CN218334298U

CN218334298U - Anti-interference microwave detection module

Info

Publication number: CN218334298U
Application number: CN202221688381.3U
Authority: CN
Inventors: 邹高迪; 邹新; 孙毅
Original assignee: Shenzhen Merrytek Technology Co Ltd
Current assignee: Shenzhen Merrytek Technology Co Ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2023-01-17
Anticipated expiration: 2032-07-01

Abstract

An anti-interference microwave detection module, it includes an antenna load and a electric capacity, the said antenna load includes a radiation source and a reference ground spaced from said radiation source, the feed end of the said radiation source is coupled to one end of the said electric capacity electrically, wherein name the circuit that is set up in the form of microstrip line in the interconnecting link between the feed end of the said radiation source and the said end of the said electric capacity is a microstrip transmission line, the state that the quantity corresponding to the said microstrip transmission line is one, the both ends of the said microstrip transmission line are the said end of the said electric capacity and the feed end of the said radiation source, wherein the another end of the said electric capacity links with corresponding circuit in order to insert the corresponding local oscillator signal and/or output the corresponding echo signal and regard the said antenna load as transmitting antenna and/or receiving antenna to use, wherein the said microstrip transmission line is set up to have 1/4 wavelength electrical length, in order to facilitate the impedance match between said antenna load and corresponding circuit at both ends of the said microstrip transmission line.

Description

Anti-interference microwave detection module

Technical Field

The utility model relates to a microwave detection field especially relates to an anti-interference microwave detection module.

Background

With the development of the internet of things technology, the requirements of artificial intelligence, smart home and intelligent security technology on environment detection, particularly on detection accuracy of human existence, movement and micro motion are higher and higher, and accurate judgment basis can be provided for intelligent terminal equipment only by acquiring a stable enough detection result. Among them, the radio technology, including the microwave detection technology based on the doppler effect principle, is used as a person and an object, and the important junction between the objects has unique advantages in the behavior detection and the existence detection technology, and can detect the action characteristics, the movement characteristics and the micromotion characteristics of a moving object, such as a person, even the heartbeat and the respiration characteristic information of the person without invading the privacy of the person, thereby having wide application prospect. Specifically, an antenna of a doppler microwave detection module in the prior art is fed by a local oscillator signal through a mixer, and transmits a detection beam corresponding to the frequency of the local oscillator signal in a corresponding detection space, and receives an echo formed by the detection beam being reflected by at least one object in the detection space to generate an echo signal, where the mixer receives the echo signal and outputs a doppler intermediate frequency signal corresponding to the frequency difference between the local oscillator signal and the echo signal in a frequency mixing detection manner, and then based on the doppler effect principle, the fluctuation of the doppler intermediate frequency signal in amplitude theoretically corresponds to the motion of the object in the detection space.

Since radio technology is both economically and homeland security critical as a hub for information transfer in the communication field, microwave doppler modules based on the doppler effect principle must strictly comply with the corresponding international standards and meet the corresponding regional regulations, such as the unlicensed ISM (Industrial Scientific Medical) frequency bands defined by ITU-R (ITU radio communication Sector) for use by organizations such as industry, science and medicine, among which the frequency bands applied to microwave detection modules based on the doppler effect principle mainly include the 2.4GHz, 5.8GHz, 10.525GHz, 24.125GHz, and the corresponding national and regional certification standards, such as RED certification of the european union and FCC certification of the united states, when using these frequency bands.

It can be understood that, when more than two frequency bands are closer, the adverse phenomenon of mutual interference is more likely to occur, especially for the currently common doppler microwave detection module using 5.8GHz, along with congestion of the adjacent frequency band of the 5.8GHz due to popularization of the 5G technology, the doppler microwave detection module will face more serious electromagnetic radiation interference, and in the RS test, because the microwave detection module is subjected to an anti-interference test by gradually increasing the frequency of the test signal by using an amplitude modulation signal, the microwave detection module using the 5.8GHz frequency band is fixed at a certain frequency point in the 5.8GHz frequency band, so that the doppler microwave detection module is certainly interfered by a test signal of a certain frequency or an odd harmonic, even harmonic or frequency multiplication signal generated by the frequency of the test signal in the RS test.

Therefore, in order to meet the corresponding national and regional certification standards and overcome the electromagnetic radiation interference faced in the use environment, a filtering manner is usually adopted to improve the anti-interference performance of the microwave detection module at present, for example, a high-frequency filter network and a low-frequency filter network are arranged between the antenna and the mixer of the microwave detection module to filter out interference signals, however, it can be understood that, in the circuit design, the simultaneous arrangement of the high-frequency filter network and the low-frequency filter network is not equivalent to the beneficial effect of the high-frequency filter network in filtering out high-frequency interference signals, and the simple superposition of the beneficial effect of the low-frequency filter network in filtering out low-frequency interference signals, but due to the electrical connection relationship between the high-frequency filter network and the low-frequency filter network, the performance parameters of the high-frequency filter network and the low-frequency filter network are changed, so that the high-frequency filter network and the low-frequency filter network cannot independently act on corresponding interference signals, and the anti-interference performance of the existing microwave detection module is difficult to be effectively improved.

Meanwhile, in order to ensure the anti-interference performance of the microwave detection module, the design between the antenna and the mixer must also satisfy corresponding impedance matching to ensure the signal quality and transmission efficiency of the local oscillator signal and the echo signal, but based on the error of mass production, the impedance matching between the antenna and the mixer is difficult to be satisfied, so that the existing microwave detection module cannot pass through RED certification of the european union and FCC certification of the united states in batches.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an anti-interference microwave detection module, wherein anti-interference microwave detection module include an antenna load and with antenna load electric coupling's corresponding circuit, wherein antenna load include a radiation source and with a radiation source looks spaced reference ground, the feed end of radiation source by electric coupling corresponding circuit, wherein the name the circuit that is set up with the microstrip line state in the interconnecting link between feed end of radiation source and the corresponding circuit is a microstrip transmission line, then correspond and be in the state that the quantity of microstrip transmission line is one, this the both ends of microstrip transmission line are the link of corresponding circuit and the feed end of radiation source, and correspond the quantity of microstrip transmission line is a plurality of states, adjacent two both ends electric connection of interconnect has a second capacitance or an inductance in the microstrip transmission line, wherein microstrip transmission line links to each other with corresponding circuit in order to insert corresponding local oscillator signal and/or output corresponding echo signal and will the antenna load uses as transmitting antenna and/or receiving antenna, wherein the microstrip transmission line is set up to have 1/4 wave length electric length, in order to do benefit to realize the impedance between antenna load and the corresponding circuit.

