Circularly polarized microwave radar with compact structure
By adopting the axisymmetric layout and circular polarization method of transmitting components and receiving components in microwave radar, the problem of insufficient compactness and multipath effect of microwave radar structure is solved, efficient polarization and isolation are achieved, and detection performance is improved.
Patent Information
- Application Number
- CN202422056457.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-23
AI Technical Summary
The existing microwave radar is not compact enough, affecting the isolation and polarization efficiency of transmission and reception, and has a multipath effect, resulting in limited detection accuracy and distance.
The transmitting component and the receiving component are arranged on the radar board in an axisymmetric layout. The transmitting component and the receiving component adopt a circular polarization method. The receiving component only receives circular polarization waves rotating opposite to the transmitting component. Through the complementary arrangement of the transmitting radiation element and the receiving radiation element, the multipath effect is reduced and the polarization efficiency and isolation are improved.
A circularly polarized microwave radar with a compact structure is realized, which reduces the multipath effect, improves polarization efficiency and isolation, and improves detection accuracy and distance.
Smart Images
Figure CN223092131U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of radar technology, and particularly to a compact circularly polarized microwave radar. Background Art
[0002] Microwave radar is a technology that uses microwave signals for target detection, ranging, and imaging. Since the early 20th century, microwave radar has played an important role in military, aviation, aerospace, meteorology, transportation, and civilian fields. Microwave radar emits electromagnetic wave signals through a transmitting antenna, and the receiving antenna receives the signals reflected from the target object. After mixing the transmitted signal and the received signal, an intermediate frequency signal is obtained, and subsequent signal processing is performed to obtain the distance, speed, and other characteristics of the target. Among them, the performance of microwave radar depends to a large extent on the polarization state of the electromagnetic waves it emits and the ability of the receiving end to identify the polarization state. In existing microwave radars, in order to achieve a compact microwave radar system, a common transceiver linear polarization antenna is usually used, which will reduce the polarization efficiency between the transceiver. Moreover, the electromagnetic waves emitted by the linear polarization antenna are reflected and scattered multiple times by objects such as the ground, buildings, and water bodies, generating multiple signal propagation paths. The signals of different paths are superimposed on each other to cause interference, forming a multipath effect, which affects the detection accuracy. Therefore, solving the problems of low polarization efficiency and multipath effect between the transceiver of microwave radar is of great significance for improving the detection range of microwave radar.
[0003] To solve the above problems, the measures taken by existing microwave radars include:
[0004] First, in order to achieve miniaturization and compact structure of the microwave radar, for a 1T1R microwave radar with one transmitter and one receiver, a common transceiver patch antenna is usually used. In the design of the common transceiver antenna, the transmitted signal may be directly coupled to the receiving end, thus affecting the isolation between the transceiver. Therefore, in order to improve the isolation between the transceiver ports of the microwave radar, the method of orthogonal polarization is usually adopted; although this method can effectively improve the port isolation, it will reduce the polarization efficiency between the ports, thus affecting the overall performance of the radar system, especially in high-sensitivity application scenarios.
[0005] Second, in order to increase the detection range of the microwave radar, co-directional linear polarization transceiver antennas are usually used. Although this kind of antenna can improve the polarization efficiency, there is still a multipath effect.
[0006] Thirdly, in terms of the transmitter and receiver: Increasing the power of the transmitted signal can directly increase the energy of the electromagnetic waves emitted by the radar, enabling the target to be detected at a greater distance. However, this may lead to a significant increase in the costs of the transmitting and receiving systems, and high-power component systems require better power amplifiers (PAs) or the use of power combining techniques. In addition, transmitting high-power electromagnetic waves may interfere with surrounding electronic devices and communication systems, resulting in the need to design more stringent electromagnetic compatibility for the microwave radar system. For the receiver, a better-performing low-noise amplifier (LNA) is required to improve the signal-to-noise ratio, etc. However, high-performance LNAs require more complex radio frequency circuit designs, which is not conducive to the compactness of the radar module.
