CN113871868A

CN113871868A - Antenna and electronic equipment

Info

Publication number: CN113871868A
Application number: CN202111467575.0A
Authority: CN
Inventors: 李东升; 李霞; 李敏
Original assignee: Shenzhen Easydetek Electronics Co ltd
Current assignee: Shenzhen Easydetek Electronics Co ltd
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2021-12-31

Abstract

The application provides an antenna and electronic equipment, the antenna includes: the radiation metal patch is arranged on the upper surface of the first dielectric substrate, and the grounding metal sheet is arranged on the lower surface of the first dielectric substrate; the second dielectric substrate is arranged below the grounding metal sheet, and a first signal separation circuit and a second signal separation circuit are arranged on the second dielectric substrate; the radiation metal patch is provided with a radio frequency feed point and a touch feed point, the radio frequency feed point is connected with the microwave signal processor through the first signal separation circuit, and the touch feed point is connected with the touch signal processor through the second signal separation circuit. The antenna of independent touch key switch and microwave sensor can occupy great installation volume's problem in the installation in electronic product has been solved in this application.

Description

Antenna and electronic equipment

Technical Field

The present application relates to the field of antenna technologies, and in particular, to an antenna and an electronic device.

Background

The microwave sensor that is used for moving object detection at present uses more and more extensively, especially has very much application in the illumination, intelligent household electrical appliances field, microwave sensor adopts the antenna to come the receiving and dispatching signal, and current intelligent household electrical appliances except disposing microwave sensor, generally still can set up various key switch, for example touch key switch, touch key switch and microwave sensor's antenna is two independent parts usually, just so need occupy relatively great installation volume in intelligent household electrical appliances, and then increase intelligent household electrical appliances' volume.

Disclosure of Invention

The embodiment of the application provides an antenna and electronic equipment, and the problem that the antenna of an independent touch key switch and a microwave sensor occupies a large installation volume when being installed in an electronic product is solved.

The present invention is achieved as such, an antenna comprising:

the radiation metal patch is arranged on the upper surface of the first dielectric substrate, and the grounding metal sheet is arranged on the lower surface of the first dielectric substrate;

the second dielectric substrate is arranged below the grounding metal sheet, and a first signal separation circuit and a second signal separation circuit are arranged on the second dielectric substrate;

the radiation metal patch is provided with a radio frequency feed point and a touch feed point, the radio frequency feed point is connected with the microwave signal processor through the first signal separation circuit, and the touch feed point is connected with the touch signal processor through the second signal separation circuit.

According to the antenna provided by the embodiment of the application, the microwave signal and the touch signal can be separated through the first signal separation circuit and the second signal separation circuit and are introduced into the corresponding processors, so that the antenna of the application has the functions of microwave transceiving and touch key pressing at the same time, the electronic product can have the functions of microwave transceiving and touch key pressing only by installing the antenna of the application in the electronic product, and the problem that the volume of the electronic product is increased due to the fact that the antenna of the touch key switch and the microwave sensor is installed in the electronic product at the same time is avoided.

In one embodiment, the first signal splitting circuit comprises a capacitor and a microwave antenna feed connected with each other, the radio frequency feed is connected with the capacitor, and the microwave antenna feed is used for connecting a microwave signal processor;

the capacitor is used for blocking low-frequency signals and passing high-frequency signals.

In one embodiment, the capacitor is a high frequency capacitor or a distributed coupling capacitor.

In one embodiment, when the touch feed point is located in the middle of the radiating metal patch, the second signal separation circuit includes a touch feed line, and two ends of the touch feed line are respectively connected to the touch feed point and the touch signal processor;

the middle position of the radiation metal patch is a virtual place which is used for blocking high-frequency signals and passing low-frequency signals.

In one embodiment, when the touch feed point is located in the middle of the radiating metal patch, the second signal separation circuit comprises an inductor and a touch feed line which are connected with each other, the touch feed line is connected with the inductor, and the touch feed line is used for connecting a touch signal processor;

the middle position of the radiating metal patch is a virtual place, and the virtual place and the inductor are used for blocking high-frequency signals and passing low-frequency signals.

