CN111799555A - Harmonic suppression antenna and microwave detection device with harmonic suppression antenna - Google Patents

Abstract

The invention provides a harmonic suppression antenna and a microwave detection device with the harmonic suppression antenna, wherein the harmonic suppression antenna is suitable for a signal processing module, and the signal processing module is provided with an excitation signal source. The harmonic suppression antenna comprises a dual-coupling dipole antenna and a harmonic suppression unit, wherein the dual-coupling dipole antenna comprises a first antenna element and a second antenna element, the first antenna element is adjacently and spacedly arranged on the second antenna element, and the first antenna element and the second antenna element are fed by the same source, so that the first antenna element is dually coupled with the second antenna element.

Description

Harmonic Suppression Antenna and Microwave Detection Device with Harmonic Suppression Antenna

technical field

The invention relates to the field of microwave detection, in particular to a harmonic suppression antenna and a microwave detection device with a harmonic suppression antenna.

Background technique

With the development of Internet of Things technology and 5G high-speed communication, artificial intelligence, smart home, and smart security technologies have higher and higher requirements for environmental detection, especially the detection accuracy of human presence, movement and fretting action characteristics. Only by obtaining a sufficiently stable detection result can an accurate judgment basis be provided for the intelligent terminal device. Microwave detection technology based on the principle of Doppler effect has unique advantages in behavior detection and presence detection technology as an important hub connecting people and objects and objects. It can extract the characteristic information of objects, so it has a wide range of application prospects.

As the basic equipment in the field of microwave detection, microwave detection antennas can transmit and receive microwave signals in specific frequency bands. The definition and licensing of different frequency bands can regulate the frequency bands used by radios and reduce the probability of mutual interference between radio devices in different frequency bands. The problem of mutual interference between radios in adjacent or in the same frequency band is increasing. The accuracy of microwave detection antennas transmitting and receiving signals will directly affect the detection accuracy. Radio technology is also the hub of information transmission in the field of communication, and its anti-interference ability is related to economy and national defense security.

The microwave detector based on the principle of Doppler effect can be used to detect the activities of living bodies such as people or animals, wherein the microwave detector transmits and receives microwave signals in a specific frequency band, and uses the principle of the Doppler effect to obtain the corresponding The Doppler intermediate frequency signal of the living body. The main factors affecting the detection accuracy of microwave detectors are the harmonic signals generated and received by the microwave antenna and the detection dead zone generated by the antenna itself. First of all, the feedback of the harmonic signal generated by the microwave detector to the human activity is not complete and accurate, and as the electromagnetic environment becomes more complex, the integrity and accuracy of the current microwave detector's feedback to the human activity are further affected. limit. On the other hand, the antenna structure of the microwave detector is mainly divided into a microwave detection module with a cylindrical radiation source structure and a microwave detection module with a flat radiation source structure.

SUMMARY OF THE INVENTION

One of the main advantages of the present invention is to provide a harmonic suppression antenna and a microwave detection device with a harmonic suppression antenna, wherein the harmonic suppression antenna reduces the transmitted and received harmonic signals, which is beneficial to improve the microwave detection The detection accuracy of the device.

Another advantage of the present invention is to provide a harmonic suppression antenna and a microwave detection device with a harmonic suppression antenna, wherein the harmonic suppression antenna adopts a dual coupling manner to have a relatively high radiation gain, and can avoid the formation of Detect dead zone.

Another advantage of the present invention is to provide a harmonic suppression antenna and a microwave detection device with a harmonic suppression antenna, wherein the microwave detection device obtains a fluctuating signal based on microwave signals transmitted and received by the harmonic suppression antenna, The wave signal corresponds to the motion characteristics of objects in the environment, so that the microwave detection device detects the moving objects in the environment.

Another advantage of the present invention is to provide a harmonic suppression antenna and a microwave detection device with a harmonic suppression antenna, wherein the fluctuation signal obtained by the microwave detection device corresponds to the activity characteristics of a living body (animal or human) in the environment , which is beneficial for the microwave detection device to detect the activity characteristics of the living body in the environment.

Another advantage of the present invention is to provide a harmonic suppression antenna and a microwave detection device with a harmonic suppression antenna, wherein the harmonic suppression antenna reduces the interference of electromagnetic radiation in the environment to the fluctuating signal, which is beneficial to The detection accuracy of the motion of the object in the detection space by the anti-interference microwave detection module is improved.

Another advantage of the present invention is to provide a harmonic suppression antenna and a microwave detection device with a harmonic suppression antenna, wherein the harmonic suppression antenna facilitates the microwave by reducing the harmonics of transmitted and received microwave signals The detection device obtains the tiny motion characteristics corresponding to the living body, such as movement, micro-motion, breathing and heartbeat.

Another advantage of the present invention is to provide a harmonic suppression antenna and a microwave detection device with a harmonic suppression antenna, wherein the harmonic suppression antenna includes a harmonic suppression unit and a pair of dipole antennas, wherein the harmonic suppression antenna The wave suppression network is electrically connected to the pair of dipole antennas, whereby the harmonic suppression network reduces the interference of electromagnetic radiation in the environment to the fluctuating signal, so as to help improve the feedback of the fluctuating signal to human activity. accuracy.

Another advantage of the present invention is to provide a harmonic suppression antenna and a microwave detection device with a harmonic suppression antenna, wherein the harmonic suppression unit of the harmonic suppression antenna allows signals in a specific frequency range to pass through, so as to reduce radiation The externally transmitted harmonic signals and the received noise signals in the environment are beneficial to improve the detection accuracy of the microwave detection device.

Other advantages and features of the invention will be fully realized from the following detailed description and may be realized by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to one aspect of the present invention, the first harmonic suppression antenna of the present invention capable of achieving the foregoing objects and other objects and advantages includes:

A pair of dicoupled pole antennas, wherein the pair of dicoupled pole antennas includes a first antenna element and a second antenna element, the first antenna element is disposed adjacent to and spaced from the second antenna element, the the first antenna element and the second antenna element are co-fed such that the first antenna element is dually coupled to the second antenna element; and

A harmonic suppression unit, wherein the harmonic suppression unit includes at least one equivalent capacitance and at least one equivalent inductance, and the equivalent capacitance and the equivalent inductance are electrically connected to all of the pair of dicoupled pole antennas. the first antenna unit, whereby the harmonic suppression unit is electrically connected to the feed stage of an excitation signal source, and the second antenna unit is electrically connected to the ground pole of the excitation signal source.

According to an embodiment of the present invention, the equivalent capacitance and the equivalent inductance of the harmonic suppression unit form a frequency selection network, and the frequency selection network has a specific frequency including the frequency of the excitation signal. The electrical signal of the interval has a selective characteristic.

According to an embodiment of the present invention, the first antenna unit is grounded through at least one of the equivalent inductances of the harmonic suppression unit.

According to an embodiment of the present invention, wherein at least one of the equivalent inductances that ground the first antenna element is set as a microstrip line.