An object of the utility model is to provide an anti-interference microwave detection module, wherein is keeping on the basis that microstrip transmission line has 1/4 wavelength electric length, by electric coupling in microstrip transmission line both ends impedance matching design between antenna load and the corresponding circuit can be simplified, therefore is favorable to controlling anti-interference microwave detection module's wiring space, thereby is favorable to anti-interference microwave detection module's miniaturized design and simplification corresponding circuit layout.

An object of the utility model is to provide an anti-interference microwave detection module, wherein based on microstrip transmission line has the settlement of 1/4 wavelength electric length and does benefit to the realization microstrip transmission line both ends impedance matching between antenna load and the corresponding circuit to insert the impedance matching mode of electric capacity or inductance in the impedance matching design that is different from now and can avoid setting up the produced extra cost of electric capacity or inductance, be favorable to reducing anti-interference microwave detection module's manufacturing cost, and be favorable to improving anti-interference microwave detection module efficiency and yield in automated production.

An object of the utility model is to provide an anti-interference microwave detection module, wherein based on microstrip transmission line has the settlement of 1/4 wavelength electric length, has relaxed the tolerance of the impedance match between antenna load and the corresponding circuit, the electrical coupling that the error based on mass production forms promptly microstrip transmission line's corresponding circuit with antenna load's parameter variation can not influence impedance match between antenna load and the corresponding circuit, therefore can guarantee in the mass production the process uniformity of anti-interference microwave detection module avoids because of the detection of impedance match and the secondary operation flow that the adjustment formed, is favorable to improving the production efficiency and the yield of anti-interference microwave detection module have reduced simultaneously the manufacturing cost of anti-interference microwave detection module.

An object of the utility model is to provide an anti-interference microwave detection module, wherein based on the microstrip transmission line has the settlement of 1/4 wavelength electric length, has relaxed antenna load with the tolerance of impedance match between the corresponding circuit to eliminate the technology discreteness problem that mass production exists, guarantee anti-interference microwave detection module is at the technological uniformity of mass production, makes anti-interference microwave detection module can pass through European Union's RED authentication and the FCC authentication of USA in batches.

An object of the utility model is to provide an anti-interference microwave detection module, wherein on the basis that the microstrip transmission line has 1/4 wavelength electric length, can form impedance match between antenna load and the corresponding circuit, therefore be favorable to the suppression signal to be in transmission reflection when transmitting in the microstrip transmission line to the realization tends to the lossless ground transmission to the signal, so with the reduction anti-interference microwave detection module's loss.

An object of the utility model is to provide an anti-interference microwave detection module, wherein the transmission reflection of the signal of transmission on the microstrip transmission line can be suppressed and realize the microstrip transmission line tends to transmit to the signal lossless ground, therefore the transmission quality and the transmission efficiency of microstrip transmission line pair signal can be ensured, thereby are favorable to the guarantee the anti-interference performance of anti-interference microwave detection module.

An object of the utility model is to provide an anti-interference microwave detection module, wherein microstrip transmission line respectively electric coupling in corresponding circuit with antenna load to keep apart/buffering certainly the interference signal that antenna load scurried into, thereby avoid interference signal to scurry into corresponding circuit, so in order to improve anti-interference microwave detection module's interference killing feature.

An object of the utility model is to provide an anti-interference microwave detection module, wherein anti-interference microwave detection module includes an at least pair of filter network, and is a pair of including a first filter network and a second filter network in the filter network, wherein first filter network with second filter network is electric coupling respectively in the both ends of microstrip transmission line, with based on setting for that microstrip transmission line has 1/4 wavelength electric length forms right first filter network with the isolation of second filter network avoids first filter network with the performance parameter of second filter network produces the change because of electric connection relation each other, promptly first filter network with the performance parameter of second filter network is not influenced each other, therefore makes first filter network with second filter network can independently filter the harmonic and/or the interfering signal of different frequencies respectively, thereby improves anti-interference performance of anti-interference microwave detection module.

An object of the utility model is to provide an anti-interference microwave detection module, wherein the quantity of microstrip transmission line is allowed to be set up to a plurality ofly, and is a plurality of the microstrip transmission line is established ties and is set up, and under the length limit of microstrip transmission line, it is a plurality of the microstrip transmission line can tend to the lossless ground transmission signal to be distinguished from the signal loss who causes because of the transmission path extension of signal among the prior art, wherein based on each the both ends of microstrip transmission line set up filter network, with anti-interference microwave detection module forms multistage filter network, thereby improves anti-interference performance of anti-interference microwave detection module.

An object of the utility model is to provide an anti-interference microwave detection module, wherein the microstrip transmission line preferably with the parallel state in reference ground is set up, thereby increase in the signal of transmission on the microstrip transmission line with the coupling energy on reference ground, in order to further ensure microstrip transmission line is to signal transmission efficiency and transmission quality.

According to the utility model discloses an aspect, the utility model provides an anti-interference microwave detection module, wherein anti-interference microwave detection module includes:

a capacitor; and

an antenna load, wherein the antenna load comprises a radiation source and a reference ground spaced from the radiation source, a feed end of the radiation source is electrically coupled to one end of the capacitor, wherein a line arranged in a microstrip line state in a connecting line between the feed end of the radiation source and the capacitor is named as a microstrip transmission line, two ends of the microstrip transmission line are the feed end of the capacitor and the feed end of the radiation source, and two ends connected with each other in two adjacent microstrip transmission lines are electrically connected with a second capacitor or an inductor corresponding to the state that the number of the microstrip transmission lines is multiple, wherein the other end of the capacitor is connected with the corresponding circuit to access the corresponding local oscillation signal and/or output the corresponding echo signal to use the antenna load as a transmitting antenna and/or a receiving antenna, wherein each microstrip is arranged to have a 1/4 wavelength electrical length to widen impedance matching between the antenna load and the corresponding circuit, thereby facilitating implementation of impedance matching between the antenna load and the corresponding circuit at two ends of the microstrip transmission line.

In an embodiment, the anti-jamming microwave detection module includes at least one filter network electrically coupled to one end of the microstrip transmission line to filter out harmonic waves and/or jamming signals having a frequency different from the local oscillation signal.

In an embodiment, the number of the filter networks is at least one pair, wherein two filter networks in a pair of the filter networks are configured to have different filter parameters and are electrically coupled to two ends of the same microstrip transmission line, so as to form an isolation between the two filter networks based on the setting that the microstrip transmission line has a 1/4 wavelength electrical length, so that the two filter networks can independently filter out harmonic waves and/or interference signals of different frequencies.