In one embodiment, when the touch feed point is located at a non-intermediate position of the radiating metal patch, the second signal separation circuit comprises an inductor and a touch feed line which are connected with each other, the touch feed line is connected with the inductor, and the touch feed line is used for connecting a touch signal processor;

the inductor is used for blocking high-frequency signals and passing low-frequency signals.

In one embodiment, the inductor is an inductor for isolating high frequencies or an equivalent inductor formed by a high impedance transmission line.

In one embodiment, the radiating metal patch has a shape of any one of a rectangle, a circle, and a polygon.

In one embodiment, the microwave signal processor is a radar receiver or a transmitter;

the touch signal processor is a single chip microcomputer or a DSP or an FPGA.

An embodiment of the present application further provides an electronic device including the antenna according to any of the above embodiments.

The application provides an antenna and electronic equipment's beneficial effect lies in: this application separates microwave signal and touch signal through first signal separation circuit and second signal separation circuit, and introduce in the treater that corresponds separately, thereby make the antenna of this application have the function of microwave receiving and dispatching and touch button simultaneously, only need install the antenna of this application just so and can make the electronic product have the function of microwave receiving and dispatching and touch button simultaneously in the electronic product, compare with the antenna of installing touch key switch and microwave sensor simultaneously in the current electronic product, only install the required installation space of reduction that this application's antenna can be very big, and then can reduce the volume of electronic product.

Drawings

Fig. 1 is a schematic structural diagram of an antenna according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of an antenna according to a second embodiment of the present application.

Fig. 3 is a schematic structural diagram of an antenna provided in the third embodiment of the present application.

Fig. 4 is a schematic diagram of an antenna provided in an embodiment of the present application.

Fig. 5 is a schematic diagram of an antenna principle designed on the basis of an existing radar sensor antenna according to an embodiment of the present application.

Reference numerals: 10. a first dielectric substrate;

20. radiating the metal patch; 21. a radio frequency feed point; 22. touching a feed point;

30. a grounding metal sheet;

40. a second dielectric substrate; 41. a first signal separation circuit; 42. a second signal separation circuit; 411. a capacitor; 412. a microwave antenna feed line; 421. touching the feeder line; 422. an inductor;

100. a microwave signal processor;

200. a touch signal processor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 to 4, an antenna provided in the present embodiment includes a first dielectric substrate 10, a radiating metal patch 20 disposed on an upper surface of the first dielectric substrate 10, and a grounding metal patch 30 disposed on a lower surface of the first dielectric substrate; a second dielectric substrate 40, wherein the second dielectric substrate 40 is arranged below the grounding metal sheet 30, and the second dielectric substrate 40 is provided with a first signal separation circuit 41 and a second signal separation circuit 42; the radiating metal patch 20 is provided with a radio frequency feed point 21 and a touch feed point 22, the radio frequency feed point 21 is connected with the microwave signal processor 100 through a first signal separation circuit 41, and the touch feed point 22 is connected with the touch signal processor 200 through a second signal separation circuit 42.

According to the antenna provided by the embodiment of the application, the microwave signal and the touch signal can be separated through the first signal separation circuit 41 and the second signal separation circuit 42 and are introduced into the corresponding processors, so that the antenna of the application has the functions of microwave transceiving and touch key pressing at the same time, the electronic product can have the functions of microwave transceiving and touch key pressing only by installing the antenna of the application in the electronic product, and the problem that the volume of the electronic product is increased due to the fact that the antenna of the touch key switch and the antenna of the microwave sensor are installed in the electronic product at the same time is avoided.

It should be noted that the material grade of the first dielectric substrate 10 may be FR-4 or other microwave dielectric material, FR-4 is a code number of a flame-resistant material grade, and means a material specification that the resin material must be self-extinguishing after burning, which is not a material name, but one grade of material, there are very many varieties of FR-4 grade materials used for general circuit boards, since the FR-4 grade material is common, the price of the FR-4 grade material is relatively low, the FR-4 grade material is adopted to manufacture the first dielectric substrate 10, the material cost of the first dielectric substrate 10 can be reduced, in addition, the thickness of the first dielectric substrate 10 is not limited in the embodiment of the present application, so that the processing difficulty can be reduced, and further the processing and manufacturing cost can be reduced. Of course, other low-loss microwave dielectric materials, such as ceramics, composite materials, teflon, and other materials used for manufacturing high-frequency antennas, may also be used for the first dielectric substrate 10.