According to an embodiment of the present invention, wherein at least one of the equivalent inductances that ground the first antenna element is set as a resistive element.

According to an embodiment of the present invention, the equivalent capacitor further includes a first capacitor unit, a second capacitor unit, a third capacitor unit and a fourth capacitor unit, and the equivalent inductance further includes a first inductor unit, a second inductance unit, and a third inductance unit, wherein the first capacitance unit and the first inductance unit are electrically connected to the first antenna unit of the pair of dicoupled pole antennas, and the The first antenna unit is grounded through the first inductance unit, the second inductance unit and the third inductance unit are connected in series with the first inductance unit and the signal processing module, and the equivalent capacitance of the The second capacitor unit, the third capacitor unit and the fourth capacitor unit are connected in parallel with the first inductor unit, and the second capacitor unit, the third capacitor unit and the fourth capacitor unit are grounded .

According to an embodiment of the present invention, the second capacitor unit is connected in series with the first capacitor unit, and is grounded through the second capacitor unit, and the third capacitor unit is connected to the first capacitor unit and the first capacitor unit. Two inductance units are connected in series and grounded through the third capacitance unit, and the fourth capacitance unit is connected in series with the first capacitance unit, the second inductance unit and the third inductance unit, and is connected to the ground through the fourth capacitance unit The capacitor unit is grounded.

According to an embodiment of the present invention, the first capacitance unit of the equivalent capacitance of the harmonic suppression unit is implemented as a capacitance element, the second capacitance unit of the equivalent capacitance, the first capacitance unit of the equivalent capacitance The three capacitor units and the fourth capacitor element are microstrip lines formed on the circuit substrate.

According to an embodiment of the present invention, the first capacitance unit, the third capacitance unit and the fourth capacitance element of the equivalent capacitance of the harmonic suppression unit are implemented as a capacitance element, and the The second capacitance unit of equivalent capacitance is implemented as a microstrip line formed on the circuit substrate.

According to an embodiment of the present invention, the first antenna element and the second antenna element of the dicoupled pole antenna are arranged axially symmetrically, and the distance between the second antenna element and the first antenna element is The separation distance is greater than or equal to the line length of λ/16, where λ is the wavelength parameter corresponding to the frequency of the feed signal.

According to an embodiment of the present invention, the first antenna element and the second antenna element of the dicoupled pole antenna are arranged axially symmetrically, and the distance between the second antenna element and the first antenna element is The separation distance is greater than or equal to the line length of λ/32, where λ is the wavelength parameter corresponding to the frequency of the feed signal.

According to an embodiment of the present invention, the first antenna element and the second antenna element of the dicoupled pole antenna are arranged axially symmetrically, and the distance between the second antenna element and the first antenna element is The separation distance is greater than or equal to the line length of λ/128, where λ is the wavelength parameter corresponding to the frequency of the feed signal.

According to an embodiment of the present invention, the dual-coupled pole antenna further includes a circuit substrate, the first antenna unit and the second antenna unit are fixed to the circuit substrate, and the harmonic suppression unit is provided on the circuit board, and the second antenna unit is grounded on the circuit board.

According to an embodiment of the present invention, it further includes an electromagnetic reflection unit disposed on the circuit substrate, and the electromagnetic reflection unit and the harmonic suppression unit are disposed back-to-back based on the circuit substrate.

According to an embodiment of the present invention, it further includes an antenna holder, wherein the first antenna unit and the second antenna unit are fixed to the circuit substrate by the antenna holder.

According to an embodiment of the present invention, the first antenna unit further includes a first feed end and a first mounting end integrally extending from the first feed end, wherein the first feed end passes through the The first mounting end is mounted on the circuit substrate, and the end of the first mounting end is electrically connected to the harmonic suppression unit, and the second antenna unit further includes a second feeding end and a self- A second mounting end integrally extending from the second feeding end, wherein the second mounting end is mounted on the circuit substrate.

According to another aspect of the present invention, the present invention further provides a microwave detection device suitable for detecting the movement characteristics of an object, comprising:

a signal processing module; and

A harmonic suppression antenna, wherein the harmonic suppression antenna is electrically connected to the signal processing module, the harmonic suppression antenna is excited by the signal processing module to emit a detection microwave to a detection space, and the harmonic suppression antenna is The wave suppression antenna receives the echoes of the detected microwaves, and the signal processing module obtains a wave signal according to the microwave signal transmitted and received by the harmonic wave suppression antenna, and the wave signal is used to characterize the movement characteristics of the object. The harmonic suppression antenna further includes:

A pair of dicoupled pole antennas, wherein the pair of dicoupled pole antennas includes a first antenna element and a second antenna element, the first antenna element is disposed adjacent to and spaced from the second antenna element, the the first antenna element and the second antenna element are co-fed such that the first antenna element is dually coupled to the second antenna element; and

A harmonic suppression unit, wherein the harmonic suppression unit includes at least one equivalent capacitance and at least one equivalent inductance, and the equivalent capacitance and the equivalent inductance are electrically connected to all of the pair of dicoupled pole antennas. the first antenna unit, whereby the harmonic suppression unit is electrically connected to the feed stage of an excitation signal source, and the second antenna unit is electrically connected to the ground pole of the excitation signal source.

According to an embodiment of the present invention, wherein the signal processing module includes an oscillation circuit, a frequency mixing detection unit and a signal conversion unit, wherein the oscillation circuit is respectively connected with the frequency mixing detection unit and the harmonic wave Suppressing the electrical coupling of the antenna, the oscillation circuit provides an excitation signal to the frequency mixing and detection unit and the harmonic suppression antenna as the excitation signal source, and the frequency mixing and detection unit processes the signal according to the Doppler effect principle Harmonic suppression antennas transmit and receive signals to obtain a Doppler signal, wherein the signal conversion unit characterizes the Doppler signal to obtain the wave signal corresponding to the object, whereby the wave signal The fluctuations in the corresponding to the motion of the object in the detection space.

According to an embodiment of the present invention, the signal processing module further includes an amplifying unit, the amplifying unit is electrically connected to the frequency mixing and detecting unit and the signal converting unit, whereby the amplifying unit amplifies the mixing frequency the Doppler signal obtained by the detection unit.

According to an embodiment of the present invention, the signal processing module is selected from a chip group consisting of microwave chips or radio frequency chips.

According to an embodiment of the present invention, the at least one equivalent capacitance and the at least one equivalent inductance of the harmonic suppression unit form a frequency selection network, and the frequency selection network has an effect on the frequency including the excitation signal. The electrical signal in the specific frequency range has a selective characteristic.

According to an embodiment of the present invention, the first antenna unit is grounded through at least one of the equivalent inductances of the harmonic suppression unit.

According to an embodiment of the present invention, wherein at least one of the equivalent inductances that ground the first antenna element is set as a microstrip line.

According to an embodiment of the present invention, wherein at least one of the equivalent inductances that ground the first antenna element is set as a resistive element.

