阅读说明：本技术 非对称共平面波导馈入多频宽频天线 (Asymmetric coplanar waveguide-fed multi-frequency broadband antenna ) 是由 陈一锋 彭嘉美 陈家庆 于 2020-06-01 设计创作，主要内容包括：一种非对称共平面波导馈入多频宽频天线,包括：偶极天线具有第一部分及第二部分；第一部分具有第一低频辐射区及第一低频辐射区一侧延伸有信号线,信号线两侧以正交方向延伸有中频辐射区及中高频辐射区,中频辐射区及中高频辐射区经弯折皆朝向第一方向延伸,中频辐射区的面积不等于中高频辐射区,信号线末端具有供预设线缆连接的馈入区；第二部分为共平面波导结构,其具有供预设线缆连接的接地区,接地区经由接地线连接于第二低频辐射区,接地区与接地线之间两侧以正交方向延伸有第一阻抗匹配区与第二阻抗匹配区,第一阻抗匹配区与第二阻抗匹配区各向第一方向及第二方向延伸,通过前述构成以达到单一馈入、多频及宽频且符合Wi-Fi 6E频段的无线天线。(An asymmetric coplanar waveguide fed multi-frequency broadband antenna, comprising: the dipole antenna has a first portion and a second portion; the first part is provided with a first low-frequency radiation area and a signal line extending from one side of the first low-frequency radiation area, the two sides of the signal line extend in the orthogonal direction to form a medium-frequency radiation area and a medium-high frequency radiation area, the medium-frequency radiation area and the medium-high frequency radiation area extend towards the first direction after being bent, the area of the medium-frequency radiation area is not equal to that of the medium-high frequency radiation area, and the tail end of the signal line is provided with a feed-in area for connecting a preset cable; the second part is a coplanar waveguide structure which is provided with a grounding area for connecting a preset cable, the grounding area is connected with the second low-frequency radiation area through a grounding wire, a first impedance matching area and a second impedance matching area extend from two sides between the grounding area and the grounding wire in the orthogonal direction, the first impedance matching area and the second impedance matching area extend in the first direction and the second direction respectively, and the wireless antenna which is single in feed, multi-frequency and broadband and accords with the Wi-Fi 6E frequency band is achieved through the structure.)

1. An asymmetric coplanar waveguide fed multi-frequency broadband antenna, comprising:

a printed circuit board, a dipole antenna is formed on one surface of the printed circuit board, the dipole antenna is provided with a first part and a second part, and a gap is formed between the first part and the second part;

the first part is provided with a first low-frequency radiation area, a signal line extends from one side of the first low-frequency radiation area, an intermediate-frequency radiation area and a medium-high frequency radiation area extend from two sides of the signal line in the orthogonal direction, the intermediate-frequency radiation area and the medium-high frequency radiation area both extend towards the first direction through a bend, the area of the intermediate-frequency radiation area is not equal to that of the medium-high frequency radiation area, and the tail end of the signal line is provided with a feed-in area for connecting a preset cable; and

the second part is a coplanar waveguide structure, which is provided with a grounding area for the connection of the preset cable, the grounding area is connected with a second low-frequency radiation area through a grounding wire, a first impedance matching area and a second impedance matching area extend from two sides between the grounding area and the grounding wire in the orthogonal direction, and the first impedance matching area and the second impedance matching area extend in the first direction and the second direction.

2. The asymmetric coplanar waveguide fed multi-band broadband antenna as claimed in claim 1, wherein the area of the if radiating region is larger than the area of the if radiating region, and the if radiating region is inclined from wide to narrow on the side near the feeding region to the side near the feeding region.

3. The asymmetric coplanar waveguide fed multi-frequency broadband antenna of claim 1, wherein the area of the first impedance matching region is greater than or equal to the area of the second impedance matching region.

4. The asymmetric coplanar waveguide fed multi-frequency broadband antenna as claimed in claim 1, wherein the gap is located in a space defined by two opposite inner sides of the feeding region, the grounding region, the first impedance matching region and the second impedance matching region, the first impedance matching region and the middle-high frequency radiating region are located at one side relative to the signal line and the ground line, and the second impedance matching region and the middle-high frequency radiating region are located at the other side relative to the signal line and the ground line.