In one embodiment, the microstrip transmission line is disposed in a state parallel to the reference ground.

In an embodiment, the anti-jamming microwave detection module includes an excitation source, where the excitation source is electrically connected to the other end of the capacitor, and the excitation source is configured and adapted to output the local oscillator signal in a powered state.

In an embodiment, the anti-jamming microwave detection module includes a mixer circuit, wherein the mixer circuit is electrically connected to the capacitor and the excitation source to output a doppler intermediate frequency signal corresponding to a frequency and a phase difference between the local oscillator signal and the echo signal based on a doppler effect principle.

In an embodiment, the anti-jamming microwave detection module includes an excitation source and a mixing circuit, the excitation source is configured and adapted to output the local oscillator signal in a powered state, the excitation source is electrically connected to the mixing circuit, wherein the mixing circuit is electrically connected to the other end of the capacitor, so as to output a doppler intermediate frequency signal corresponding to a frequency and a phase difference between the local oscillator signal and the echo signal based on a doppler effect principle.

In one embodiment, the excitation source and the mixing circuit are configured as a microwave chip in an integrated circuit.

In one embodiment, the microwave detection module includes a circuit substrate, wherein the reference ground is carried on the circuit substrate in a copper-clad manner, and the reference ground and the microstrip transmission line are carried on two opposite sides of the circuit substrate.

In an embodiment, the microwave detection module further includes a second reference ground, and the second reference ground and the microstrip transmission line are carried on the same surface of the circuit substrate in a state of being spaced apart from each other.

In an embodiment, the anti-jamming microwave detection module further includes a second reference ground and a second circuit substrate, wherein the second reference ground is carried on the second circuit substrate in a copper-clad layer manner, the second circuit substrate is connected to a surface of the circuit substrate not carrying the reference ground in a manner that the second reference ground faces away from the circuit substrate, and the microstrip transmission line is disposed between the circuit substrate and the second circuit substrate.

In one embodiment, wherein the circuit substrate is an FR4 board, the microstrip transmission line has a physical length of 7.1mm ± 1.5mm and a gap of 0.127mm or more and 1.6mm or less from the reference ground corresponding to the ISM band of 5.8GHz when the anti-interference microwave detection module is configured to operate.

According to the utility model discloses a further aspect, the utility model provides an anti-interference microwave detection module, wherein anti-interference microwave detection module includes:

a capacitor;

a mixer circuit;

an antenna load, wherein the antenna load comprises a radiation source and a ground reference spaced from the radiation source, wherein the mixing circuit is electrically coupled to one end of the capacitor so as to be electrically coupled to a feeding terminal of the radiation source through the capacitor, thereby receiving a corresponding echo signal and outputting a doppler intermediate frequency signal corresponding to a frequency and phase difference between the corresponding local oscillator signal and the echo signal, wherein a line arranged in a microstrip line state in a connecting line between the mixing circuit and the capacitor is named as a microstrip transmission line, and a second capacitor or an inductor is electrically connected to two ends of the microstrip transmission line, which are connected to each other, in adjacent two microstrip transmission lines, so as to widen an impedance matching tolerance between the antenna load and the mixing circuit, thereby facilitating an impedance matching between the antenna load and the mixing circuit.

In an embodiment, the anti-jamming microwave detection module includes an excitation source, wherein the excitation source is electrically connected to the mixing circuit and configured and adapted to output the local oscillator signal in a powered state.

In an embodiment, the anti-jamming microwave detection module includes a circuit substrate and a second reference ground, and the second reference ground and the microstrip transmission line are carried on the same surface of the circuit substrate in a state of being spaced apart from the microstrip transmission line.

Further objects and advantages of the invention will become apparent from a consideration of the ensuing description and drawings.

Drawings

Fig. 1A is a schematic diagram illustrating an equivalent circuit of an anti-interference microwave detection module according to a first embodiment of the present invention.

Fig. 1B is an equivalent circuit schematic diagram of a variant embodiment of the anti-interference microwave detection module according to the first embodiment of the present invention.

Fig. 1C is a schematic diagram illustrating an equivalent circuit of a variant embodiment of the anti-interference microwave detection module according to the first embodiment of the present invention.

Fig. 1D is an equivalent circuit schematic diagram of a variant embodiment of the anti-interference microwave detection module according to the first embodiment of the present invention.

Fig. 2A is an equivalent circuit schematic diagram of an anti-interference microwave detection module according to a second embodiment of the present invention.

Fig. 2B is an equivalent circuit schematic diagram of a variant embodiment of the anti-interference microwave detection module according to the second embodiment of the present invention.

Fig. 2C is an equivalent circuit schematic diagram of a variant embodiment of the anti-interference microwave detection module according to the second embodiment of the present invention.

Fig. 3A and 3B are S11 curves and S12 curves of a contrast experiment of the anti-interference microwave detection module according to the above embodiment of the present invention.

Fig. 4A and 4B are S11 curves and S12 curves of another comparative experiment of the anti-interference microwave detection module according to the above embodiment of the present invention.

Fig. 5A is a schematic circuit layout diagram of the anti-interference microwave detection module according to the above embodiment of the present invention.

Fig. 5B is another schematic circuit layout diagram of the anti-interference microwave detection module according to the above embodiment of the present invention.

Fig. 5C is another schematic circuit layout diagram of the anti-interference microwave detection module according to the above embodiment of the present invention.

Fig. 6A is a schematic diagram of an equivalent circuit principle of a contrast experiment according to the present invention.

Fig. 6B shows S11 curves and S12 curves of the above comparative experiment according to the present invention.

Fig. 6C is a schematic diagram illustrating an equivalent circuit principle of the above comparative experiment in a state where the microstrip transmission line is disposed.

Fig. 6D shows the S11 curve and the S12 curve of the above comparative experiment according to the present invention in the state where the microstrip transmission line is provided.

Fig. 7 is an equivalent circuit schematic diagram of a variant embodiment of the anti-interference microwave detection module according to the above embodiment of the present invention.

Fig. 8 is a schematic diagram illustrating an equivalent circuit of a variant embodiment of the anti-interference microwave detection module according to the present invention.