According to an embodiment of the present invention, the equivalent capacitor further includes a first capacitor unit, a second capacitor unit, a third capacitor unit and a fourth capacitor unit, and the equivalent inductance further includes a first inductor unit, a second inductance unit, and a third inductance unit, wherein the first capacitance unit and the first inductance unit are electrically connected to the first antenna unit of the pair of dicoupled pole antennas, and the The first antenna unit is grounded through the first inductance unit, the second inductance unit and the third inductance unit are connected in series with the first inductance unit and the signal processing module, and the equivalent capacitance of the The second capacitor unit, the third capacitor unit and the fourth capacitor unit are connected in parallel with the first inductor unit, and the second capacitor unit, the third capacitor unit and the fourth capacitor unit are grounded .

According to an embodiment of the present invention, the second capacitor unit is connected in series with the first capacitor unit, and is grounded through the second capacitor unit, and the third capacitor unit is connected to the first capacitor unit and the first capacitor unit. Two inductance units are connected in series and grounded through the third capacitance unit, and the fourth capacitance unit is connected in series with the first capacitance unit, the second inductance unit and the third inductance unit, and is connected to the ground through the fourth capacitance unit The capacitor unit is grounded.

According to an embodiment of the present invention, the first capacitance unit of the equivalent capacitance of the harmonic suppression unit is implemented as a capacitance element, the second capacitance unit of the equivalent capacitance, the first capacitance unit of the equivalent capacitance The three capacitor units and the fourth capacitor element are microstrip lines formed on the circuit substrate.

According to an embodiment of the present invention, the first capacitance unit, the third capacitance unit and the fourth capacitance element of the equivalent capacitance of the harmonic suppression unit are implemented as a capacitance element, and the The second capacitance unit of equivalent capacitance is implemented as a microstrip line formed on the circuit substrate.

According to an embodiment of the present invention, the first antenna element and the second antenna element of the dicoupled pole antenna are arranged axially symmetrically, and the distance between the second antenna element and the first antenna element is The separation distance is greater than or equal to the line length of λ/16, where λ is the wavelength parameter corresponding to the frequency of the feed signal.

According to an embodiment of the present invention, the first antenna element and the second antenna element of the dicoupled pole antenna are arranged axially symmetrically, and the distance between the second antenna element and the first antenna element is The separation distance is greater than or equal to the line length of λ/32, where λ is the wavelength parameter corresponding to the frequency of the feed signal.

According to an embodiment of the present invention, the first antenna element and the second antenna element of the dicoupled pole antenna are arranged axially symmetrically, and the distance between the second antenna element and the first antenna element is The separation distance is greater than or equal to the line length of λ/128, where λ is the wavelength parameter corresponding to the frequency of the feed signal.

According to an embodiment of the present invention, the dual-coupled pole antenna further includes a circuit substrate, the first antenna unit and the second antenna unit are fixed to the circuit substrate, and the harmonic suppression unit is provided on the circuit board, and the second antenna unit is grounded on the circuit board.

According to an embodiment of the present invention, it further includes an electromagnetic reflection unit disposed on the circuit substrate, and the electromagnetic reflection unit and the harmonic suppression unit are disposed back-to-back based on the circuit substrate.

According to an embodiment of the present invention, it further includes an antenna holder, wherein the first antenna unit and the second antenna unit are fixed to the circuit substrate by the antenna holder.

According to an embodiment of the present invention, the first antenna unit further includes a first feed end and a first mounting end integrally extending from the first feed end, wherein the first feed end passes through the The first mounting end is mounted on the circuit substrate, and the end of the first mounting end is electrically connected to the harmonic suppression unit, and the second antenna unit further includes a second feeding end and a self- A second mounting end integrally extending from the second feeding end, wherein the second mounting end is mounted on the circuit substrate. Further objects and advantages of the present invention will be fully realized by an understanding of the ensuing description and drawings.

These and other objects, features and advantages of the present invention are fully embodied by the following detailed description, drawings and claims.

Description of drawings

FIG. 1 is a schematic frame diagram of a microwave detection device according to a first preferred embodiment of the present invention.

2 is a schematic diagram of an analog circuit of a harmonic suppression antenna of the microwave detection device according to the above preferred embodiment of the present invention.

3 is a schematic diagram of the overall structure of the harmonic suppression antenna of the microwave detection device according to the above preferred embodiment of the present invention.

4A and 4B are schematic diagrams of the specific structure of the harmonic suppression antenna of the microwave detection device according to the above preferred embodiment of the present invention.

5 is a schematic diagram of a harmonic suppression unit of the harmonic suppression antenna of the microwave detection device according to the above preferred embodiment of the present invention.

6 is a cross-sectional view of the harmonic suppression antenna of the microwave detection device according to the above preferred embodiment of the present invention.

7 is a schematic diagram of another optional implementation manner of a first harmonic suppression unit of the harmonic suppression antenna of the microwave detection device according to the above preferred embodiment of the present invention.

8 is a schematic diagram of an analog circuit of another harmonic suppression antenna of the microwave detection device according to the above preferred embodiment of the present invention.

Detailed ways

The following description serves to disclose the invention to enable those skilled in the art to practice the invention. The preferred embodiments described below are given by way of example only, and other obvious modifications will occur to those skilled in the art. The basic principles of the invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It should be understood by those skilled in the art that in the disclosure of the present invention, the terms "portrait", "horizontal", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and to simplify the description, rather than to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus the above terms should not be construed as limiting the invention.

It should be understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be one. The number may be plural, and the term "one" should not be understood as a limitation on the number.

Referring to the accompanying drawings of the present invention as shown in FIGS. 1 to 6 , a microwave detection apparatus according to the first preferred embodiment of the present invention is explained in the following description. The microwave detection device includes a signal processing module 10 and a harmonic suppression antenna 20 electrically connected to the signal processing module 10, wherein the signal processing module 10 sends a microwave excitation signal to the harmonic suppression antenna 20, Under the excitation of the signal processing module 10, the harmonic suppression antenna 20 sends out a microwave detection signal of a specific frequency. The microwave suppression antenna 20 transmits the microwave detection signal under the excitation of the signal processing module 10, and receives an echo signal of the microwave detection signal reflected by the detected object in the environment, wherein the harmonic suppression antenna 20 The received echo signal is transmitted to the signal processing module 10, and the signal processing module 10 is based on Doppler based on the difference between the microwave probe signal and the echo signal transmitted by the harmonic suppression antenna. A Doppler signal corresponding to the detected object is obtained by the principle of the Ler effect. Those skilled in the art can understand that the Doppler signal obtained by the signal processing module 10 can be obtained based on the frequency difference/phase difference between the microwave detection signal and the echo signal, then the The frequency of the Puller signal corresponds to the velocity of the detected object in the direction of connection with the harmonic suppression antenna 20 . The signal processing module 10 obtains a fluctuation signal corresponding to the activity of the detected object based on the trend processing of the Doppler signal, that is, the microwave detection device processes the Doppler signal by trending The fluctuation signal is obtained, so that the characteristics of each fluctuation in the fluctuation signal can be used to characterize the motion characteristics of the corresponding motion of the detected object.