5. The asymmetric coplanar waveguide fed multi-frequency broadband antenna as claimed in claim 1, wherein the signal line length is 1/4 wavelengths of center frequency and the ground line length is 1/4 wavelengths of center frequency.

6. The asymmetric coplanar waveguide fed multi-frequency broadband antenna as claimed in claim 1, wherein the first impedance matching region and the second impedance matching region have opposite outer lengths of 1/4 wavelengths of center frequency.

7. The asymmetric coplanar waveguide fed multi-frequency broadband antenna as claimed in claim 1, wherein the first low frequency radiating area has an isosceles trapezoid shape and the second low frequency radiating area has a concave shape.

8. The asymmetric coplanar waveguide fed multi-frequency broadband antenna as claimed in claim 1, wherein the first impedance matching region connected to the second impedance matching region has an appearance of approximately an "H" shape.

9. The asymmetric coplanar waveguide fed multi-frequency broadband antenna as claimed in claim 1, wherein the mid-band radiating region is connected to the mid-band radiating region with an appearance approximating a "U" shape.

10. The asymmetric coplanar waveguide fed multi-frequency broadband antenna as claimed in claim 1, wherein the dipole antenna is a dipole asymmetric array antenna applied in the WiFi 6E band, and the WiFi 6E band has a low frequency operation range from 2400MHz to 2500 MHz; the intermediate frequency operating frequency range of the WiFi 6E is from 5150MHz to 5900 MHz; and the middle-high frequency operating frequency band of the WiFi 6E ranges from 5150MHz to 7125 MHz.

Technical Field

The invention provides an asymmetric coplanar waveguide feed-in multi-frequency broadband antenna, in particular to a dipole antenna, wherein a first part of the dipole antenna is provided with a first low-frequency radiation area, a signal line extends from one side of the first low-frequency radiation area, two sides of the signal line extend from an orthogonal direction to form a medium-frequency radiation area and a medium-high frequency radiation area, the area of the medium-frequency radiation area is not equal to that of the medium-high frequency radiation area, and the wireless antenna which is single feed-in, multi-frequency and broadband and conforms to a Wi-Fi 6E frequency band is achieved through the structure.

Background

Wireless communication technology is an indispensable link in the convenience of life of the modern society, and there is a comprehensive arrangement of wired and wireless local area networks, and Mobile electronic devices (Mobile devices) must also be correspondingly provided with wireless antennas to receive and transmit signals, and can use the internet and transmit data through the wireless local area networks.

WiFi 6 refers to the latest WiFi specification at present, which is also called IEEE 802.11ax, and is established by the organization of Wi-Fi Alliance in 2019, 9 months, and the formal specification is released, so that products are released on the market in succession. Technically, all ISM bands from 1GHz to 6GHz, i.e., ISM bands (Industrial Scientific Band), are respectively Industrial (Industrial), Scientific (Scientific) and Medical (Medical) as the name implies, and the ISM bands are opened to Industrial, Scientific and Medical institutions when a specific frequency Band is moved in each country. Including the 2.4GHz and 5GHz bands currently most widely used by WiFi, have quadruple throughput and 75% delay reduction compared to 802.11ac, while 802.11ax used up to the 6GHz band is called Wi-Fi 6E, which has a theoretical speed of about 10 Gbps. The actual download speed can reach 700Mbps, which is a high improvement for wireless network in speed and security, so electronic products related to Wi-Fi 6E are being actively developed.

The wireless antenna of the electronic product conforming to the Wi-Fi 6E specification generally belongs to a single body or is integrated with other antennas with different functions, and the existing wireless antenna mostly has a bandwidth utilization rate of about 15%, and the volume of the existing wireless antenna is generally large, so that the circuit layout of the mobile electronic device is affected. On the other hand, the operation bandwidth of the conventional wireless antenna cannot achieve the function of multi-band and wide-band, and how to provide a more ideal multi-band and wide-band antenna without occupying too much space in the electronic product becomes an urgent objective of the present industry.

Disclosure of Invention

In view of the above problems and disadvantages, the inventor of the present invention has devised an asymmetric coplanar waveguide fed multi-band broadband antenna by collecting relevant data and evaluating and considering the data in multiple ways.