It is understood that the shape of the radiating metal patch 20 is any one of a rectangle, a circle, and a polygon. The shape of the radiating metal patch 20 in the present application may be other than the above ones, and the present application is not limited to this embodiment.

Referring to fig. 1-4, the first signal splitting circuit 41 includes a capacitor 411 and a microwave antenna feed 412 connected to each other, the radio frequency feed point 21 is connected to the capacitor 411, and the microwave antenna feed 412 is used for connecting to the microwave signal processor 100; the capacitor 411 is used to block low frequency signals and pass high frequency signals.

It should be noted that, because the frequency of the microwave signal is greatly different from that of the general touch switch signal, the low-frequency signal, i.e., the touch switch signal, can be blocked by the capacitor 411, and the microwave signal passes through, so that the processing of the microwave signal is not interfered by the touch signal.

Optionally, the capacitor 411 is a high-frequency capacitor or a distributed coupling capacitor, as long as it can block a low-frequency touch signal and allow a high-frequency microwave signal to pass through. High-frequency capacitors are basically composed of passive components, active devices and passive networks. The difference between the high frequency capacitance and the low frequency capacitance is determined by the material and structure of which it is made, and not by the capacitance. The high-frequency capacitor is suitable for occasions of high-frequency filtering, such as secondary output rectification of a computer mainboard and a switching power supply, and the low-frequency capacitor is suitable for occasions of low-frequency filtering, such as filtering after alternating current rectification. Coupling capacitance, also known as electric field coupling or electrostatic coupling, is a coupling mode generated due to the existence of distributed capacitance. The coupling capacitor enables a strong current system and a weak current system to be coupled and isolated through the capacitor, a high-frequency signal channel is provided, low-frequency current is prevented from entering the weak current system, and personal safety is guaranteed.

Example one

Referring to fig. 1, when the touch feed point 22 is located in the middle of the radiating metal patch 20, the second signal separation circuit 42 includes a touch feed line 421, and two ends of the touch feed line 421 are respectively connected to the touch feed point 22 and the touch signal processor 200; the middle position of the radiating metal patch 20 is a virtual place which is used for blocking high-frequency signals and passing low-frequency signals.

It should be noted that, the middle position of the radiation metal patch 20 is a virtual point, and the virtual point has a function of blocking high-frequency signals and passing low-frequency signals, so when the touch feed point 22 is located at the middle position of the radiation metal patch 20, it is indicated that the signals transmitted through the touch feed point 22 only have low-frequency touch signals, that is, only low-frequency touch signals can pass through the touch feed point 22, and high-frequency microwave signals are blocked, so that the touch feed point 22 and the touch signal processor 200 are directly connected together through the touch feed line 421 at this time, and then the separation transmission of the high-frequency microwave signals and the low-frequency touch signals can be realized.

Example two

Referring to fig. 2, when the touch feed point 22 is located at the middle position of the radiating metal patch 20, the second signal splitting circuit 42 includes an inductor 422 and a touch feed line 421 connected to each other, the touch feed point 22 is connected to the inductor 422, and the touch feed line 421 is used to connect to the touch signal processor 200; the radiating metal patch 20 is located at the middle position as a virtual ground, and the virtual ground and the inductor 422 are used for blocking high frequency signals and passing low frequency signals.

It should be noted that, the middle position of the radiating metal patch 20 is a virtual point, and the virtual point has a function of blocking high-frequency signals and passing low-frequency signals, so when the touch feed point 22 is located at the middle position of the radiating metal patch 20, it is indicated that the signals transmitted through the touch feed point 22 only have low-frequency touch signals, that is, only low-frequency touch signals can pass through the touch feed point 22, and high-frequency microwave signals can be blocked, so that at this time, in addition to directly connecting the touch feed point 22 with the touch signal processor 200 through the touch feed line 421, the high-frequency signals, that is, the microwave signals, can be blocked through the inductor 422, and the virtual point and the inductor 422 cooperate to block the high-frequency signals, so that the signal separation effect is better.