Detailed Description

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

It will be understood by those skilled in the art that in the present disclosure, the terms "vertical," "horizontal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the specification and are not intended to indicate or imply that the referenced device or element must have the specified orientation, configuration, or operation in the specified orientation.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

Referring to fig. 1A to 1D of the drawings of the specification of the present invention, schematic diagrams of equivalent circuit principles of an anti-interference microwave detection module and its variant embodiments according to an embodiment of the present invention are respectively illustrated, wherein the anti-interference microwave detection module includes a capacitor 10A and an antenna load 30, wherein the antenna load 30 includes a radiation source 31 and a reference ground 32 spaced from the radiation source 31, a feeding terminal of the radiation source 31 is electrically coupled to one end of the capacitor 10A, a line set in a microstrip line state in a connecting line between the feeding terminal of the radiation source 31 and the end of the capacitor 10A is a microstrip transmission line 20 corresponding to a state where the number of the microstrip transmission lines 20 is one, and two ends of the microstrip transmission line 20 are the end of the capacitor 10A and the feeding terminal of the radiation source 11, wherein the other end of the capacitor 10A is connected to a corresponding circuit for accessing a corresponding local oscillator circuit and/or outputting a corresponding echo signal, and the antenna load is used as a transmitting antenna and/or a receiving antenna, wherein the antenna load 30 is set in a state that the radiation source 31 is excited by the local oscillator signal feed, the radiation source 31 can transmit a probe beam corresponding to the frequency of the local oscillator signal in cooperation with the reference ground 32 and/or receive an echo formed by the probe beam being reflected by at least one object and return the echo signal, so that when a doppler intermediate frequency signal corresponding to the frequency and phase difference between the local oscillator signal and the echo signal is output based on a mixed detection method, the fluctuation of the doppler intermediate frequency signal in amplitude corresponding to the movement of the object based on the doppler effect principle is suitable for characterizing the human body in a detection application of human body movement And (6) moving.

It should be understood by those skilled in the art that in a high frequency circuit, "electrical coupling" may be understood as a direct electrical connection relationship, and may also be understood as a coupling connection relationship formed via a corresponding component such as a capacitor.

In particular, the microstrip transmission line 20 is configured to have a 1/4 wavelength electrical length, so as to facilitate impedance matching between the antenna load 30 and a corresponding circuit at two ends of the microstrip transmission line 20 based on the setting that the microstrip transmission line 20 has the 1/4 wavelength electrical length, thereby ensuring the transmission efficiency of the microstrip transmission line 20 for the local oscillator signal and/or the echo signal.

It is worth mentioning that in the description of the present invention, because of the existence of industrial error, the description and limitation of the relationship based on the wavelength electrical length is allowed to have an error range of 20% in the actual measurement, and for example, "the microstrip transmission line 20 is set to have 1/4 wavelength electrical length" should be understood as "the microstrip transmission line 20 is set to have 1/4 wavelength electrical length within an error range of 20%.

It is worth mentioning that, based on the reciprocal transceiver characteristic of the antenna load 30, when the antenna load 30 transmits the probe beam and returns the echo signal in a transceiver integrated manner, or transmits the probe beam in a transmitting manner, or receives the echo signal in a returning manner, based on the setting that the microstrip transmission line 20 has a 1/4 wavelength electrical length, the transmission reflection of the local oscillator signal and/or the echo signal during transmission in the microstrip transmission line 20 is favorably suppressed, so that the microstrip transmission line 20 tends to transmit the signal without loss, thereby reducing the loss of the anti-interference microwave detection module, and based on the microstrip transmission line 20 tends to transmit the signal without loss, the transmission quality and transmission efficiency of the signal can be ensured, thereby being favorable for ensuring the anti-interference performance of the anti-interference microwave detection module.

Referring specifically to fig. 1A, the antenna load 30 is configured in a transmitting mode, wherein the anti-jamming microwave detection module includes an excitation source 50, the excitation source 50 is electrically connected to the other end of the capacitor 10A, wherein the excitation source 50 is configured and adapted to output the local oscillator signal in a powered state, and the local oscillator signal is transmitted to the radiation source 31 through the microstrip transmission line 20, so that the radiation source 31 is powered and excited to transmit the detection beam corresponding to the frequency of the local oscillator signal in cooperation with the reference ground 32.

Referring further to fig. 1B, the antenna load 30 is disposed in a receiving configuration, wherein the anti-jamming microwave detection module includes a mixing circuit 40, the mixing circuit 40 is electrically connected to the other end of the capacitor 10A and the excitation source 50, wherein the radiation source 31 receives an echo formed by the detection beam reflected by at least one object and returns the echo signal, the echo signal is transmitted through the microstrip transmission line 20 and received by the mixing circuit 40, and the mixing circuit 40 outputs a doppler intermediate frequency signal corresponding to the frequency and phase difference between the local oscillator signal and the echo signal based on the doppler effect principle.

Referring further to fig. 1C, the antenna load 30 is disposed in a transceiving integrated manner, wherein the excitation source 50 is electrically connected to the other end of the capacitor 10A, and the mixing circuit 40 is electrically connected to the capacitor 10A and the excitation source 50, wherein the excitation source 50 is disposed and adapted to output the local oscillator signal in a powered state, the local oscillator signal is transmitted to the radiation source 31 through the microstrip transmission line 20, so that the radiation source 31 is fed and excited to transmit the probe beam corresponding to the frequency of the local oscillator signal in cooperation with the reference ground 32, the radiation source 31 further receives an echo formed by the probe beam reflected by at least one object and transmits the echo signal back to the mixing circuit 40 through the microstrip transmission line 20, and the mixing circuit 40 outputs an intermediate frequency doppler signal corresponding to the frequency and phase difference between the local oscillator signal and the echo signal based on the doppler effect principle.

In particular, referring to fig. 1D, the excitation source 50 and the mixing circuit 40 are suitable to be designed in an integrated circuit form and configured as a microwave chip, so as to facilitate simplification of the circuit design of the tamper-resistant microwave detection module, and further facilitate improvement of the production efficiency of the tamper-resistant microwave detection module.

It should be noted that the microstrip transmission line 20 is electrically coupled to a corresponding circuit through the capacitor 10A to filter out dc components in the local oscillator signal and the echo signal, thereby being beneficial to ensuring the anti-interference performance of the anti-interference microwave detection module.

Similarly, further referring to fig. 2A to 2C of the drawings attached to the present application, according to the present invention, an equivalent circuit schematic diagram of an anti-interference microwave detection module according to a second embodiment and an equivalent circuit schematic diagram of a variant embodiment thereof are respectively illustrated, wherein the anti-interference microwave detection module includes a capacitor 10B, an antenna load 30 and a mixing circuit 40, wherein the antenna load includes a radiation source 31 and a reference ground 32 spaced from the radiation source 31.

