Antenna device
阅读说明:本技术 天线装置 (Antenna device ) 是由 曾义伟 于 2019-07-01 设计创作,主要内容包括:本发明为一种天线装置,其包括天线元件、馈入部、滤波电路及感应电路。天线元件接收或发送一辐射信号,其中辐射信号包括一第一成分及一第二成分的至少其中之一,且第一成分的频段低于第二成分的频段。馈入部耦接天线元件。滤波电路耦接馈入部,透过馈入部接收辐射信号,并滤除辐射信号中的第二成分以产生一感应信号。感应电路耦接滤波电路,接收感应信号并基于感应信号判断是否有一人体接近天线装置。(The invention relates to an antenna device, which comprises an antenna element, a feed-in part, a filter circuit and an induction circuit. The antenna element receives or transmits a radiation signal, wherein the radiation signal comprises at least one of a first component and a second component, and the frequency band of the first component is lower than that of the second component. The feeding part is coupled with the antenna element. The filter circuit is coupled to the feed-in part, receives the radiation signal through the feed-in part, and filters a second component in the radiation signal to generate an induction signal. The sensing circuit is coupled with the filter circuit, receives the sensing signal and judges whether a human body approaches the antenna device or not based on the sensing signal.)
1. An antenna device, characterized in that:
an antenna element for receiving or transmitting a radiation signal, wherein the radiation signal comprises at least one of a first component and a second component, and the frequency band of the first component is lower than that of the second component;
a feeding part coupled to the antenna element;
a filter circuit, coupled to the feeding part, for receiving the radiation signal through the feeding part and filtering the second component in the radiation signal to generate an induced signal; and
and the sensing circuit is coupled with the filter circuit, receives the sensing signal and judges whether a human body approaches the antenna device or not based on the sensing signal.
2. The antenna device of claim 1, wherein: the filter circuit includes:
a high-pass filter circuit having a first end and a second end, wherein the first end of the high-pass filter circuit is coupled to the feeding portion, and the second end of the high-pass filter circuit is coupled to a ground end; and
the low-pass filter circuit is provided with a first end and a second end, wherein the first end of the low-pass filter circuit is coupled with the first end of the high-pass filter circuit, and the second end of the low-pass filter circuit is coupled with the induction circuit.
3. The antenna device of claim 2, wherein: the high-pass filter circuit may remove the second component from the radiation signal by introducing the second component from the radiation signal to the ground.
4. The antenna device of claim 2, wherein: the low pass filter circuit passes only the first component of the radiation signal to form the induced signal.
5. The antenna device of claim 2, wherein: the high-pass filter circuit comprises a capacitor.
6. The antenna device of claim 2, wherein: the low-pass filter circuit comprises an inductor.
7. The antenna device of claim 1, wherein: the first component includes a baseband component and the second component includes a radio frequency component.
8. The antenna device of claim 1, wherein: when the induction circuit judges that the induction signal only comprises the first component, the induction circuit judges that the human body approaches the antenna device and outputs a control signal to reduce the output power of the antenna element.
9. The antenna device of claim 1, wherein: the feed-in part comprises a feed-in point, and the feed-in point provides the radiation signal only comprising the second component for the antenna element to transmit.
10. The antenna device of claim 1, wherein: the antenna element is a planar inverted-F antenna.
Technical Field
The present invention relates to an antenna device, and more particularly, to an antenna device having a single antenna element with both signal radiation and sensing functions.
Background
With the rapid development of wireless communication technology, wireless terminals such as smart phones are widely used, and the size thereof is gradually reduced. However, while the size of the wireless terminal is miniaturized, in addition to the related difficulty of structural design, the electromagnetic radiation of the wireless terminal to the human body will be enhanced accordingly.