Optionally, the inductor 422 is an inductance for blocking a high frequency or an equivalent inductance formed by a high impedance transmission line, as long as it can block a high frequency microwave signal and allow a low frequency touch signal to pass through. The inductor may be made by winding a core of electrically conductive material, typically copper wire, and the core may be eliminated or replaced by a ferromagnetic material. There are many types of inductors, most of which are made with an outer enamel coil (enameled wire) wrapped around a ferrite bobbin, while some protective inductors place the coil entirely within the ferrite. The core of some inductive elements can be tuned. The size of the inductance can thereby be varied. Inductive elements for isolating high frequencies are often constructed with a wire that is threaded through a magnetic column or bead.

EXAMPLE III

Referring to fig. 3, when the touch feed point 22 is located at a non-intermediate position of the radiating metal patch 20, the second signal splitting circuit 42 includes an inductor 422 and a touch feed line 421 connected to each other, the touch feed point 22 is connected to the inductor 422, and the touch feed line 421 is used to connect to the touch signal processor 200; the inductor 422 is used to block high frequency signals and pass low frequency signals.

It should be noted that, when the touch feed point 22 is located at a non-middle position of the radiating metal patch 20, the touch feed point 22 cannot pass only the low-frequency touch signal, and at this time, the touch signal and the microwave signal need to be separated, and the inductor 422 can block the high-frequency signal, i.e., the microwave signal, and the processing of the touch signal is not interfered by the microwave signal due to the touch switch signal, because the inductor 422 in this embodiment has a characteristic of blocking the high-frequency microwave signal and allowing the low-frequency touch signal to pass, so that the low-frequency touch signal can be allowed to pass, and the high-frequency microwave signal can be blocked.

Optionally, the inductor 422 is an inductance for blocking a high frequency or an equivalent inductance formed by a high impedance transmission line, as long as it can block a high frequency microwave signal and allow a low frequency touch signal to pass through.

Illustratively, the microwave signal processor 100 is a radar receiver or transmitter; the touch signal processor 200 is a single chip microcomputer, a DSP or an FPGA.

The singlechip in the above-mentioned embodiment can be STM8 singlechip, and the singlechip includes touch button interface, control interface, detection interface and LED pilot lamp. The touch key interface is used for connecting the touch feed point 22; the control interface is used for connecting the control circuit and receiving and transmitting the switching signal output by the control circuit; the detection interface is used for connecting an external detection circuit and detecting the control circuit; the LED indicating lamp is used for indicating the on-off state of the radio frequency switch.

DSP, Digital Signal Processor. This is a microprocessor with a special structure, which is a microprocessor that processes a large amount of information with digital signals. The analog signal is converted into a digital signal for high-speed real-time processing by a special processor. An FPGA (Field-Programmable Gate Array) is a circuit that can be programmed and modified by a user after being manufactured.

The radar receiver is a device for amplifying, converting and processing echo signals in the radar. Most of them use super heterodyne receiver and add various anti-interference circuits. The output signal is sent to a display or a computer and other terminal equipment. The method has the advantages of high sensitivity, good selectivity, strong anti-interference capability and the like. According to different radar systems, one radar has at least one receiver, and some radars have several or even thousands of receivers.

When the antenna realizes the receiving and sending functions of microwave signals, the antenna is used as a common receiving and sending antenna, and a transmitter transmits signals to be transmitted to the antenna for transmission or transmits received signals to a radar receiver for processing.

When the antenna of this application realizes touch key switch function, the antenna of this application just uses as a touch key, and touch-sensitive capacitance change through touch key detects, when detecting there is touch signal, can transmit touch signal to the singlechip and handle the function setting that realizes the product.