Referring to fig. 2A specifically, taking the antenna load 30 in a receiving configuration as an example, wherein the mixing circuit 40 is electrically coupled to one end of the capacitor 10B, and is electrically coupled to the feeding end of the radiation source 32 through the capacitor 10B, so as to receive a corresponding echo signal and output a doppler intermediate frequency signal corresponding to a frequency and a phase difference between the corresponding local oscillator signal and the echo signal, wherein a line arranged in a microstrip line configuration in a connecting line between the mixing circuit 40 and the end of the capacitor 10B is named as a microstrip transmission line 20, and then a state corresponding to one number of the microstrip transmission lines 20 is provided, and two ends of the microstrip transmission line 20 are an echo signal input end of the mixing circuit 40 and the end of the capacitor 10B, and in this embodiment, too, by setting the microstrip transmission line 20 to have an electrical length of 1/4 wavelength, so as to widen a tolerance of impedance matching between the antenna load 30 and the mixing circuit 40, thereby facilitating implementation of impedance matching between the antenna load 30 and the mixing circuit 40 at two ends of the microstrip transmission line 20.

With further reference to fig. 2B, the anti-jamming microwave detection module includes an excitation source 50, and the excitation source 50 is electrically connected to the mixing circuit 40 and is configured to output the local oscillator signal in a powered state. In particular, referring to fig. 2C, the mixing circuit 40 and the excitation source 50 are designed in an integrated circuit form and are configured as a microwave chip.

In particular, in a state where the antenna load 30 is configured in a receiving mode or a transceiving mode, the microstrip transmission line 20 is electrically coupled between the mixer circuit 40 and the antenna load 30 to form an isolation/buffer for the interference signal entering from the antenna load 30, so as to prevent the interference signal from entering the mixer circuit 40, thereby improving the interference resistance of the interference-resistant microwave detection module.

It is worth mentioning that, based on the setting that the microstrip transmission line 20 has a wavelength electrical length of 1/4, the tolerance of impedance matching between the antenna load 30 electrically coupled to both ends of the microstrip transmission line 20 and the corresponding circuit is relaxed, that is, the impedance matching between the antenna load 30 and the corresponding circuit is not affected by the parameter change of the corresponding circuit element electrically coupled to the microstrip transmission line 20 and the antenna load 30 formed based on the error of mass production, so that the process consistency of the anti-interference microwave detection module can be ensured in mass production, the secondary processing flow formed by the detection and adjustment of impedance matching is avoided, the anti-interference microwave detection module can realize full-automatic production, which is beneficial to improving the production efficiency of the anti-interference microwave detection module and reducing the production cost of the anti-interference microwave detection module.

Specifically, it is verified that the microstrip transmission line 20 has a tolerance relaxation effect on impedance matching between the respective circuits at both ends thereof and the antenna load 30 in a state where the microstrip transmission line 20 is set to have a wavelength electrical length of 1/4 by setting different impedance values for the respective circuits at both ends thereof and the antenna load 30 and changing the wavelength electrical length of the microstrip transmission line 20. Specifically, the ISM operating frequency band of 5.8GHz is taken as an example, and referring to fig. 3A and 3B of the drawings of the present invention, on the premise that the impedance value of the corresponding circuit electrically coupled to the two ends of the microstrip transmission line 20 and the impedance value of the antenna load 30 are set to 50 ohm and 40 ohm, respectively, the S11 curve and the S12 curve corresponding to the state where the microstrip transmission line 20 has the electrical length of 1/4 wavelength and the electrical length of 1/8 wavelength are illustrated, specifically referring to fig. 3A, in the state where the microstrip transmission line 20 has the electrical length of 1/4 wavelength, even if the impedance value of the corresponding circuit and the impedance value of the antenna load 30 are not consistent, the corresponding S11 curve still presents a significant resonance frequency point near 5.8GHz and can be matched with the operating frequency band of 5.8GHz, and the loss of the resonance is as low as-41 dB, and the corresponding ISM curve has a loss near 0dB at 5.8GHz, that is a small frequency point at which the transmission of the microstrip transmission line 20 transmits signals; referring to fig. 3B, in a state where the microstrip transmission line 20 has an electrical length of 1/8 of a wavelength, the corresponding S11 curve does not generate a significant resonant frequency point.

Further verifiably, referring to fig. 4A and 4B, in which the impedance value of the corresponding circuit to be electrically coupled to both ends of the microstrip transmission line 20 and the impedance value of the antenna load 30 are set to 50 ohms and 60 ohms, respectively, and the S11 curve and the S12 curve corresponding to the state where the microstrip transmission line 20 has a wavelength electrical length of 1/4 and a wavelength electrical length of 1/8 are illustrated, respectively, wherein in the state where the microstrip transmission line 20 has a wavelength electrical length of 1/4, corresponding to fig. 4A, the corresponding S11 curve exhibits a significant resonance frequency point near 5.8GHz to be able to match with an ISM operating band of 5.8GHz, and the loss of the corresponding S12 curve at the resonance frequency point of 5.8GHz is as low as-32 dB or less, and the loss of the same is close to 0dB; the S11 curve corresponding to the state of the microstrip transmission line 20 having a wavelength of 1/8 as shown in fig. 4B does not generate a significant resonant frequency point.

Therefore, as can be seen from comparing fig. 3A and 3B and fig. 4A and 4B, the microstrip transmission line 20 is configured to have an electrical length of 1/4 wavelength, which has a relaxing effect on the tolerance of impedance matching between the antenna load 30 electrically coupled to two ends of the microstrip transmission line and the corresponding circuit, so that it is avoided that the impedance matching between the antenna load 30 and the corresponding circuit is affected by the parameter variation of the corresponding circuit element and the antenna load 30 electrically coupled to the microstrip transmission line 20 due to the process dispersion problem of the board material, the corresponding production process, and the like in the mass production process, that is, based on the setting of the microstrip transmission line 20 having the electrical length of 1/4 wavelength, the process dispersion problem of the microwave detection module in the mass production is eliminated, and the process consistency of the microwave detection module in the mass production is ensured, so that the microwave detection module can pass through RED certification and FCC certification in the united states in batch.

That is to say, the utility model discloses based on setting for of microstrip transmission line 20's wavelength electric length does benefit to the realization microstrip transmission line 20 with impedance match between antenna load 30 and the corresponding circuit, thereby eliminated anti-interference microwave detection module produced error influence in the mass production process anti-interference performance of anti-interference microwave detection module has ensured guarantee in the time of anti-interference microwave detection module's production efficiency anti-interference microwave detection module's performance.