Preferably, in this preferred embodiment of the present invention, the signal processing module 10 of the microwave detection device trends the Doppler signal according to the change of the frequency of the Doppler signal over time, so as to obtain the Doppler signal. The fluctuation signal is obtained, for example, the Doppler signal is trended at the same time in a filtering manner with integral characteristics to obtain the fluctuation signal corresponding to the change of the frequency of the Doppler signal with time, and the wave is selected to be output. The fluctuation of a specific frequency in the signal, whereby the corresponding relationship between the frequency of the fluctuating signal and the frequency of the corresponding action characterizes the activity or movement characteristics of a living body such as a human or an animal. As an example, in this preferred embodiment of the present invention, when the frequency of the wave signal obtained after the low-pass filtering process by the signal processing module 10 of the microwave detection device is lower than 25Hz, the frequency of the wave signal is 3Hz. The fluctuation signals above and above correspond to the micro-movements of the human body, such as walking, swinging arms, etc.; when the signal processing module 10 low-pass filtering and processing, the fluctuation signals with a frequency between 1Hz and 3Hz correspond to the fluctuation signals. According to the heartbeat action of the human body; when the signal processing module 10 low-pass filtering and processing, the fluctuation signal of the fluctuation signal at 1 Hz and below corresponds to the breathing action of the human body. In other words, in this preferred embodiment of the present invention, the signal processing module 10 of the microwave detection device characterizes the Doppler signal according to the activity characteristics of the human body, so as to obtain the Doppler signal corresponding to the specific activity of the human body. A heartbeat, whereby the heartbeat is indicative of human activity.

It is worth mentioning that, in the preferred embodiment of the present invention, the signal processing module 10 is implemented in the form of discrete components, wherein the signal processing module 10 includes an oscillation circuit 11, a frequency mixing detection unit 12, and a signal conversion unit 13, wherein the oscillator circuit 11 is electrically coupled with the frequency mixing and detection unit 12 and the harmonic suppression antenna 20, respectively, and is configured to generate an excitation signal for a microwave signal, and the oscillator circuit 11 provides the The excitation signal is sent to the frequency mixing detection unit 12 and the harmonic suppression antenna 20 . The harmonic suppression antenna 20 emits a microwave detection signal of the same frequency as the excitation signal under the excitation action of the excitation signal. The frequency mixing detection unit 12 is electrically connected to the harmonic suppression antenna 20, and the frequency mixing detection unit 12 obtains the signal transmitted and received by the frequency mixing detection unit 12 according to the Doppler effect principle and the harmonic suppression antenna. Doppler signal. The signal conversion unit 13 is electrically connected to the frequency mixing and detection unit 12, wherein the signal conversion unit 13 is configured to process the Doppler signal in a trend based on the frequency of the Doppler signal over time , so as to obtain the wave signal corresponding to the detected object, whereby the wave frequency in the wave signal corresponds to the frequency of the movement of the object in the detection space.

The signal processing module 10 further includes an amplifying unit 14, wherein the amplifying unit 14 is electrically connected between the frequency mixing and detecting unit 12 and the signal converting unit 13, and the amplifying unit 14 is adapted to amplify the The Doppler signal obtained by the frequency mixing and detection unit 12 is beneficial to the processing by the signal conversion unit 13 .

As shown in FIG. 2 and FIG. 3 , the harmonic suppression antenna 20 includes a harmonic suppression unit 21 and a pair of dicoupled pole antennas 22, wherein the harmonic suppression unit 21 is electrically connected to the pair of dicoupled poles The antenna 22 , the pair of dipole antennas 22 is electrically connected to the signal processing module 10 through the harmonic suppression unit 21 . The excitation signal of the signal processing module 10 is transmitted to the pair of dipole antennas 22 through the harmonic suppression unit 21 to excite the pair of dipole antennas 22 to send out a wireless detection signal with the same frequency as the excitation signal . The dual coupled pole antenna 22 is also configured to receive microwave signals in the environment, wherein the microwave signal received by the dual coupled pole antenna 22 is filtered by the harmonic suppression unit, whereby the harmonic suppression unit 21 The noise signal in the microwave signal is filtered to prevent the noise signal from affecting the detection structure of the microwave detection device. The harmonic suppression unit 21 of the harmonic suppression antenna 20 selectively selects the echo signal received by the dicoupled pole antenna 22 in a frequency-selective manner, whereby the signal processing module 10 The frequency mixing detection unit 12 frequency mixing and detecting the excitation signal and the echo signal to obtain a corresponding Doppler signal.

As shown in FIG. 2 , the pair of dipole antennas 22 includes a first antenna unit 221 and a second antenna unit 222, wherein the first antenna unit 221 is electrically connected to the harmonic suppression unit 21, so The second antenna element 222 and the first antenna element 221 are fed in a homologous manner, and the second antenna element 222 is grounded, and the second antenna element 222 is disposed adjacent to the first antenna element 221. The antenna unit 221, and the first antenna unit 221 and the second antenna unit 222 are arranged to be spaced apart from each other. Therefore, when the first antenna element 221 and the second antenna element 222 of the paired dipole antenna 22 are fed by the same source, the first antenna element 221 of the paired dipole antenna 22 A dual coupling mode is formed with the second antenna unit 222 .

The harmonic suppression unit 21 includes at least one equivalent capacitance 211 and at least one equivalent inductance 212 , wherein the equivalent capacitance 211 is electrically connected to the first antenna unit 221 of the dipole antenna 22 and the first antenna unit 221 . The frequency mixing and detection unit 12 of the signal processing module 10 . The equivalent inductance 212 is electrically connected to the first antenna element 221 of the pair of dipole antennas 22, and the first antenna element 221 is grounded through the equivalent inductance 212. The equivalent capacitance 211 and the equivalent inductance 212 of the harmonic suppression unit 21 form a frequency selection network, wherein the frequency selection network is a circuit that selectively allows electrical signals in a specific frequency range to pass through. The specific frequency range is a frequency range that contains the excitation signal, for example, the electrical signal in the specific frequency range is selectively allowed by the high impedance characteristic of the electrical signal deviating from the frequency of the excitation signal in all or part of the frequency range By selectively allowing the electrical signal in the specific frequency interval to pass through, or by selectively allowing the electrical signal in the specific frequency interval to pass through the low-impedance attenuation to the ground of the electrical signal deviating from the frequency of the excitation signal in all or part of the frequency interval, so as to form the frequency selective network pair including the Selecting characteristics of the electrical signal in the specific frequency interval of the frequency of the excitation signal. Correspondingly, the frequency selection network formed by the harmonic suppression unit 21 can prevent other signals other than the specific frequency from passing through, so as to prevent the reception of noise signals in other frequency bands.