The main objective of the present invention is to provide an asymmetric coplanar waveguide fed multi-frequency broadband antenna, which comprises: a printed circuit board, a dipole antenna is formed on one surface of the printed circuit board, the dipole antenna is provided with a first part and a second part, and a gap is formed between the first part and the second part; the first part is provided with a first low-frequency radiation area, a signal line extends from one side of the first low-frequency radiation area, an intermediate-frequency radiation area and a medium-high frequency radiation area extend from two sides of the signal line in the orthogonal direction, the intermediate-frequency radiation area and the medium-high frequency radiation area both extend towards the first direction through a bend, the area of the intermediate-frequency radiation area is not equal to that of the medium-high frequency radiation area, and the tail end of the signal line is provided with a feed-in area for connecting a preset cable; the second part is a coplanar waveguide structure, which has a grounding area for the connection of the preset cable, the grounding area is connected with a second low-frequency radiation area through a grounding wire, a first impedance matching area and a second impedance matching area extend from two sides between the grounding area and the grounding wire in the orthogonal direction, and the first impedance matching area and the second impedance matching area extend in the first direction and the second direction respectively, so that the wireless antenna which is single feed-in, multi-frequency and broadband and conforms to the Wi-Fi 6E frequency band is achieved through the structure, and meanwhile, the wireless antenna has the advantages of simple structure and good efficiency.

The secondary objective of the present invention is that the area of the if radiation region is larger than the area of the if radiation region, and the if radiation region is inclined from wide to narrow to the if radiation region near the feed-in region.

Another objective of the present invention is to provide a first impedance matching region having an area greater than or equal to the area of the second impedance matching region.

Another objective of the present invention is that the gap is located in a space surrounded by two opposite inner sides of the feeding area, the grounding area, the first impedance matching area and the second impedance matching area, the first impedance matching area and the middle-high frequency radiating area are located on one side opposite to the signal line and the ground line, and the second impedance matching area and the middle-high frequency radiating area are located on the other side opposite to the signal line and the ground line.

In order to achieve the above object, the present invention provides an asymmetric coplanar waveguide fed multi-frequency broadband antenna, which includes:

a printed circuit board, a dipole antenna is formed on one surface of the printed circuit board, the dipole antenna is provided with a first part and a second part, and a gap is formed between the first part and the second part;

the first part is provided with a first low-frequency radiation area, a signal line extends from one side of the first low-frequency radiation area, an intermediate-frequency radiation area and a medium-high frequency radiation area extend from two sides of the signal line in the orthogonal direction, the intermediate-frequency radiation area and the medium-high frequency radiation area both extend towards the first direction through a bend, the area of the intermediate-frequency radiation area is not equal to that of the medium-high frequency radiation area, and the tail end of the signal line is provided with a feed-in area for connecting a preset cable; and

the second part is a coplanar waveguide structure, which is provided with a grounding area for the connection of the preset cable, the grounding area is connected with a second low-frequency radiation area through a grounding wire, a first impedance matching area and a second impedance matching area extend from two sides between the grounding area and the grounding wire in the orthogonal direction, and the first impedance matching area and the second impedance matching area extend in the first direction and the second direction.

In an embodiment of the invention, an area of the if radiation region is larger than an area of the if radiation region, and a side of the if radiation region close to the feeding region is inclined from wide to narrow to a side of the if radiation region close to the feeding region.

In an embodiment of the invention, an area of the first impedance matching region is greater than or equal to an area of the second impedance matching region.

In an embodiment of the invention, the gap is located in a space surrounded by two opposite inner sides of the feeding area, the grounding area, the first impedance matching area and the second impedance matching area, the first impedance matching area and the middle-high frequency radiating area are located on one side opposite to the signal line and the grounding line, and the second impedance matching area and the middle-high frequency radiating area are located on the other side opposite to the signal line and the grounding line.

In an embodiment of the invention, the length of the signal line is 1/4 wavelengths of center frequency, and the length of the ground line is 1/4 wavelengths of center frequency.

In one embodiment of the present invention, the two opposite outer lengths of the first impedance matching region and the second impedance matching region are the central frequency 1/4 wavelength.