Further, the impedance matching design between the antenna load 30 electrically coupled to the two ends of the microstrip transmission line 20 and the corresponding circuit can be simplified on the basis of maintaining the microstrip transmission line 20 to have the electrical length of 1/4 wavelength, thereby facilitating the control of the wiring space of the microwave detection module, thereby facilitating the miniaturization design of the microwave detection module and simplifying the corresponding circuit layout.

Referring to fig. 5A, a circuit layout of the anti-jamming microwave detecting module is simply illustrated, wherein the anti-jamming microwave detecting module includes a circuit substrate 70, wherein the reference ground 32 is supported on the circuit substrate 70 in a copper-clad layer form, and in this illustration, the reference ground 32 and the microstrip transmission line 20 are relatively supported on two sides of the circuit substrate, it can be understood that, in some embodiments of the present invention, the reference ground 32 is also allowed to be supported on the same side of the circuit substrate 70 with the microstrip transmission line 20 in a spaced state with the microstrip transmission line 20, which is not limited by the present invention.

Preferably, the mixer circuit 40, the capacitor 10A (10B) and the microstrip transmission line 20 are carried on the same surface of the circuit substrate 70, so as to realize a structural configuration of circuit layout on one surface of the circuit substrate 70, thereby greatly reducing the production material consumption and the production process of the anti-interference microwave detection module.

Optionally, referring to fig. 5B of the drawings of the specification of the present invention, another circuit layout of the anti-interference microwave detection module is simply illustrated, specifically on the basis of the circuit layout of the anti-interference microwave detection module illustrated in fig. 5A, the anti-interference microwave detection module further includes a second reference ground 32', and the second reference ground 32' is supported on the same surface of the circuit substrate 70 with the microstrip transmission line 32' and the microstrip transmission line 20 spaced apart from each other.

Optionally, referring to fig. 5C of the drawings of the present disclosure, another circuit layout of the microwave detection module is simply illustrated, specifically, on the basis of the circuit layout of the microwave detection module illustrated in fig. 5A, wherein the microwave detection module further includes a second reference ground 32 'and a second circuit substrate 70', wherein the second reference ground 32 'is supported on the second circuit substrate 70' in a copper-clad layer manner, and the second circuit substrate 70 'is connected to a surface of the circuit substrate 70 not supporting the reference ground 32 in a state where the second reference ground 32' faces away from the circuit substrate 70, and the microstrip transmission line 20 is disposed between the circuit substrate 70 and the second circuit substrate 70', so as to form a state where the microstrip transmission line 20 is located between the reference ground 32 and the second reference ground 32', thereby forming a cladding of the microstrip transmission line 20 based on the reference ground 32 and the second reference ground 32', enhancing shielding of the transmission line 20 on the reference ground 32 and the second reference ground 32', and further improving the interference-free interference detection capability of the microstrip transmission line 20.

Preferably, the microstrip transmission line 20 is disposed in a state parallel to the reference ground 32, so as to increase the coupling energy between the signal transmitted on the microstrip transmission line 20 and the reference ground 32, further ensure the transmission efficiency and transmission quality of the microstrip transmission line 20 for the signal, and reduce the loss of the microwave detection module and the interference rejection performance of the microwave detection module.

Further, wherein based on the purpose of ensuring the anti-interference performance of the anti-interference microwave detection module, the anti-interference microwave detection module includes at least one filter network, the filter network is electrically coupled to one end of the microstrip transmission line to filter out the harmonic and/or the interference signal with the frequency different from the local oscillator signal, specifically the utility model discloses an anti-interference microwave detection module includes a first filter network 61, wherein the first filter network 61 is electrically coupled to one end of the microstrip transmission line 20 to filter out the harmonic and/or the interference signal with the non-target frequency band, i.e. filter out the interference signal with the frequency different from the local oscillator signal, and further improve the anti-interference performance of the anti-interference microwave detection module, it can be understood that, wherein the first filter network 61 can be specifically implemented as an equivalent inductor, an equivalent capacitor, a series circuit of an equivalent inductor and an equivalent capacitor, a parallel circuit of an equivalent inductor and an equivalent capacitor, and a series-parallel circuit of an equivalent inductor and an equivalent capacitor, and the utility model discloses this is not limited.

In particular, the anti-jamming microwave probe module includes a second filter network 62 to form a pair of filter networks with the first filter network 61, the second filter network 62 is electrically coupled to the other end of the microstrip transmission line 20, and is configured to have filter parameters different from those of the first filter network 61, that is, the first filter network 61 and the second filter network 62 are respectively electrically coupled to two ends of the microstrip transmission line 20 and are adapted to filter harmonic waves and/or interference signals with different frequencies, so as to improve the filtering effect on interference signals in a non-target frequency band. Specifically, in this embodiment of the present invention, the first filter network 61 is configured to filter out low frequency signals in a non-target frequency band, such as low frequency signals in a non-target frequency band generated by the action of the tiny objects in the echo signal, wherein the second filter network 62 is configured to filter out high frequency signals in a non-target frequency band, such as high frequency electromagnetic interference, second harmonic, multiple harmonic, etc., so that the anti-interference microwave detection module can pass through RED authentication in the european union and FCC authentication in the united states.

Specifically, in a state where the antenna load 30 is set in a transmitting mode, the corresponding filter network filters the harmonic, in a state where the antenna load 30 is set in a receiving mode, the corresponding filter network filters the interference signal in the echo signal, and in a state where the antenna load 30 is set in a transceiving mode, the corresponding filter network filters the harmonic and the interference signal.

In particular, the first filter network 61 and the second filter network 62 are allowed to be set in a state of being directly connected to the microstrip transmission line 20, and are also allowed to be set in a state of being connected to the microstrip transmission line 20 in a capacitive coupling manner.

It should be noted that the first filter network 61 and the second filter network 62 are electrically coupled to two ends of the microstrip transmission line 20, respectively, so as to form isolation between the first filter network 61 and the second filter network 62 based on the setting that the microstrip transmission line 20 has 1/4 wavelength electrical length, and avoid the performance parameters of the first filter network 61 and the second filter network 62 from being changed due to the electrical connection relationship therebetween, i.e. the performance parameters of the first filter network 61 and the second filter network 62 are not affected by each other, so that the first filter network 61 and the second filter network 62 can filter the interference signals with different frequencies independently, respectively, thereby improving the anti-interference performance of the anti-interference microwave detection module.