Currently, the index for measuring the electromagnetic radiation of the antenna to the human body is Specific Absorption Rate (SAR), which is an electromagnetic wave energy absorption ratio of the wireless terminal. The specific meaning of SAR is: under the action of the external electromagnetic field, an induced electromagnetic field is generated in the human body, and various organs of the human body are all lossy media, so that the electromagnetic field in the human body can generate induced current, and the human body can absorb and dissipate electromagnetic energy. This process can be characterized by SAR, which means the electromagnetic power absorbed or consumed by a unit mass of human tissue in W/kg, or mW/g. The Federal Communications Commission (FCC) of the united states specifies the maximum SAR that various wireless terminals allow when interacting with the human body. Also, the FCC has also regulated that the SAR of a wireless terminal should be measured when the mobile terminal is near the human brain. Therefore, how to satisfy the electromagnetic radiation standard for the human body while miniaturizing the wireless terminal has become an important issue to be solved urgently in the industry.
In the prior art, an inductive element is generally disposed near an antenna element of a wireless terminal, and the inductive element can be capacitively coupled to the antenna element and used for detecting whether a human body is close to the antenna element. When the sensing element detects that a human body is close to the antenna element, the output power of the antenna element can be correspondingly reduced based on the detection result, so that the electromagnetic wave is prevented from influencing the human body.
However, since the sensing element is separated from the antenna element by a distance and is capacitively coupled to the antenna element, the capacitance and the distance are difficult to control, which may cause high interference between the sensing element and the antenna element and difficult adjustment of the antenna performance. Further, the overall antenna length is still long, making it difficult to install in a miniaturized wireless terminal.
Disclosure of Invention
In view of the above, the present invention provides an antenna device that enables a single antenna element to function as an inductive element for sensing whether a human body approaches the antenna device, in addition to transmitting and receiving radio frequency signals. In this case, the size of the antenna device can be effectively reduced, and the problem of interference between the planar induction circuit and the antenna element control circuit can be effectively solved.
The invention provides an antenna device including an antenna element, a feed portion, a filter circuit, and an induction circuit. The antenna element receives or transmits a radiation signal, wherein the radiation signal comprises at least one of a first component and a second component, and the frequency band of the first component is lower than that of the second component. The feeding part is coupled with the antenna element. The filter circuit is coupled to the feed-in part, receives the radiation signal through the feed-in part, and filters a second component in the radiation signal to generate an induction signal. The sensing circuit is coupled with the filter circuit, receives the sensing signal and judges whether a human body approaches the antenna device or not based on the sensing signal.
In an embodiment of the invention, the filter circuit includes a high-pass filter circuit and a low-pass filter circuit. The high-pass filter circuit has a first end and a second end, wherein the first end of the high-pass filter circuit is coupled to the feeding portion, and the second end of the high-pass filter circuit is coupled to a ground terminal. The low-pass filter circuit has a first end and a second end, wherein the first end of the low-pass filter circuit is coupled to the first end of the high-pass filter circuit, and the second end of the low-pass filter circuit is coupled to the sensing circuit.
In one embodiment of the invention, a high pass filter circuit directs the second component of the radiated signal to ground to remove the second component from the radiated signal.
In an embodiment of the invention, the low pass filter circuit passes only the first component of the radiation signal to form the sense signal.
In an embodiment of the invention, the high pass filter circuit includes a capacitor.
In an embodiment of the invention, the low-pass filter circuit includes an inductor.
In one embodiment of the invention, the first component comprises a fundamental frequency component and the second component comprises a radio frequency component.
In an embodiment of the invention, when the sensing circuit judges that the sensing signal includes only the first component, it is judged that a human body has approached the antenna device, and a control signal is output to reduce an output power of the antenna element.
In an embodiment of the invention, the feed portion includes a feed-in point, and the feed-in point provides a radiated signal including only the second component for transmission by the antenna element.
In an embodiment of the invention, the antenna element is a planar inverted-F antenna.
Based on the above, the antenna device according to the embodiment of the invention can filter out the second component in the radiation signal through the filter circuit provided, and only the first component is transmitted to the sensing circuit. Therefore, the antenna element can be used for transmitting and receiving radio frequency signals and can also be used as an induction element for inducing whether a human body approaches the antenna device or not. In this case, the size of the antenna device can be effectively reduced, and the problem of interference between the planar induction circuit and the antenna element control circuit can be effectively solved.
Drawings
FIG. 1 is a schematic diagram of an antenna apparatus according to one embodiment of the present invention.