In an embodiment of the invention, the first low-frequency radiation region has an isosceles trapezoid appearance, and the second low-frequency radiation region has a concave appearance.

In an embodiment of the present invention, the first impedance matching region is connected to the second impedance matching region and has an approximately "H" shape.

In an embodiment of the present invention, the appearance of the middle frequency radiation region connected to the middle frequency radiation region is similar to a "U" shape.

In an embodiment of the present invention, the dipole antenna is a dipole asymmetric array antenna applied to the WiFi 6E frequency band, and the low frequency operating frequency band of the WiFi 6E ranges from 2400MHz to 2500 MHz; the intermediate frequency operating frequency range of the WiFi 6E is from 5150MHz to 5900 MHz; and the middle-high frequency operating frequency band of the WiFi 6E ranges from 5150MHz to 7125 MHz.

Drawings

Fig. 1 is a structural diagram of a printed circuit board with a dipole antenna according to the present invention.

Fig. 2 is an impedance matching diagram of the antenna of the present invention.

Fig. 3 is a diagram of the current distribution and radiation pattern of the antenna in 2400MHz band according to the present invention.

FIG. 4 is a diagram of the current distribution and radiation pattern of the antenna in the 2450MHz band according to the present invention.

Fig. 5 is a diagram of the current distribution and radiation pattern of the antenna in 2500MHz band according to the present invention.

Fig. 6 is a diagram of the current distribution and radiation pattern of the antenna in the 5150MHz band according to the present invention.

FIG. 7 is a graph of the current distribution and radiation field pattern of the antenna in 5470MHz band according to the present invention.

Fig. 8 is a diagram of the current distribution and radiation pattern of the antenna in the 5925MHz frequency band according to the present invention.

Fig. 9 is a diagram of the current distribution and radiation pattern of the antenna in the 6725MHz frequency band according to the present invention.

FIG. 10 is a diagram of the current distribution and radiation pattern of the antenna in the 7125MHz band according to the present invention.

Description of reference numerals: 1-a printed circuit board; 10-clearance; 11-a dipole antenna; 12-a first part; 121-a first low frequency radiation zone; 122-signal lines; 123-intermediate frequency radiation area; 124-medium and high frequency radiation region; 125-feed area; 13-a second part; 131-a ground region; 132-ground line; 133-a second low frequency radiation zone; 134-a first impedance matching region; 135-a second impedance matching region; l1-signal line length; l2-ground wire length; l3 — the opposing outer lengths of the first and second impedance matching regions.

Detailed Description

To achieve the above objects and advantages, and in accordance with the purpose of the invention, as embodied and broadly described herein, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a structural diagram of a printed circuit board with a dipole antenna according to the present invention, and it can be clearly seen from the diagram that the detailed structure and connection relationship of the asymmetric coplanar waveguide fed multi-frequency broadband antenna according to the present invention are as follows:

a printed circuit board 1, a dipole antenna 11 is formed on one surface of the printed circuit board, the dipole antenna 11 has a first portion 12 and a second portion 13, and a gap 10 is formed between the first portion 12 and the second portion 13.

The first portion 12 has a first low-frequency radiating area 121, a signal line 122 extends from one side of the first low-frequency radiating area 121, an intermediate-frequency radiating area 123 and an intermediate-frequency radiating area 124 extend from two sides of the signal line 122 in orthogonal directions, the intermediate-frequency radiating area 123 and the intermediate-frequency radiating area 124 both extend toward the first direction through a bend, the area of the intermediate-frequency radiating area 123 is not equal to the area of the intermediate-frequency radiating area 124, and a feeding area 125 for connecting a predetermined cable (not shown) is provided at the end of the signal line 122.

The feeding structure of the antenna feeding area 125 of the present invention adopts an asymmetric coplanar Waveguide feeding method (Co-Planar Waveguide), and adjusts the length of the signal line protruding from the Planar Waveguide structure to correct the resonant frequency of the high frequency band antenna and improve the impedance matching of the resonant frequency band of the antenna.