[0007] Fourthly, in terms of signal processing: Adaptive filtering algorithms need to be used to reduce multipath effects, and advanced digital signal processing algorithms need to be used to improve the detection range, etc. This increases the complexity of the algorithm design of the radar system and the maintenance cost is relatively high.
[0008] Fifthly, in terms of system composition: The combination of machine learning and electromagnetic fields can be used for research to achieve trajectory prediction and error compensation, thereby improving the detection ability and resolution of microwave signals. However, machine learning requires collecting data sets to train a model and complex machine learning algorithms such as YOLO and convolutional neural networks. Summary of the Utility Model
[0009] The present application provides a compact circularly polarized microwave radar, which is used to solve the technical problem that the structure of the existing microwave radar is not compact enough, affecting the isolation degree and polarization efficiency of signal transmission and reception.
[0010] To achieve the above object, the present application provides the following technical solutions:
[0011] On the one hand, a compact circularly polarized microwave radar is provided, which includes a radar board, a transmitting component, and a receiving component. The transmitting component and the receiving component are arranged in an axially symmetric layout on the radar board. The transmitting component includes a transmitting radiation element arranged on the first end face of the radar board, and the transmitting radiation element is used to transmit circularly polarized waves in a circular polarization manner; the receiving component includes a receiving radiation element arranged on the first end face of the radar board, and the receiving radiation element is used to receive circularly polarized waves with a rotation direction opposite to that of the transmitting radiation element.
[0012] Preferably, the transmitting component further includes a transmitting transmission line, and correspondingly, the receiving component further includes a receiving transmission line. The radar board is provided with a transmitting via hole and a receiving via hole; the transmitting transmission line is connected to the transmitting radiation element through the transmitting via hole, and the receiving transmission line is connected to the receiving radiation element through the receiving via hole.
[0013] Preferably, both the transmitting transmission line and the receiving transmission line are microstrip lines with single-point feeding.
[0014] Preferably, the transmitting transmission line is connected to the transmitting connection end of the radar control module.
[0015] Preferably, the receiving transmission line is connected to the receiving connection end of the radar control module.
[0016] Preferably, the radar board includes a core board, a first prepreg sheet disposed on the upper end surface of the core board, and a second prepreg sheet disposed on the lower end surface of the core board. The first prepreg sheet serves as the first end face of the radar board.
[0017] Preferably, the transmitting radiation element is a transmitting radiation patch antenna, and the receiving radiation element is a receiving radiation patch antenna; and / or, both the transmitting radiation patch antenna and the receiving radiation patch antenna are circularly polarized antennas.
[0018] Preferably, the transmitting component and the receiving component are arranged in a diagonal, left-right or up-down axisymmetric layout on the radar board.
[0019] Preferably, the shapes of both the transmitting radiation element and the receiving radiation element are triangular, L-shaped or semi-circular.
[0020] Preferably, the operating frequency bands of both the transmitting radiation element and the receiving radiation element are 5.725 GHz to 5.875 GHz.
[0021] The compact circularly polarized microwave radar includes a radar board, a transmitting component and a receiving component. The transmitting component and the receiving component are arranged in an axisymmetric layout on the radar board. The transmitting component includes a transmitting radiation element disposed on the first end face of the radar board, and the transmitting radiation element is used to transmit circularly polarized waves in a circularly polarized manner; the receiving component includes a receiving radiation element disposed on the first end face of the radar board, and the receiving radiation element is used to receive circularly polarized waves with a rotation direction opposite to that of the transmitting radiation element.
[0022] It can be seen from the above technical solutions that the present application has the following advantages: The compact circularly polarized microwave radar adopts an axisymmetric layout of the transmitting component and the receiving component on the radar board, achieving the structural compactness of the circularly polarized microwave radar; by enabling the receiving radiation element to effectively receive only circularly polarized waves with a rotation direction opposite to that of the transmitting radiation element, the multipath effect is reduced, and the polarization efficiency and isolation of the compact circularly polarized microwave radar are improved, solving the technical problems of the existing microwave radar having an insufficiently compact structure, which affects the isolation and polarization efficiency of signal transmission and reception. Description of the Drawings
[0023] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.
