and is radiated by the second antenna 204 on the lines on both sides of the printed circuit board through the connection of the through holes.

When the second antenna 204 starts to radiate, for example, if the feeding signal 216 is fed from the second feeding terminal 214-1 to the second antenna 204 by selection of the controller 208, the current path corresponding to the radiation starts to flow from the second feeding terminal 214-1, through the central portion 230, and to the terminal a of the radiation portion 228-3 where the second feeding terminal 214-3 is located. For example, when the second frequency electromagnetic wave signal transmitted or received by the second antenna 204 is 5GHz, the corresponding wavelength is about 0.06 m (λ (wavelength) ═ C (speed of light) ÷ f (frequency)), that is, the wavelength is (3 × 10 ═ f (frequency)⁸)÷(5*10⁹) Therefore, the distance from the second feeding point 214-1 to the end point A of the radiating portion 228-3 where the second feeding point 214-3 is located needs to be one-half wavelength of the electromagnetic wave signal of the second frequency, i.e., about 0.03 m. When the second frequency electromagnetic wave signal transmitted or received by the second antenna 204 is a 2.4GHz electromagnetic wave signal, the corresponding wavelength is about 0.125 m, and therefore the distance from the second feeding point 214-1 to the end point a of the radiation portion 228-3 where the second feeding point 214-3 is located needs to be one-half wavelength of the second frequency electromagnetic wave signal, i.e., about 0.0625 m.

As shown in fig. 2D, first plane 218 is parallel to second plane 220, and a center point of center portion 230 of second antenna 204 is aligned with a center of loop antenna 202. The substrate 222 is disposed under the first plane 218 and the second plane 220. When the first frequency is lower than the second frequency, for example, the first frequency is 2.4GHz and the second frequency is 5GHz, when looking down from the first plane 218 and the second plane 220 to the substrate 222, since the current path of the first frequency corresponding to the first antenna 202 is longer, the current path of the second frequency corresponding to the second antenna 204 is shorter, and the size of the first antenna 202 is larger than that of the second antenna 204, the second antenna 204 is disposed in the first antenna 202. On the contrary, in another embodiment, when the first frequency is higher than the second frequency, for example, the first frequency is 5GHz and the second frequency is 2.4GHz, when the first plane 218 and the second plane 220 are viewed from the top to the substrate 222, since the current path of the second frequency corresponding to the second antenna 204 is longer, the current path of the first frequency corresponding to the first antenna 202 is shorter, and the size of the second antenna 204 is larger than that of the first antenna 202, the first antenna 202 is disposed within the at least 4 radiation portions 228-1, 228-2, 228-3, and 228-4 of the second antenna 204.

In the embodiment of the present invention, as shown in fig. 2D, when the first frequency is lower than the second frequency, for example, the first frequency is 2.4GHz and the second frequency is 5GHz, the first feeding end 212 is coupled to the first antenna 202 and the other end of the multiplexer 206 through the conductive pillars 224, so that a vertical position of the first plane 218 on the substrate 222 where the first antenna 202 is located is higher than a second plane 220 on the substrate 204 where the second antenna 204 is located, and the second plane 220 is disposed on the upper surface of the substrate 222. In the present embodiment, the length of the conductive pillar 224 is one-quarter to one-eighth of the wavelength of the electromagnetic signal of the first frequency, i.e., about 0.015625 m to 0.03125 m. The plurality of conductive pillars 224 are coupled to the other end of the multiplexer 206 through a layout circuit on the substrate 222.

In another embodiment, when the first frequency is higher than the second frequency, for example, the first frequency is 5GHz and the second frequency is 2.4GHz, at least 4 second feeding terminals 214 are coupled to the second antenna 204 and the other end of the multiplexer 206 through the conductive pillar 224, so that the vertical position of the second plane 220 on which the second antenna 204 is located on the substrate 222 is higher than the first plane 218 on which the first antenna 202 is located, and the first plane 218 is disposed on the upper surface of the substrate 222. In the present embodiment, the length of the conductive pillar 224 is one-quarter to one-eighth of the wavelength of the electromagnetic signal of the second frequency, i.e., 0.015625 m to 0.03125 m.

Fig. 2E is a top view of the first antenna and the second antenna according to another embodiment of the invention. As shown in fig. 2E, in embodiment (1), the first antenna 202 is circular, the second antenna 204 is also circular, and the center of the first antenna 202 is aligned with the center of the second antenna 204. In embodiment (2), the first antenna 202 is a regular polygon, the second antenna 204 is a circle, and the center of the first antenna 202 is aligned with the center of the second antenna 204. In embodiment (3), the first antenna 202 is a regular polygon, the second antenna 204 is a regular polygon, and the center of the first antenna 202 is aligned with the center of the second antenna 204. In embodiment (4), the first antenna 202 is a regular polygon, the second antenna 204 is a regular polygon, and the center of the first antenna 202 is aligned with the center of the second antenna 204. In embodiment (3), compared with embodiment (4), the second antenna 204 of embodiment (4) is arranged at a position rotated by 45 ° from its center point.

Fig. 2F is a top view of the first antenna and the second antenna according to another embodiment of the invention. As shown in fig. 2F, in the embodiment (5), the first antenna 202 is a regular hexagon with 6 first feeding ends; the second antenna 204 is also a regular hexagon and has 6 second feeding terminals. In the embodiment (6), the first antenna 202 is a regular hexagon, and has 6 first feeding ends; the second antenna 204 is square and has 4 second feeding terminals. In the embodiment (7), the first antenna 202 is a regular hexagon, and has 6 first feeding ends; the second antenna 204 is circular and has 4 second feeding terminals.