It should be noted that, in order to save cost, the antenna of the present application can be directly improved on the existing antenna structure when being designed, such as the antenna of the radar sensor, the radar sensor is used as an active sensor, i.e. the sensor itself generates a radio frequency signal, the radio frequency signal is radiated to the space through the antenna, at the same time, the antenna receives the transmission signal of the surrounding object, because the reflection signal of the fixed object is identical to the transmission signal frequency, and the reflection signal of the moving object additionally generates a doppler shift, thus the reflection signal of the surrounding object is mixed with the transmission signal inside the receiver, the difference frequency output of the reflection mixing of the reflection signal of the fixed object is zero frequency and is not detected, the difference frequency generated by mixing the reflection signal of the moving object and the transmission signal, i.e. the doppler frequency related to the moving speed, the intermediate frequency signal with the doppler frequency is amplified inside the sensor, Filtering and processing, and detecting the signal to detect whether a moving object exists around, the moving speed of the object and other information. This application is introducing the signal separation circuit in original radar sensor circuit and makes microwave signal and touch signal separately independent processing to realize microwave signal receiving and dispatching and touch key switch's function simultaneously, refer to fig. 5, fig. 5 is the antenna circuit schematic diagram of this application that designs on radar sensor's antenna, the resonant frequency of the antenna of this application must be radar sensor's operating frequency, the antenna of this application is only a slice metallic conductor to touch-sensitive, when other conductors (people's finger) are close to and contact this metallic conductor, metallic conductor's electric capacity changes, the treater that has touch function can directly detect this metallic conductor's electric capacity change, judge whether take place the touch incident.

It should be noted that, when the antenna has the function of the touch key switch, the microwave signal and the touch signal are separately processed and cannot interfere with each other, specifically, the touch feed point 22 may be connected to a virtual point of the antenna, or connected to the touch signal processor 200 through an inductor or a high-impedance line; the same rf feed point 21 needs to be connected to the signal transceiver through a capacitor 411 so that changes in sheet metal capacitance caused by a short touch can be avoided.

An embodiment of the present application further provides an electronic device including the antenna in any of the above embodiments.

For example, the antenna in this embodiment may be a radio frequency antenna, when the antenna in this embodiment is used for radio frequency transmission and reception of signals, the radio frequency antenna is connected to a radio frequency electronic chip to form a radio frequency device, and the radio frequency device is applied to an existing electronic device, the radio frequency electronic chip may be a radio frequency electronic tag chip, a radio frequency identification chip, or a radio frequency read-write chip, the radio frequency electronic tag chip may form a radio frequency electronic tag having a radio frequency identification function with the radio frequency antenna, the radio frequency identification chip may form a radio frequency reader with the radio frequency identification function with the radio frequency antenna, and the radio frequency read-write chip may form a radio frequency reader with the radio frequency identification function and the radio frequency identification function together with the radio frequency antenna. In this embodiment, in order to implement the use of the added wireless radio frequency device in cooperation with a main control circuit board (i.e., an existing electronic device), the wireless radio frequency electronic tag chip, the wireless radio frequency identification chip, or the wireless radio frequency read-write chip is connected to a main controller disposed on the main control circuit board. When the wire is actually connected, the wireless radio frequency electronic tag chip, the wireless radio frequency identification chip or the wireless radio frequency read-write chip are connected with the main controller through the connecting circuit and the corresponding connecting port.

In the embodiment of the application, the radio frequency electronic chip is a radio frequency electronic tag chip, and the radio frequency electronic tag chip and the radio frequency antenna form a radio frequency electronic tag with a radio frequency identification function. At this moment, this application still possesses the radio frequency identification function outside having original function to the original function of equipment is realized by the master control circuit board, and the radio frequency identification function that adds can not cause any influence to the original function of equipment. In the actual use process, the portable electronic device can be a portable electronic device such as a mobile phone and a PDA, which is carried by a user, and the portable electronic device has the radio frequency identification function. During practical use, when the RFID electronic tag is required to be used as the RFID electronic tag, the RFID equipment matched with the RFID electronic tag is adopted to read information written by the RFID electronic tag chip so as to realize the function of the RFID electronic tag.

In the same practical use process, the wireless radio frequency electronic chip can also be a wireless radio frequency identification chip or a wireless radio frequency read-write chip. That is, the radio frequency electronic tag chip in this embodiment may be replaced by a radio frequency identification chip or a radio frequency read-write chip.

When the radio frequency electronic chip is a radio frequency identification chip, the radio frequency electronic chip and the radio frequency antenna form a radio frequency interpreter with a radio frequency identification function. At this time, the present application has a radio frequency identification function in addition to the original function. In the practical use process, the main processing device can be a main processing device (the functions of which are mainly realized by the main control circuit board) which can further process the signals read by the radio frequency interpreter, and the main processing device has the radio frequency identification function at the same time. During practical use, when the RFID electronic tag needs to be identified by the RFID electronic tag identification method, the electronic signal sent by the electronic tag is collected through the wireless radio frequency antenna 3, then the signal collected by the wireless radio frequency antenna 3 is identified and processed through the wireless radio frequency identification chip, and then the identification processing result is transmitted to the main controller in the main control circuit board through the wireless radio frequency identification chip.