In short, the present invention can be implemented as a resonant tank, or at least a filter, through the harmonic suppression unit 21, and the harmonic suppression unit 21 selectively allows the electrical signals in the specific frequency range to pass through the A frequency selection network, based on the selection characteristics of the frequency selection network for electrical signals in the specific frequency range, from the dual-coupled pole antenna 22 to select the frequency to transmit the echo signal to the frequency mixing and detection unit 12 .

It is worth mentioning that, in this preferred embodiment of the present invention, the equivalent capacitance 211 and the equivalent inductance 212 of the harmonic suppression unit 21 are high-frequency currents corresponding to the frequency of the excitation signal The components or microstrip lines exhibiting capacitive and inductive characteristics, respectively. The equivalent capacitor 211 is a component that has capacitance characteristics and is equivalent to a capacitor under a high-frequency current corresponding to the frequency of the excitation signal, such as a microstrip line or a high-frequency capacitor spaced apart from each other. The equivalent inductance 212 is a component that has inductance characteristics and is equivalent to an inductance under a high-frequency current corresponding to the frequency of the excitation signal, such as an inductance, a microstrip line or a resistance. Preferably, in this preferred embodiment of the present invention, the equivalent capacitance 211 and the equivalent inductance 212 of the harmonic suppression unit 21 are implemented as microstrips etched on the pair of dicoupled pole antennas 22 Wire.

As shown in FIG. 2 , the equivalent capacitor 211 of the harmonic suppression unit 21 further includes a first capacitor unit 2111 , a second capacitor unit 2112 , a third capacitor unit 2113 and a fourth capacitor unit 2114 . The equivalent inductor 212 further includes a first inductor unit 2121, a second inductor unit 2122, and a third inductor unit 2123, wherein the first capacitor unit 2111 and the first inductor unit 2121 are electrically connected to The first antenna element 221 of the pair of dipole antennas 22 is coupled, and the first inductance element 2121 is grounded to the first antenna element 221 of the pair of the pair of pole antennas 22 . The second inductance unit 2122 and the third inductance unit 2123 are connected in series between the first inductance unit 2111 and the signal processing module 10 . The second capacitor unit 2112, the third capacitor unit 2113, and the fourth capacitor unit 2114 of the equivalent capacitor 211 are connected in parallel with the first inductor unit 2121, and the second capacitor unit 2112, the The third capacitor unit 2113 and the fourth capacitor unit 2114 are grounded respectively. Specifically, the second capacitor unit 2112 is connected in series with the first capacitor unit 2111 and is grounded through the second capacitor unit 2112 . The third capacitor unit 2113 is connected in series with the first capacitor unit 2111 and the second inductance unit 2122 , and is grounded through the third capacitor unit 2113 . The fourth capacitor unit 2114 is connected in series with the first capacitor unit 2111 , the second inductor unit 2122 and the third inductor unit 2123 , and is grounded through the fourth capacitor unit 2114 .

It is worth mentioning that, in this preferred embodiment of the present invention, the equivalent capacitance 211 and the equivalent inductance 212 of the harmonic suppression unit 21 are based on The frequency characteristic of the microwave detection signal satisfies a specific impedance matching relationship.

As shown in FIGS. 3 to 4B , the first antenna element 221 and the second antenna element 222 of the dicoupled pole antenna 22 are arranged in an axisymmetric manner, and the paired pole antenna 22 The first antenna unit 221 and the second antenna unit 222 are fed by the same source, and when the first antenna unit 221 and the second antenna unit 222 are fed by the same source, the first antenna unit 221 and the second antenna unit 222 are fed by the same source. The antenna unit 221 is correspondingly coupled to the second antenna unit 222 . The first antenna unit 221 and the second antenna unit 222 of the dual-coupled pole antenna 22 are fed by the same source, so that the second antenna unit 222 and the first antenna unit 221 can generate electricity. The size requirements of the coupling are reduced. Exemplarily, the separation distance between the second antenna unit 222 and the first antenna unit 221 is greater than or equal to the line length of λ/16, where λ is a wavelength parameter corresponding to the frequency of the feed signal.

Further, the first antenna unit 221 and the second antenna unit 222 are arranged adjacent to each other, wherein the distance between the first antenna unit 221 and the second antenna unit 222 is less than or equal to λ/32 , so that when the first antenna unit 221 and the second antenna unit 222 are respectively fed by the same source, the first antenna unit 221 and the second antenna unit 222 can be coupled to each other. Preferably, the distance between the first antenna unit 221 and the second antenna unit 222 tends to λ/128, so that the first antenna unit 221 and the second antenna unit 222 are When the antenna element 221 and the second antenna element 222 are fed by the same source, the mutual coupling loss between the first antenna element 221 and the second antenna element 222 can be reduced and the pair of coupling poles can be correspondingly increased. The gain of the sub-antenna 22.

In this preferred embodiment of the present invention, the first antenna unit 221 and the second antenna unit 222 are respectively fed and connected to different poles of the same excitation signal source and fed by the same source. In this preferred embodiment of the present invention, the first antenna unit 221 is electrically connected to the signal processing module 10 through the harmonic suppression unit 21 , and the feed end of the second antenna unit 222 is grounded. In other words, the first antenna unit 221 is electrically connected to the feed of the excitation signal source of the wireless detection signal, the second antenna unit 222 is electrically connected to the ground pole of the excitation signal source of the wireless detection signal, and the same source as the first antenna unit is fed by the excitation signal.

When the first antenna element 221 and the second antenna element 222 of the dual coupled pole antenna 22 are fed by the same source, the first antenna element 221 is correspondingly coupled to the second antenna element 222, And a detection space 201 is formed along the direction corresponding to the first antenna unit 221 and the second antenna unit 222, wherein the coverage area of the electromagnetic wave radiated by the dicoupled pole antenna 22, that is, it can transmit wireless detection. range of the signal.

As shown in FIG. 3 to FIG. 4B , the dual-coupled pole antenna 22 further includes a circuit substrate 223 , wherein the harmonic suppression unit 21 of the harmonic suppression antenna 20 is disposed on the dual-coupled pole antenna The circuit board 223 of 22, or the harmonic suppression unit 21 is formed on the circuit board 223. The first antenna element 221 and the second antenna element 222 of the dipole antenna 22 are fixed to the circuit substrate 223, and the second antenna element 222 is grounded through the circuit substrate 223, so The first antenna unit 221 is electrically connected to the harmonic suppression unit 21 through the circuit substrate 223 .

Preferably, in this preferred embodiment of the present invention, the harmonic suppression unit 21 of the harmonic suppression antenna 20 is formed on the circuit substrate 223 . The circuit substrate 223 is provided with at least two electrical connection holes 2230 , wherein the first antenna element 221 and the second antenna element 222 of the pair of dipole antennas 22 are electrically connected to the electrical connection holes 2230 through the electrical connection holes 2230 . The circuit substrate 223 is described.