Referring specifically to fig. 6A to 6D of the drawings accompanying the specification of the present invention, using the first embodiment as an example, the present invention is right for the first filter network 61 and the second filter network 62 directly connected state and pass through the equivalent circuit schematic diagram and S11 curve and S12 curve of the comparative experiment that the state that microstrip transmission line 20 connects was simulated are respectively illustrated, in this comparative experiment of the present invention, the first filter network 61 is specifically implemented as a grounding filter network composed of an equivalent inductor and an equivalent capacitor in parallel, the second filter network 62 is specifically implemented as a filter network of an equivalent capacitor one end grounding.

Corresponding to fig. 6A, in which the first filter network 61 and the second filter network are directly connected, corresponding to fig. 6B, the corresponding S11 curve passband is narrow and only exhibits a valley, which represents the change of the performance parameter of the first filter network 61 and the second filter network 62 caused by the direct connection relationship with each other, it can be understood that the first filter network 61 and the second filter network 62 are combined into a new filter network due to the direct connection, that is, the first filter network 61 and the second filter network 62 cannot independently act on the interference signals of the corresponding frequency bands.

Corresponding to fig. 6C, in which the first filter network 61 and the second filter network 62 are electrically coupled to two ends of the microstrip transmission line 20, respectively, that is, the first filter network 61 and the second filter network 62 are connected through the microstrip transmission line 20, as can be seen from comparison between fig. 6B and fig. 6D, in a state where the microstrip transmission line 20 is disposed between the first filter network 61 and the second filter network 62, the corresponding S11 curve pass bandwidth is increased, which is beneficial for ensuring performance consistency of corresponding modules after batch production, and the corresponding S11 curve obviously presents two troughs, that is, it is illustrated that the performance parameters of the first filter network 61 and the second filter network 62 are changed due to the electrical connection relationship between the microstrip transmission line 20 to the first filter network 61 and the second filter network 62, so that the first filter network 61 and the second filter network 62 can independently filter harmonic waves of different frequencies and the harmonic waves of the second filter network 62, or harmonic waves of the corresponding microstrip transmission line 20D are not changed due to the electrical connection relationship between the first filter network 61 and the second filter network 62, and the harmonic waves of the corresponding resonance transmission line 20 are not changed, although the harmonic waves of the corresponding filter network 12 dB are set up to the resonance frequency point 12 of the microstrip transmission line 20.

That is to say, the utility model discloses a right microstrip transmission line 20 has the settlement of 1/4's wavelength electrical length, makes by electric coupling microstrip transmission line 20 both ends when impedance matching design between antenna load 30 and the corresponding circuit can be simplified, form the isolation to different filter networks, therefore can avoid using extra device to keep apart and increase filter networks the loss of anti-interference microwave detection module, and be favorable to simplifying the circuit design of anti-interference microwave detection module, thereby be favorable to the miniaturized design of anti-interference microwave detection module with simplify corresponding circuit layout.

Particularly, in a state where the microstrip transmission line 20 is set to have a wavelength electrical length of 1/4, the microstrip transmission line 20 is set between the corresponding circuit and the antenna load 30 without increasing additional loss, so based on the setting of the wavelength electrical length of the microstrip transmission line 20, the impedance matching design between the antenna load 30 electrically coupled to the two ends of the microstrip transmission line 20 and the corresponding circuit can be simplified, so as to be different from the existing impedance matching design in an impedance matching manner of accessing a capacitor or an inductor, thereby avoiding additional cost caused by setting the capacitor or the inductor, facilitating reduction of the production cost of the anti-jamming microwave detection module, and facilitating improvement of efficiency and yield of the anti-jamming microwave detection module in automated production.

It is worth mentioning that, wherein under the setting that the microstrip transmission line 20 has a wavelength electrical length of 1/4, the number corresponding to the microstrip transmission line 20 is a plurality of states, the setting of the microstrip transmission line 20 does not increase extra loss, therefore, in some variant embodiments of the present invention, wherein the number of the microstrip transmission line 20 is allowed to be set to be a plurality, refer to fig. 7 of the drawings of the specification of the present invention specifically as an example, an equivalent circuit schematic diagram of a variant embodiment of the anti-interference microwave detection module is illustrated, wherein the number of the microstrip transmission line 20 is two, for convenience of description, the present invention names two microstrip transmission lines as microstrip transmission line 20 and second microstrip transmission line 20', wherein the microstrip transmission line 20 and the second microstrip transmission line 20' are set in series, wherein under the setting that the microstrip transmission line 20 is set to have a wavelength electrical length of 1/4, the microstrip transmission line 20 and the second microstrip transmission line 20' can tend to transmit signals without loss, so as to be different from the existing technologies, the extension of the signal transmission path of the microstrip transmission line is suitable for increasing the anti-interference detection network based on the filtering of the microstrip transmission line, thereby increasing the number of the anti-interference detection module.

In particular, in the variant embodiment shown in fig. 7, wherein the anti-jamming microwave detection module further comprises another pair of filter networks, for convenience of description, the two filter networks of the another pair of filter networks are named differently as a third filter network 63 and a fourth filter network 64, wherein the third filter network 63 and the fourth filter network 64 are electrically coupled to two ends of the two microstrip transmission lines 20' respectively, and are configured to have different filter parameters from the first filter network 61 and the second filter network 62, so that the anti-jamming microwave detection module forms a multistage filter network.

In particular, in order to ensure that the length parameter of each microstrip transmission line 20 is not affected corresponding to a state where the number of the microstrip transmission lines 20 is multiple, each microstrip transmission line 20 is connected through a pad in an actual layout to form a definition of the microstrip transmission line 20, and preferably, in a state where the number of the microstrip transmission lines 20 is multiple, two ends of each two adjacent microstrip transmission lines 20 that are connected to each other are electrically connected with an equivalent capacitor or an equivalent inductor, specifically, in this variant embodiment shown in fig. 7, the anti-interference microwave detection module includes at least one second capacitor 80, and the second capacitor 80 is disposed between the microstrip transmission lines 20 to couple and connect in series each microstrip transmission line 20, and form an isolation and a definition of each microstrip transmission line 20.

It should be mentioned that, referring to fig. 8 of the drawings of the present invention, the first embodiment is also taken as an example, the schematic diagram of an equivalent circuit of a modified embodiment of the anti-interference microwave detection module is illustrated, in the modified embodiment of the anti-interference microwave detection module shown in fig. 8, one end of the second capacitor 80 is connected between the microstrip transmission line 20 and the second microstrip transmission line 20', and the other end of the second capacitor 80 is grounded to form isolation and definition of the microstrip transmission line 20 and the second microstrip transmission line 20', wherein the microstrip transmission line 20 and the second microstrip transmission line 20' are electrically connected to the same pad in an actual layout to form a series connection relationship.