Fig. 2 is a schematic diagram of the antenna device according to the embodiment shown in fig. 1.
Description of the symbols
100. 200: antenna device
110: antenna element
120: feed-in part
120 a: feed-in point
130: filter circuit
130 a: high-pass filter circuit
130 b: low-pass filter circuit
140: induction circuit
C1: capacitor with a capacitor element
L1: inductance
And RS: radiation signal
And SS: sensing signal
GND: and a ground terminal.
Detailed Description
Fig. 1 is a schematic diagram of an antenna device according to an embodiment of the invention. In the present embodiment, the antenna device 100 includes an antenna element 119, a
The filter circuit 130 is coupled to the
In fig. 1, the filter circuit 130 may include a high-pass filter circuit 130a and a low-pass filter circuit 130 b. The high-pass filter circuit 130a has a first end and a second end, wherein the first end of the high-pass filter circuit 130a is coupled to the feeding
In the present embodiment, the high-pass filter circuit 130a may introduce the second component (e.g., radio frequency component) in the radiation signal RS into the ground GND to remove the second component from the radiation signal RS. Also, the low pass filter circuit 130b may pass only a first component (e.g., a fundamental frequency component) of the radiation signal RS to form the sensing signal SS.
The
In the present embodiment, the
In this case, the filter circuit 130 can receive the radiation signal RS provided by the feeding
On the other hand, in the second embodiment, when a human body approaches the antenna device 100 and the
In the third embodiment, when a human body approaches the antenna device 100 and the
As described in the third embodiment, when the human body is further away from the antenna device 100 and the
In view of the above, in the antenna apparatus according to the embodiment of the present invention, the second component in the radiation signal can be filtered by the filter circuit provided, and only the first component can be transmitted to the sensing circuit. Therefore, the antenna element can be used for transmitting and receiving radio frequency signals and can also be used as an induction element for inducing whether a human body approaches the antenna device or not. In this case, the size of the antenna device can be effectively reduced, and the problem of interference between the planar induction circuit and the antenna element control circuit can be effectively solved.
Fig. 2 is a schematic diagram of the antenna device according to the embodiment shown in fig. 1. In this embodiment, the
As shown in fig. 2, the capacitor C1 has a first terminal and a second terminal, wherein the first terminal of the capacitor C1 is coupled to the feeding
In the present embodiment, the capacitor C1 can guide the second component (e.g., radio frequency component) in the radiation signal RS to the ground GND to remove the second component from the radiation signal RS. Also, the inductor L1 may pass only a first component (e.g., a fundamental frequency component) of the radiation signal RS to form the sensing signal SS.
Similar to fig. 1, the
In this case, capacitor C1 may filter out the second component of radiation signal RS. As mentioned above, since the radiation signal RS provided by the feeding point 120a may only include the second component (e.g., the rf component) and not include the first component (e.g., the baseband component), when the
On the other hand, when a human body approaches the antenna device 100 and the
In addition, when a human body approaches the antenna device 100 and the
Then, when the human body is further away from the antenna device 100 and the
It should be understood that although the high pass filter circuit 130a and the low pass filter circuit 130b are implemented using the capacitor C1 and the inductor L1, respectively, in FIG. 2, they are not intended to limit the possible embodiments of the present Rich. In other embodiments, the designer may also use the required circuits to implement the high-pass filter circuit 130a and the low-pass filter circuit 130b as required.
In summary, the present invention provides an antenna apparatus, which can filter out the second component (e.g., radio frequency component) of the radiation signal through the high pass filter circuit of the filter circuit, and transmit only the first component (e.g., fundamental frequency component generated by the antenna element sensing the human body) of the radiation signal to the sensing circuit through the low pass filter circuit. Therefore, the single antenna element can be used for transmitting and receiving radio frequency signals and also can be used as an induction element for inducing whether a human body approaches the antenna device. In this case, the size of the antenna device can be effectively reduced, and the problem of interference between the planar induction circuit and the antenna element control circuit can be effectively solved. Therefore, the antenna device of the present invention is more suitable for being installed in a miniaturized wireless terminal.
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