In detail, the electrical connection hole 2230 penetrates through the circuit substrate 223 , wherein the first antenna element 221 of the dipole antenna 22 passes through the electrical connection hole 2230 and is electrically connected to the harmonics The equivalent capacitance 211 and the equivalent inductance 212 of the suppression unit 21 are suppressed; wherein the second antenna unit 222 of the dipole antenna 22 is grounded through the electrical connection hole 2230 . In this preferred embodiment of the present invention, the frequency mixing and detection unit 12 of the signal processing module 10 is disposed on the circuit substrate 223 , and the frequency mixing and detection unit 12 is electrically connected to the harmonic suppression unit 21 . coupled to the first antenna unit 221 . When the oscillation circuit 11 is powered as an excitation signal feed source, the first antenna unit 221 and the second antenna unit 222 are fed by the same source from the oscillation circuit 11 to transmit a detection beam and receive the detection beam. An echo of the beam, wherein the echo is received and an echo signal is correspondingly generated.

Those skilled in the art can understand that, when the first antenna unit 221 and the second antenna unit 222 are fed by the same source from the oscillation circuit 11, the first antenna unit 221 and the second antenna unit 222 The potential of 222 and the current are in a dual distribution state, corresponding to the second antenna unit 222 and the first antenna unit 221 being coupled in a dual manner. The degree of correlation between the signal output by the frequency mixing and detection unit 13 and the motion of the corresponding object is improved, so that the corresponding data processing of the pair of dipole antennas can be simplified, thereby helping to reduce the number of pairs of the pair of dipole antennas. 22 cost and improve the stability and accuracy of the dual coupled pole antenna.

The harmonic suppression antenna 20 further includes at least one electromagnetic reflection unit 23, wherein the electromagnetic reflection unit 23 is disposed on the circuit substrate 223 of the dipole antenna 22, so that the electromagnetic reflection unit 23 blocks the The microwave signal emitted by the paired dipole antenna 22 of the harmonic suppression antenna prevents the microwave detection signal emitted by the harmonic suppression antenna from affecting the external environment. The electromagnetic reflection unit 23 is disposed on the circuit substrate 23, wherein the electromagnetic reflection unit 23 is spaced between the pair of dipole antennas 22 and the harmonic suppression unit 21 to avoid the pair of dipoles The microwave detection signal emitted by the antenna 22 interferes with the noise signal of the harmonic suppression network, which is beneficial to improve the working stability and anti-interference performance of the harmonic suppression antenna.

Preferably, in this preferred embodiment of the present invention, the electromagnetic reflection unit 23 of the harmonic suppression antenna 20 and the harmonic suppression unit 21 provided on the circuit substrate 223 are arranged back-to-back.

As shown in FIG. 3 to FIG. 4B , the harmonic suppression antenna 20 further includes an antenna holder 24 , wherein the antenna holder 24 is disposed on the circuit substrate 223 , whereby the antenna holder 24 fixes the antenna The first antenna element 221 and the second antenna element 222 of the dipole antenna 22 are attached to the circuit substrate 223 . The first antenna element 221 and the second antenna element 222 of the dual coupled pole antenna 22 are fixed by the antenna holder 24 and maintain a certain gap, so as to maintain the dual coupled pole antenna during production In-process consistency and in-use stability.

The first antenna unit 221 of the dual-coupled pole antenna 22 further includes a first feed end 2211 and a first mounting end 2212 integrally extending from the first feed end 2211 , wherein the first feed end 2212 The feeding terminal 2211 is electrically connected to the circuit substrate 223 through the first mounting terminal 2212 . The second antenna unit 222 further includes a second feed end 2221 and a second installation end 2222 integrally extending from the second feed end 2221, wherein the second installation end 2222 is electrically connected to the circuit board 223 . The first antenna unit 221 and the second antenna unit 222 are configured to be fed by the same source at the first feed end 2211 and the second feed end 2221, respectively. The first antenna unit 221 is correspondingly coupled from the first feed end 2211 along the first antenna unit 221 to the second antenna unit 222 from the second feed end 2221 along the second antenna The corresponding positions of the unit 222 are formed, thereby forming a dual coupling manner between the first antenna unit 221 and the second antenna unit 222 . The first antenna element 221 and the second antenna element 222 of the dual coupled pole antenna 22 are fed by the same source, and the first feed end 2211 and the second feed end 2221 radiate directionally, The sounding beam is emitted outward to form the sounding space 201 .

The first mounting end 2212 of the first antenna unit 221 and the second mounting end 2222 of the second antenna unit 222 are respectively fixedly mounted on the circuit substrate 223 by the antenna holder 24 , and The antenna holder 24 maintains the distance between the first feeding end 2211 and the second feeding end 2221 by maintaining the first mounting end 2212 and the second mounting end 2222 .

Preferably, in this preferred embodiment of the present invention, the first feed end 2211 of the first antenna unit 221 and the second feed end 2221 of the second antenna unit 222 are rod-shaped, and parallel to the circuit substrate 223 . Optionally, in other optional embodiments of the present invention, the first feed end 2211 of the first antenna unit 221 and the second feed end 2221 of the second antenna unit 222 are in the shape of " L" or inverted "L" type structure, and the first feeding end 2211 and the second feeding end 2221 are axisymmetric based on the first mounting end 2212 and the second mounting end 2222 structure.

It can be understood by those skilled in the art that the first installation end 2212 of the first antenna unit 221 and all the other components are designed according to the distance between the first feeding end 2211 and the second feeding end 2221. the second mounting end 2222 of the second antenna unit 222 . Preferably, in this preferred embodiment of the present invention, the ends of the first mounting end 2212 of the first antenna unit 221 and the second mounting end 2222 of the second antenna unit 222 are electrically connected. on the circuit substrate 223 .

As shown in FIG. 4B , the first mounting end 2212 of the first antenna unit 221 is electrically connected to the harmonic suppression unit 21 through the circuit substrate 223 , and the second mounting end 2212 of the second antenna unit 222 is electrically connected to the harmonic suppression unit 21 . The mounting end 2222 is grounded through the circuit substrate 223 .

As shown in FIG. 5 , in this preferred embodiment of the present invention, the first capacitance unit 2111 of the equivalent capacitance 211 of the harmonic suppression unit 21 is implemented as a capacitance element, and the equivalent capacitance The second capacitor unit 2112 , the third capacitor unit 2113 and the fourth capacitor element 2114 of 211 are microstrip lines formed on the circuit substrate 223 . The first inductance unit 2121 , the second inductance unit 2122 and the third inductance unit 2123 of the equivalent inductance 212 are implemented as microstrip lines formed on the circuit substrate 223 .

FIG. 7 shows another optional implementation of the harmonic suppression unit 21 according to the above preferred embodiment of the present invention, wherein the first capacitance of the equivalent capacitor 211 of the harmonic suppression unit 21 The unit 2111 , the third capacitance unit 2113 and the fourth capacitance element 2114 are implemented as a capacitance element, and the second capacitance unit 2112 of the equivalent capacitance 211 is implemented as a capacitor formed on the circuit substrate 223 . microstrip line. The first inductance unit 2121 , the second inductance unit 2122 and the third inductance unit 2123 of the equivalent inductance 212 are implemented as microstrip lines formed on the circuit substrate 223 .