The second portion 13 is a coplanar waveguide structure having a grounding region 131 for connecting the predetermined cable, the grounding region 131 is connected to a second low frequency radiation region 133 through a grounding line 132, a first impedance matching region 134 and a second impedance matching region 135 extend from two sides of the grounding region 131 and the grounding line 132 in orthogonal directions, and the first impedance matching region 134 and the second impedance matching region 135 extend in first and second directions, respectively, but in the preferred embodiment of the present invention, the first direction is different from the second direction by an angle of 180 degrees.

The area of the if radiating region 123 is larger than that of the if radiating region 124, and the if radiating region 123 is inclined from wide to narrow on the side close to the feeding region 125 to the side close to the feeding region 125 of the if radiating region 124.

The area of the first impedance matching region 134 is greater than or equal to the area of the second impedance matching region 135.

The gap 10 is located in a space defined by two opposite inner sides of the feeding region 125, the grounding region 131, the first impedance matching region 134 and the second impedance matching region 135, the first impedance matching region 134 and the middle-high frequency radiation region 124 are located on one side opposite to the signal line 122 and the grounding line 132, and the second impedance matching region 135 and the middle-high frequency radiation region 123 are located on the other side opposite to the signal line 122 and the grounding line 132.

The signal line length L1 is 1/4 wavelengths of center frequency, and the ground line length L2 is 1/4 wavelengths of center frequency. Two opposite outer lengths L3 of the first impedance matching region and the second impedance matching region are central frequencies 1/4 wavelengths. In summary, the antenna of the present invention is an asymmetric array dipole antenna belonging to a printed circuit board type asymmetric coplanar waveguide, in order to achieve dual-band or broadband resonance, the length of the coplanar waveguide structure located on the front surface (Top-Side) of the printed circuit board 1 is close to 1/4 wavelengths (λ) of the central frequency (or low frequency operating band), the length of the coplanar waveguide structure formed by the grounding line 132 is close to 1/4 wavelengths (λ) of the central frequency (or low frequency operating band), and the wavelengths (λ) used on the left and right sides of the signal line 122 are calculated by the central frequency of the corresponding high frequency band.

The first low-frequency radiating area 121 has an isosceles trapezoid shape, and the second low-frequency radiating area 133 has a concave shape.

The first impedance matching region 134 is connected to the second impedance matching region 135 in a shape similar to an "H".

The intermediate frequency radiating section 123 is connected to the intermediate frequency radiating section 124 in a substantially U-shaped configuration.

Referring to fig. 2, an impedance matching diagram of the antenna of the present invention is shown, wherein the test frequency range is from 2400MHz to 7125MHz, and a plurality of reference point samples are made according to the linear diagram, as shown in the following table:

frequency MHz	2400	2450	2500	5150	6125	7125
							Return loss dB	-17.740	-31.099	-18.390	-12.499	-16.730	-12.618

From the above table, it can be understood that the return loss of the antenna of the present invention is about-12.618 dB to-31.099 dB in the frequency band from 2400MHz to 7125MHz when operating from low frequency to high frequency, which meets the standard of impedance matching.

Referring to fig. 3 to 10, there are shown an antenna current distribution and radiation pattern diagram in 2400MHz band, an antenna current distribution and radiation pattern diagram in 2450MHz band, an antenna current distribution and radiation pattern diagram in 5150MHz band, an antenna current distribution and radiation pattern diagram in 5470MHz band, an antenna current distribution and radiation pattern diagram in 5925MHz band, an antenna current distribution and radiation pattern diagram in 6725MHz band, and an antenna current distribution and radiation pattern diagram in 7125MHz band according to the present invention, in which the upper left graphs show the power intensity (dB) of electromagnetic wave radiated at an angle of 0 ° to 360 ° in the X-Y axis plane, and the power intensity in the X-Y axis plane is converted into a 3D solid graph, i.e., as shown in the left side, the 3D solid graph is very close to a sphere shape, the electromagnetic wave signals fed into the multi-band broadband antenna by the asymmetric coplanar waveguide of the present invention are very stable without any corners (the corners indicate the areas where the electromagnetic wave cannot be radiated, i.e. the locations where the electromagnetic wave signals are bad). Similarly, the 3D solid pattern of the X-Z axis plane represented by the middle lower pattern also approximates to a sphere shape, which also represents the stability of electromagnetic wave signals, and the 3D solid pattern of the Y-Z axis plane represented by the right lower pattern also approximates to a sphere shape, and as shown by the overall test patterns of FIGS. 3 to 7, the present invention has good antenna radiation patterns in the multi-band of 2400MHz, 2450MHz, 2500MHz, 5150MHz, 5470MHz, 5925MHz, 6725MHz, and 7125 MHz.