It is understood that the conversion of the electrical length of the microstrip transmission line 20 to the physical length of the microstrip transmission line 20 is different based on the thickness of the board material and the board material where the microstrip transmission line 20 is located. Wherein for example, the anti-interference microwave detection module is configured to operate in ISM band of 5.8GHz ± 75MHz, wherein the circuit substrate 70 is implemented as FR4 board and has a board thickness of 1mm, wherein the microstrip transmission line has a physical length of 7.1mm ± 1.5mm and has a gap of 0.127mm or more and 1.6mm or less with the reference ground 12.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims

1. Anti-interference microwave detection module, its characterized in that includes:

a capacitor; and

2. The tamper resistant microwave detection module of claim 1, wherein the tamper resistant microwave detection module includes at least one filter network electrically coupled to an end of the microstrip transmission line to filter out harmonics and/or interference signals of a frequency different from the local oscillator signal.

3. The anti-jamming microwave detection module according to claim 2, wherein the number of the filter networks is at least one pair, wherein two filter networks of a pair of the filter networks are configured to have different filter parameters and are electrically coupled to two ends of the same microstrip transmission line, respectively, so as to form an isolation between the two filter networks based on the setting that the microstrip transmission line has a 1/4 wavelength electrical length, so that the two filter networks can independently filter out harmonic waves and/or jamming signals of different frequencies, respectively.

4. The tamper resistant microwave detection module of any of claims 1-3 wherein the microstrip transmission line is disposed in a state parallel to the reference ground.

5. The tamper-resistant microwave detection module of claim 4, wherein the tamper-resistant microwave detection module comprises an excitation source, wherein the excitation source is electrically connected to the other end of the capacitor, the excitation source being configured and adapted to output the local oscillator signal in a powered state.

6. The interference rejection microwave detection module according to claim 5, wherein said interference rejection microwave detection module comprises a mixer circuit, wherein said mixer circuit is electrically connected to said capacitor and said excitation source to output a Doppler intermediate frequency signal corresponding to a frequency and phase difference between said local oscillator signal and said echo signal based on Doppler effect principle.

7. The interference rejection microwave detection module according to claim 4, wherein said interference rejection microwave detection module comprises a driver and a mixer circuit, said driver being configured and adapted to output said local oscillator signal in a powered state, said driver being electrically connected to said mixer circuit, wherein said mixer circuit is electrically connected to another end of said capacitor to output a Doppler intermediate frequency signal corresponding to a frequency and phase difference between said local oscillator signal and said echo signal based on Doppler principle.

8. The tamper resistant microwave detection module of claim 6 or 7 wherein the excitation source and the mixing circuit are configured as a microwave chip in an integrated circuit configuration.

9. The tamper-resistant microwave detection module of claim 4 wherein the tamper-resistant microwave detection module includes a circuit substrate, wherein the reference ground is carried on the circuit substrate in a copper clad configuration, wherein the reference ground and the microstrip transmission line are carried on opposite sides of the circuit substrate.

10. The tamper resistant microwave detection module of claim 9 further including a second reference ground plane carried on the same side of the circuit substrate as the microstrip transmission line in spaced relation thereto.

11. The tamper resistant microwave detection module of claim 9 further comprising a second reference ground plane and a second circuit substrate, wherein the second reference ground plane is carried on the second circuit substrate in a copper clad laminate configuration, the second circuit substrate is connected to a side of the circuit substrate not carrying the reference ground plane in a configuration in which the second reference ground plane faces away from the circuit substrate, and the microstrip transmission line is disposed between the circuit substrate and the second circuit substrate.

12. The tamper resistant microwave detection module of claim 9 wherein the circuit substrate is an FR4 board, the microstrip transmission line having a physical length of 7.1mm ± 1.5mm and a gap of 0.127mm or greater and 1.6mm or less from the reference ground corresponding to when the tamper resistant microwave detection module is configured to operate in the ISM band of 5.8 GHz.

13. Anti-interference microwave detection module, its characterized in that includes:

a capacitor;

a mixer circuit;

an antenna load, wherein the antenna load comprises a radiation source and a reference ground spaced from the radiation source, wherein the mixer circuit is electrically coupled to one end of the capacitor so as to be electrically coupled to a feeding terminal of the radiation source through the capacitor, so as to receive a corresponding echo signal and output a doppler intermediate frequency signal corresponding to a frequency and phase difference between the corresponding local oscillator signal and the echo signal, wherein a line disposed in a microstrip line state in a connecting line between the mixer circuit and the capacitor is named as a microstrip transmission line, and both ends of the microstrip transmission line are an echo signal input terminal of the mixer circuit and the end of the capacitor, and both ends of the microstrip transmission line are electrically connected to a second electric inductor, and wherein the microstrip transmission line has an electric length of 1/4 wavelength, so as to widen a tolerance of impedance matching between the antenna load and the mixer circuit, thereby facilitating an impedance matching between the antenna load and the mixer circuit at both ends of the microstrip transmission line.

14. The microwave detection module of claim 13, wherein the microwave detection module comprises at least one filter network electrically coupled to one end of the microstrip transmission line to filter out harmonics and/or interference signals of a frequency different from the local oscillator signal, wherein the number of the filter networks is at least one pair, and two filter networks of a pair of the filter networks are configured to have different filter parameters and are electrically coupled to two ends of the same microstrip transmission line, respectively, so as to form an isolation between the two filter networks based on the setting that the microstrip transmission line has a 1/4 wavelength electrical length, so that the two filter networks can independently filter out harmonics and/or interference signals of different frequencies, respectively.

15. The tamper-resistant microwave detection module of claim 13, wherein the tamper-resistant microwave detection module includes an excitation source, wherein the excitation source is electrically coupled to the mixing circuit and configured and adapted to output the local oscillator signal in a powered state.

16. The tamper resistant microwave detection module of claim 15 wherein the excitation source and the mixing circuit are configured as a microwave chip in an integrated circuit configuration.

17. The tamper resistant microwave detection module of any one of claims 13 to 16 wherein the tamper resistant microwave detection module includes a circuit substrate and a second reference ground plane carried on the same side of the circuit substrate as the microstrip transmission line in a spaced apart relationship therewith.