Referring to FIG. 8 of the accompanying drawings of the present specification, another alternative implementation of the microwave detection device according to the above-mentioned preferred embodiment of the present invention is explained in the following description. The microwave detection device includes a signal processing module 10A and a harmonic suppression antenna 20 electrically connected to the signal processing module 10A, wherein the signal processing module 10A sends a microwave excitation signal to the harmonic suppression antenna 20, Under the excitation of the signal processing module 10A, the harmonic suppression antenna 20 sends out a microwave detection signal of a specific frequency.

It is worth mentioning that, in the preferred embodiment of the present invention, the structure of the harmonic suppression antenna 20 is the same as the above preferred embodiment, the difference lies in the signal processing module 10A, wherein the signal processing module 10A Implemented as a microwave chip or a radio frequency chip, wherein the harmonic suppression antenna 20 is electrically connected to the TX/RX port of the signal processing module 10A.

Those skilled in the art can understand that the signal processing module 10A is configured to have the same function as the signal processing module 10A of the above preferred embodiment, wherein the microwave suppression antenna 20 is located in the signal processing module 10A. The microwave detection signal is sent under the excitation action of the device, and an echo signal of the microwave detection signal reflected by the detected object in the environment is received, wherein the echo signal received by the harmonic suppression antenna 20 is transmitted to the signal Processing module 10A, the signal processing module 10A obtains a signal corresponding to the detected object based on the difference between the microwave detection signal and the echo signal emitted by the harmonic suppression antenna based on the Doppler effect principle. Doppler signal. Those skilled in the art can understand that the Doppler signal obtained by the signal processing module 10A may be based on the difference between signals such as the frequency difference or the amplitude difference between the microwave detection signal and the echo signal get. The signal processing module 10A obtains a fluctuation signal corresponding to the motion of the detected object based on the Doppler signal processing, that is, the microwave detection device processes the Doppler signal in a trending manner according to the motion characteristics of the detected object The wobble signal is obtained from the signal data of , so that the wobble signal can be used to characterize the motion characteristics of the detected object.

It should be understood by those skilled in the art that the embodiments of the present invention shown in the above description and the accompanying drawings are only examples and do not limit the present invention. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the embodiments, and the embodiments of the present invention may be modified or modified in any way without departing from the principles.

Claims (31)