In addition to the above listed frequency bands, the dipole antenna 11 of the present invention is a dipole asymmetric array antenna, which is applied to the WiFi 6E frequency band, and the low frequency operation frequency band of the WiFi 6E ranges from 2400MHz to 2500 MHz; the intermediate frequency operating frequency range of the WiFi 6E is from 5150MHz to 5900 MHz; and the middle-high frequency operation frequency band range of the WiFi 6E is from 5150MHz to 7125MHz, and the high-frequency operation frequency band has good performance no matter in any frequency band of low, middle and high frequencies.

The antenna gain and efficiency of the asymmetric coplanar waveguide fed multi-frequency broadband antenna of the invention are sampled and tested, and the data are shown in the following table:

frequency (MHz)	Peak gain (dBi)	3D gain (dBi)	3D radiation efficiency (%)
				2400	3.34	-2.02	63
2450	2.62	-2.01	63
				2500	1.58	-2.40	57
5150	1.83	-2.82	52
				5250	1.65	-2.40	58
5350	1.70	-2.11	62
				5470	2.28	-2.48	56
5600	2.06	-2.60	55
				5725	2.71	-2.11	61
5785	2.97	-2.12	61
				5850	3.09	-2.26	59
5925	3.69	-1.84	65
				6000	3.15	-2.13	61
6125	3.28	-2.26	59
				6225	2.8	-2.26	59
6325	1.21	-2.19	60
				6425	3.6	-2.01	63
6525	3.09	-2.14	61
				6625	4.1	-2.04	63
6725	4.55	-1.92	64
				6825	3.03	-2.26	59
6925	4.07	-2.11	62
				7000	3.29	-2.54	56
7125	3.59	-2.53	56

As can be understood from the above table, in the frequency band ranging from 2400MHz to 7125MHz when the wireless antenna of the present invention operates from low frequency to high frequency, the peak gain (dBi), the 3D gain (dBi) and the 3D radiation performance (%) of the wireless antenna of the present invention all conform to the wireless antenna of multi-frequency and wide-frequency bands and conform to the Wi-Fi 6E frequency band.

From the disclosure of fig. 1 to fig. 10, it can be understood that the present invention is an asymmetric coplanar waveguide fed multi-frequency broadband antenna, including: a printed circuit board, a dipole antenna is formed on one surface of the printed circuit board, the dipole antenna is provided with a first part and a second part, and a gap is formed between the first part and the second part; the first part is provided with a first low-frequency radiation area, a signal line extends from one side of the first low-frequency radiation area, an intermediate-frequency radiation area and a medium-high frequency radiation area extend from two sides of the signal line in the orthogonal direction, the intermediate-frequency radiation area and the medium-high frequency radiation area both extend towards the first direction through a bend, the area of the intermediate-frequency radiation area is not equal to that of the medium-high frequency radiation area, and the tail end of the signal line is provided with a feed-in area for connecting a preset cable; the second part is a coplanar waveguide structure, which has a grounding area for the connection of the preset cable, the grounding area is connected with a second low-frequency radiation area through a grounding wire, a first impedance matching area and a second impedance matching area extend from two sides between the grounding area and the grounding wire in the orthogonal direction, and the first impedance matching area and the second impedance matching area extend in the first direction and the second direction respectively, so that the wireless antenna which is single feed-in, multi-frequency and broadband and conforms to the Wi-Fi 6E frequency band is achieved through the structure, and meanwhile, the wireless antenna has the advantages of simple structure and good efficiency. The antenna is applied to various wireless communication electronic products conforming to the Wi-Fi 6E ISM and has good practicability.

It should be understood that the above-described embodiments are merely exemplary of the present invention and are not intended to limit the scope of the invention as claimed.