When the wireless radio frequency electronic chip is a wireless radio frequency read-write chip, the wireless radio frequency electronic chip and the wireless radio frequency antenna form a wireless radio frequency reader-writer which has a wireless radio frequency identification function and a wireless radio frequency identification function at the same time. At this moment, besides the original functions, the wireless radio frequency identification device also has the wireless radio frequency identification function and the wireless radio frequency identification function. In the actual use process, the portable electronic device can be a portable electronic device carried by a user such as a mobile phone and a PDA or a main processing device which can further process signals read by a radio frequency interpreter, and the portable electronic device or the main processing device has a radio frequency identification function and a radio frequency identification function at the same time. In practical use, the read-write function of the wireless radio frequency reader-writer is respectively the same as the functions and the realization principle of the wireless radio frequency identification chip and the wireless radio frequency electronic tag chip.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An antenna, comprising:

the antenna comprises a first dielectric substrate (10), wherein a radiating metal patch (20) is arranged on the upper surface of the first dielectric substrate (10), and a grounding metal sheet (30) is arranged on the lower surface of the first dielectric substrate;

the second dielectric substrate (40), the said second dielectric substrate (40) locates under the said grounded metal sheet (30), there are first signal separation circuit (41) and second signal separation circuit (42) on the said second dielectric substrate (40);

the radiating metal patch (20) is provided with a radio frequency feed point (21) and a touch feed point (22), the radio frequency feed point (21) is connected with the microwave signal processor (100) through the first signal separation circuit (41), and the touch feed point (22) is connected with the touch signal processor (200) through the second signal separation circuit (42).

2. An antenna according to claim 1, characterized in that the first signal splitting circuit (41) comprises a capacitor (411) and a microwave antenna feed (412) connected to each other, the radio frequency feed (21) being connected to the capacitor (411), the microwave antenna feed (412) being for connection to a microwave signal processor (100);

the capacitor (411) is used for blocking low-frequency signals and passing high-frequency signals.

3. An antenna according to claim 2, characterized in that the capacitor (411) is a high frequency capacitance or a distributed coupling capacitance.

4. The antenna of claim 1, wherein when the touch feed point (22) is located in the middle of the radiating metal patch (20), the second signal splitting circuit (42) comprises a touch feed line (421), and both ends of the touch feed line (421) are respectively connected with the touch feed point (22) and the touch signal processor (200);

the middle position of the radiating metal patch (20) is a virtual place which is used for blocking high-frequency signals and passing low-frequency signals.

5. The antenna of claim 1, wherein the second signal splitting circuit (42) comprises an inductor (422) and a touch feed line (421) connected to each other when the touch feed point (22) is located at the middle of the radiating metal patch (20), the touch feed point (22) is connected to the inductor (422), and the touch feed line (421) is used for connecting to a touch signal processor (200);

the middle position of the radiating metal patch (20) is a virtual place, and the virtual place and the inductor (422) are used for blocking high-frequency signals and passing low-frequency signals.

6. The antenna of claim 1, wherein the touch feed point (22) is located at a non-central position of the radiating metal patch (20), the second signal splitting circuit (42) comprises an inductor (422) and a touch feed line (421) which are connected with each other, the touch feed point (22) is connected with the inductor (422), and the touch feed line (421) is used for connecting with a touch signal processor (200);

the inductor (422) is used for blocking high-frequency signals and passing low-frequency signals.

7. An antenna according to claim 5 or 6, characterized in that the inductor (422) is a high frequency blocking inductor or an equivalent inductor of a high impedance transmission line.

8. The antenna according to any of claims 1-6, characterized in that the radiating metal patch (20) is in the shape of any of a rectangle, a circle and a polygon.

9. The antenna according to claim 8, characterized in that the microwave signal processor (100) is a radar receiver or transmitter;

the touch signal processor (200) is a single chip microcomputer or a DSP or an FPGA.

10. An electronic device, characterized in that it comprises an antenna according to any of claims 1-9.