1. A harmonic suppression antenna, characterized in that, comprising: A pair of dicoupled pole antennas, wherein the pair of dicoupled pole antennas includes a first antenna element and a second antenna element, the first antenna element is disposed adjacent to and spaced from the second antenna element, the the first antenna element and the second antenna element are co-fed such that the first antenna element is dually coupled to the second antenna element; and A harmonic suppression unit, wherein the harmonic suppression unit includes at least one equivalent capacitance and at least one equivalent inductance, and the equivalent capacitance and the equivalent inductance are electrically connected to all of the pair of dicoupled pole antennas. the first antenna unit, whereby the harmonic suppression unit is electrically connected to the feed stage of an excitation signal source, and the second antenna unit is electrically connected to the ground pole of the excitation signal source. 2. The harmonic suppression antenna according to claim 1, wherein the equivalent capacitance and the equivalent inductance of the harmonic suppression unit form a frequency selection network, and the pair of frequency selection networks includes the excitation signal The electrical signal of a specific frequency range of the frequency has a selective characteristic. 3. The harmonic suppression antenna of claim 1, wherein the first antenna unit is grounded through at least one of the equivalent inductances of the harmonic suppression unit. 4. The harmonic suppression antenna of claim 3, wherein at least one of the equivalent inductances that ground the first antenna element is set as a microstrip line. 5. The harmonic suppression antenna of claim 3, wherein at least one of the equivalent inductances that ground the first antenna element is set as a resistive element. 6. The harmonic suppression antenna according to any one of claims 1 to 5, wherein the equivalent capacitor further comprises a first capacitor unit, a second capacitor unit, a third capacitor unit and a fourth capacitor unit , the equivalent inductance further includes a first inductance unit, a second inductance unit, and a third inductance unit, wherein the first capacitance unit and the first inductance unit are electrically connected to the pair of coupling poles the first antenna unit of the sub-antenna, and the first antenna unit is grounded through the first inductance unit, the second inductance unit and the third inductance unit are connected in series with the first inductance unit, the The second capacitance unit, the third capacitance unit and the fourth capacitance unit of the equivalent capacitance are connected in parallel with the first inductance unit, and the second capacitance unit, the third capacitance unit and the The fourth capacitive unit is grounded. 7. The harmonic suppression antenna according to claim 6, wherein the second capacitor unit is connected in series with the first capacitor unit, and is grounded through the second capacitor unit, and the third capacitor unit is connected to the first capacitor unit. A capacitor unit is connected in series with the second inductance unit, and is grounded through the third capacitor unit, and the fourth capacitor unit is connected in series with the first capacitor unit, the second inductor unit and the third inductor unit , and is grounded through the fourth capacitor unit. 8. The harmonic suppression antenna according to claim 7, wherein the first capacitance unit of the equivalent capacitance of the harmonic suppression unit is implemented as a capacitance element, and the first capacitance unit of the equivalent capacitance is implemented as a capacitance element. The second capacitor unit, the third capacitor unit and the fourth capacitor element are microstrip lines formed on the circuit substrate. 9. The harmonic suppression antenna according to claim 7, wherein the first capacitance unit, the third capacitance unit, and the fourth capacitance element of the equivalent capacitance of the harmonic suppression unit are implemented Being a capacitive element, the second capacitive unit of the equivalent capacitor is implemented as a microstrip line formed on the circuit substrate. 10. The harmonic suppression antenna according to claim 1, wherein the first antenna element and the second antenna element of the dual coupled pole antenna are arranged axisymmetrically, and the second antenna element and the second antenna element are arranged axially symmetrically. The separation distance between the first antenna elements is less than or equal to the line length of λ/16, where λ is a wavelength parameter corresponding to the frequency of the feed signal. 11. The harmonic suppression antenna of claim 10, wherein the dicoupled pole antenna further comprises a circuit substrate to which the first antenna element and the second antenna element are fixed, and The harmonic suppression unit is provided on the circuit board, and the second antenna unit is grounded on the circuit board. 12 . The harmonic suppression antenna according to claim 11 , further comprising an electromagnetic reflection unit disposed on the circuit substrate, the electromagnetic reflection unit and the harmonic suppression unit being arranged back-to-back based on the circuit substrate. 13 . . 13. The harmonic suppression antenna of claim 12, further comprising an antenna mount, wherein the first antenna unit and the second antenna unit are secured to the circuit substrate by the antenna mount. 14. The harmonic suppression antenna according to claim 13, the first antenna unit further comprising a first feed end and a first mounting end integrally extending from the first feed end, wherein the The first feeding end is mounted on the circuit substrate through the first mounting end, and the end of the first mounting end is electrically connected to the harmonic suppression unit, and the second antenna unit further includes a first Two power feeding terminals and a second mounting terminal integrally extending from the second power feeding terminal, wherein the second mounting terminal is mounted on the circuit substrate. 15. A microwave detection device suitable for detecting the movement characteristics of an object, characterized in that it comprises: a signal processing module; and A harmonic suppression antenna, wherein the harmonic suppression antenna is electrically connected to the signal processing module, the harmonic suppression antenna is excited by the signal processing module to emit a detection microwave to a detection space, and the harmonic suppression antenna is The wave suppression antenna receives the echoes of the detected microwaves, and the signal processing module obtains a wave signal according to the microwave signal transmitted and received by the harmonic wave suppression antenna, and the wave signal is used to characterize the movement characteristics of the object. The harmonic suppression antenna further includes: A pair of dicoupled pole antennas, wherein the pair of dicoupled pole antennas includes a first antenna element and a second antenna element, the first antenna element is disposed adjacent to and spaced from the second antenna element, the the first antenna element and the second antenna element are co-fed such that the first antenna element is dually coupled to the second antenna element; and A harmonic suppression unit, wherein the harmonic suppression unit includes at least one equivalent capacitance and at least one equivalent inductance, and the equivalent capacitance and the equivalent inductance are electrically connected to all of the pair of dicoupled pole antennas. the first antenna unit, whereby the harmonic suppression unit is electrically connected to the feed stage of an excitation signal source, and the second antenna unit is electrically connected to the ground pole of the excitation signal source. 16. The microwave detection device according to claim 15, wherein the signal processing module comprises an oscillation circuit, a frequency mixing detection unit and a signal conversion unit, wherein the oscillation circuit is respectively connected with the frequency mixing detection unit is electrically coupled with the harmonic suppression antenna, the oscillation circuit provides an excitation signal to the mixing detection unit and the harmonic suppression antenna as the excitation signal source, and the mixing detection unit is based on the Doppler signal. The effect principle processes the signal transmitted and received by the harmonic suppression antenna to obtain a Doppler signal, wherein the signal conversion unit characterizes the Doppler signal to obtain the wave signal corresponding to the object, Thereby, the fluctuation in the fluctuation signal corresponds to the action of the object in the detection space. 17. The microwave detection device according to claim 16, wherein the signal processing module further comprises an amplifying unit, the amplifying unit is electrically connected to the frequency mixing and detecting unit and the signal converting unit, whereby the amplifying unit is The unit amplifies the Doppler signal obtained by the frequency mixing and detection unit. 18. The microwave detection device according to claim 15, wherein the signal processing module is selected from a chip group consisting of microwave chips or radio frequency chips. 19. The microwave detection device according to claim 15, wherein the equivalent capacitance and the equivalent inductance of the harmonic suppression unit form a frequency selection network, and the frequency selection network has a The electrical signal of the specific frequency interval of frequencies has a selective characteristic. 20. The microwave detection device of claim 15, wherein the first antenna unit is grounded through at least one of the equivalent inductances of the harmonic suppression unit. 21. The microwave detection device of claim 20, wherein at least one of the equivalent inductances that ground the first antenna element is set as a microstrip line. 22. The microwave detection device of claim 20, wherein at least one of the equivalent inductances that ground the first antenna element is set as a resistive element. 23. The microwave detection device according to any one of claims 15 to 22, wherein the equivalent capacitor further comprises a first capacitor unit, a second capacitor unit, a third capacitor unit and a fourth capacitor unit, The equivalent inductance further includes a first inductance unit, a second inductance unit, and a third inductance unit, wherein the first capacitance unit and the first inductance unit are electrically connected to the pair of coupling poles the first antenna unit of the antenna, and the first antenna unit is grounded through the first inductance unit, the second inductance unit and the third inductance unit are connected in series with the first inductance unit and the signal A processing module, wherein the second capacitor unit, the third capacitor unit and the fourth capacitor unit of the equivalent capacitor are connected in parallel with the first inductance unit, and the second capacitor unit, the third capacitor unit and the third capacitor unit are connected in parallel with the first inductor unit. The capacitor unit and the fourth capacitor unit are grounded. 24. The microwave detection device according to claim 23, wherein the second capacitor unit is connected in series with the first capacitor unit, and is grounded through the second capacitor unit, and the third capacitor unit is connected to the first capacitor unit. The capacitance unit is connected in series with the second inductance unit, and is grounded through the third capacitance unit, and the fourth capacitance unit is connected in series with the first capacitance unit, the second inductance unit and the third inductance unit, and grounded through the fourth capacitor unit. 25. The microwave detection device according to claim 24, wherein the first capacitance unit of the equivalent capacitance of the harmonic suppression unit is implemented as a capacitance element, and the second capacitance of the equivalent capacitance is implemented as a capacitance element. The capacitor unit, the third capacitor unit and the fourth capacitor element are microstrip lines formed on the circuit substrate. 26. The microwave detection device according to claim 24, wherein the first capacitance unit, the third capacitance unit and the fourth capacitance element of the equivalent capacitance of the harmonic suppression unit are implemented as A capacitance element, the second capacitance unit of the equivalent capacitance is implemented as a microstrip line formed on the circuit substrate. 27. The microwave detection apparatus according to claim 15, wherein the first antenna element and the second antenna element of the dicoupled pole antenna are arranged axially symmetrically, and the second antenna element and the The separation distance between the first antenna units is less than or equal to the line length of λ/16, where λ is a wavelength parameter corresponding to the frequency of the feed signal. 28. The microwave detection device according to claim 27, wherein the pair of dipole antennas further comprises a circuit substrate, the first antenna unit and the second antenna unit are fixed to the circuit substrate, and the The harmonic suppression unit is provided on the circuit board, and the second antenna unit is grounded on the circuit board. 29. The microwave detection device according to claim 28, wherein the harmonic suppression antenna further comprises an electromagnetic reflection unit disposed on the circuit substrate, the electromagnetic reflection unit and the harmonic suppression unit are based on the The circuit substrates are arranged back-to-back. 30. The microwave detection device of claim 29, wherein the harmonic suppression antenna further comprises an antenna mount, wherein the first antenna unit and the second antenna unit are secured to the antenna mount by the antenna mount. the circuit substrate. 31. The microwave detection device of claim 30, wherein the first antenna unit further comprises a first feed end and a first mounting end integrally extending from the first feed end, wherein the first feed end A feeding end is mounted on the circuit substrate through the first mounting end, and the end of the first mounting end is electrically connected to the harmonic suppression unit, and the second antenna unit further includes a second feeding end The electrical terminal and a second mounting terminal integrally extending from the second feeding terminal, wherein the second mounting terminal is mounted on the circuit substrate.

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