Fig. 3 is a schematic diagram illustrating a change of a beam pattern corresponding to the first antenna 202 switching the first feeding terminal 212 according to an embodiment of the invention. As shown in fig. 3, the x-y plane is the first plane 218 in fig. 2D. When the first frequency is 2.4GHz, the controller 208 inputs the feeding signal 216 to different first feeding terminals 212-1, 212-2, 212-3, or 212-4 by switching the multiplexer 206, so that the first antenna 202 generates a beam pattern with a corresponding direction as shown in fig. 3, thereby achieving the purpose of adjusting the beam directivity.

Fig. 4 is a schematic diagram illustrating a change of a beam pattern corresponding to the second antenna 204 switching the second feeding terminal 214 according to an embodiment of the present invention. As shown in fig. 4, the x-y plane is the second plane 220 in fig. 2D. When the second frequency is 5GHz, the controller 208 inputs the feeding signal 216 to different second feeding terminals 214-1, 214-2, 214-3, or 214-4, so that the second antenna 204 generates a beam pattern with a corresponding direction as shown in fig. 4, thereby achieving the purpose of adjusting the beam directivity.

In the embodiment of the present invention, when the controller 208 selects at least one of the at least one first feeding terminal 212 or the at least 4 second feeding terminals 214 for inputting the feeding signal 216, the remaining first feeding terminals 212 and second feeding terminals 214 are in an open state. For example, when the controller 208 selects the first feeding terminal 212-3 and the second feeding terminal 214-1 to input the feeding signal 216, the first feeding terminals 212-1, 212-2, 212-4 and the second feeding terminals 214-2, 214-3, 214-4 are all in an open state, so that the isolation is better and the normal operation of the first antenna 202 and the second antenna 204 is not disturbed.

The antenna device 200 further includes a plurality of third antennas 500 and a second controller. Referring to fig. 5A, 5B and 5C, fig. 5A is a top view of a third antenna 500 according to an embodiment of the invention; fig. 5B is a top view of the first antenna 202, the second antenna 204 and the third antenna 500 according to the embodiment of the invention; fig. 5C is a cross-sectional view of the first antenna 202, the second antenna 204, and the third antenna 500 according to the embodiment of the invention. As shown in fig. 5B, the plurality of third antennas 500 are disposed around the first antenna 202 and the second antenna 204. As shown in FIG. 5A, each third antenna 500 includes an antenna excitation element 502 and 3 field adjusting plates 504-1, 504-2, 504-3. The antenna excitation element 502 transmits or receives electromagnetic signals of the first frequency and the second frequency, and the antenna excitation element 502 is disposed on the surface of the substrate 222 (as shown in fig. 5C). For example, antenna excitation element 502 may send or receive electromagnetic wave signals at 2.4GHz or 5 GHz. The 3 field adjusting plates 504-1, 504-2, 504-3 stand on the surface of the substrate 222 and surround the antenna excitation elements, and are each coupled to the substrate 222 through a switch 506. The second controller controls the switch 506 coupled to at least one of the 3 field adjusting plates 504-1, 504-2, 504-3, so that the 3 field adjusting plates 504-1, 504-2, 504-3 can be connected to the substrate 222 and grounded, thereby adjusting the beam pattern of the antenna excitation element 502. Switch 506 may be a diode.

As shown in fig. 5B, a distance between each adjacent third antenna 500 is D, where the distance of D may be 1.3 times to 1.8 times of the wavelength of the electromagnetic wave of the first frequency or the second frequency. For example, when the first frequency is 2.4GHz, the corresponding wavelength is 0.125 m, so the distance D can be 0.1625-0.225 m. In addition, each third antenna 500 surrounds the first antenna 202 and the second antenna 204, and can be distributed at an angle of 360 °/N (N is the number of third antennas), and for fig. 5B, each third antenna 500 is equally distributed around the first antenna 202 and the second antenna 204, and the included angle between every two adjacent third antennas 500 is 90 °.

For example, as shown in fig. 5C, when the antenna excitation element 502 of each third antenna 500 is coupled to the signal source 210 (not shown) to emit an electromagnetic wave signal at the first frequency (e.g., 2.4GHz), and the second controller switches whether the 3 field adjustment plates (e.g., the field adjustment plate 504-1) are grounded or not, so that the beam pattern of the field adjustment plate points to a specific direction, the first antenna 202 also selects at least one first feeding end (e.g., the first feeding end 212-1) as a feeding point of the feeding signal 216 through the controller 208, so that the beam pattern of the first antenna 202 corresponding to the first frequency (2.4GHz) also points to the specific direction, so as to enhance the beam directivity of the entire antenna apparatus 200 at the first frequency. Similarly, at a second frequency (e.g., 5GHz), the second antenna 204 can also enhance the beam directivity of the entire antenna apparatus 200 at the second frequency, and therefore, the description thereof is omitted.

In the present embodiment, for the first antenna 202 and the second antenna 204, in order to determine which of the first feeding end 212 or the second feeding end 214 is the best feeding point, the controller 208 may continuously switch different first feeding ends 212 or second feeding ends 214 to be different feeding points, and simultaneously receive an object signal to be measured and record the corresponding RSSI value thereof. The controller 208 selects the at least one first feeding end 212 or the second feeding end 214 as an optimal feeding point according to the recorded RSSI values.

While embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. Many variations of the above-described exemplary embodiments according to this embodiment may be made without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments. Rather, the scope of the invention should be defined by the following claims and their equivalents.