[0024] Figure 1 Schematic three-dimensional structure diagram of the compact circularly polarized microwave radar described in the embodiments of the present application;
[0025] Figure 2 Schematic framework diagram of the connection between the compact circularly polarized microwave radar described in the embodiments of the present application and the radar control module;
[0026] Figure 3 Schematic left view structure diagram of the compact circularly polarized microwave radar described in the embodiments of the present application;
[0027] Figure 4 Layer structure diagram of the compact circularly polarized microwave radar described in the embodiments of the present application;
[0028] Figure 5 Schematic curve diagram of the simulated scattering parameters S11 and S22 of the compact circularly polarized microwave radar described in the embodiments of the present application;
[0029] Figure 6 Schematic curve diagram of the simulated scattering parameters S21 and S12 of the compact circularly polarized microwave radar described in the embodiments of the present application;
[0030] Figure 7 Left-hand circular polarization axial ratio gain diagram of the compact circularly polarized microwave radar described in the embodiments of the present application;
[0031] Figure 8 Right-hand circular polarization axial ratio gain diagram of the compact circularly polarized microwave radar described in the embodiments of the present application. Detailed implementation manners
[0032] To make the invention purpose, features, and advantages of the present application more obvious and understandable, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the embodiments described below are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.
[0033] In the description of the embodiments of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.
[0035] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.
[0036] Term Explanation:
[0037] Polarization is an important characteristic of electromagnetic waves. Polarization describes the spatial orientation of the electric field vector in an electromagnetic wave as it changes over time.
[0038] Polarization matching means that when the maximum pointing direction of the antenna gain is aligned, the receiving antenna can only receive electromagnetic waves with the same polarization as the transmitting antenna, which is called polarization matching.
[0039] Polarization efficiency refers to the ratio of the power received by the receiving antenna to the power received by the receiving antenna under the conditions of the same direction, the same intensity, and polarization matching.
[0040] The multipath effect refers to the phenomenon that when a wireless signal propagates, it encounters obstacles and is reflected, refracted, or scattered, resulting in the receiving end receiving signals from multiple paths. These signals may interfere with each other, causing phase shifts and amplitude changes, thereby affecting the communication quality.
[0041] The polarization rotation direction refers to the trajectory of the end point of the electric field vector being a circle in a plane perpendicular to the propagation direction (the direction of the electric field vector rotates while the amplitude remains unchanged); when observing along the propagation direction, if the electric field vector rotates clockwise, it is called a left-handed circularly polarized wave; if the electric field vector rotates counterclockwise, it is called a right-handed circularly polarized wave.
[0042] The embodiment of the present application provides a compact circularly polarized microwave radar, which solves the technical problems that the structure of the existing microwave radar is not compact enough, affecting the isolation and polarization efficiency of transmission and reception.
[0043] Figure 1 It is a schematic three-dimensional structure diagram of the compact circularly polarized microwave radar described in the embodiment of the present application.
[0044] As Figure 1 shown, the embodiment of the present application provides a compact circularly polarized microwave radar, including a radar board, a transmitting component, and a receiving component. The transmitting component and the receiving component are arranged in an axially symmetric layout on the radar board. The transmitting component includes a transmitting radiation element 1t disposed on the first end surface of the radar board, and the transmitting radiation element 1t is used to transmit circularly polarized waves in a circular polarization manner; the receiving component includes a receiving radiation element 1r disposed on the first end surface of the radar board, and the receiving radiation element 1r is used to receive circularly polarized waves with a polarization rotation direction opposite to that of the transmitting radiation element.
[0045] It should be noted that the receiving radiation element 1r of the compact circularly polarized microwave radar can only effectively receive circularly polarized waves with the same polarization direction as it (that is, with a polarization rotation direction opposite to that of the transmitting radiation element 1t), reducing the multipath effect and improving the antenna polarization efficiency of the compact circularly polarized microwave radar. In contrast, in a multipath environment, the linearly polarized antenna of the existing microwave radar is prone to multipath effects when transmitting and receiving electromagnetic waves, while the compact circularly polarized microwave radar adopts a transmitting radiation element 1t and a receiving radiation element 1r in a circular polarization manner, which can effectively reduce the multipath effect between the transmitted and received signals and improve the polarization efficiency between the transmitting and receiving antennas.
[0046] In the embodiment of the present application, the transmitting radiation element 1t can be selected as a transmitting radiation patch antenna, and the receiving radiation element 1r can be selected as a receiving radiation patch antenna. Preferably, both the transmitting radiation patch antenna and the receiving radiation patch antenna are selected as circularly polarized antennas.
[0047] It should be noted that if the polarization rotation direction of the circularly polarized wave transmitted by the transmitting radiation element 1t is a left-handed circularly polarized wave, then the polarization rotation direction of the circularly polarized wave received by the corresponding receiving radiation element 1r is a right-handed circularly polarized wave. If the polarization rotation direction of the circularly polarized wave transmitted by the transmitting radiation element 1t is a right-handed circularly polarized wave, then the polarization rotation direction of the circularly polarized wave received by the corresponding receiving radiation element 1r is a left-handed circularly polarized wave.
[0048] In the embodiment of the present application, the transmitting component and the receiving component are arranged in a diagonal, left-right or up-down axisymmetric layout on the radar board. The shapes of the transmitting radiation element 1t and the receiving radiation element 1r can both be triangular, L-shaped or semi-circular.
[0049] It should be noted that in order to make the compact circularly polarized microwave radar achieve structural compactness and high antenna polarization efficiency, the transmitting component and the receiving component are arranged in an axisymmetric layout on the radar board, reducing the problems of using a complex antenna structure and non-compact structure in traditional microwave radars to improve the detection range; the shapes of the transmitting radiation element 1t and the receiving radiation element 1r are set to be triangular, L-shaped or semi-circular and arranged in a complementary manner. Two complementary transmitting radiation element 1t and receiving radiation element 1r, these two patch antenna elements are placed at the diagonal positions of the radar board, as Figure 1 shown; by setting the transmitting radiation element 1t and the receiving radiation element 1r to emit and receive circularly polarized waves in different circular polarization forms, the polarization efficiency of the compact circularly polarized microwave radar is improved. For example, if the transmitting radiation element 1t emits left-handed circularly polarized waves, then the receiving radiation element 1r receives right-handed circularly polarized waves; if the transmitting radiation element 1t emits right-handed circularly polarized waves, then the receiving radiation element 1r receives left-handed circularly polarized waves. Preferably, the transmitting radiation element 1t and the receiving radiation element 1r are arranged in a diagonal axisymmetric layout on the radar board.
[0050] A compact circularly polarized microwave radar provided by the present application includes a radar board, a transmitting component and a receiving component. The transmitting component and the receiving component are arranged in an axisymmetric layout on the radar board. The transmitting component includes a transmitting radiation element arranged on the first end face of the radar board, and the transmitting radiation element is used to emit circularly polarized waves in a circular polarization manner; the receiving component includes a receiving radiation element arranged on the first end face of the radar board, and the receiving radiation element is used to receive circularly polarized waves with a rotation direction opposite to that of the transmitting radiation element. This compact circularly polarized microwave radar adopts an axisymmetric layout of the transmitting component and the receiving component on the radar board to achieve the structural compactness of the circularly polarized microwave radar; by enabling the receiving radiation element to effectively receive only circularly polarized waves with a rotation direction opposite to that of the transmitting radiation element, the multipath effect is reduced, and the polarization efficiency and isolation of this compact circularly polarized microwave radar are improved, solving the technical problems that the structure of the existing microwave radar is not compact enough, affecting the isolation and polarization efficiency of transmission and reception.
[0051] As Figure 1 shown, in an embodiment of the present application, the radar board includes a core board 4, a first prepreg 3 arranged on the upper end face of the core board 4, and a second prepreg 2 arranged on the lower end face of the core board 4; the first prepreg 3 serves as the first end face of the radar board.
[0052] It should be noted that the core board 4 is arranged between the second prepreg 2 and the first prepreg 3. The core board 4, the first prepreg 3 and the second prepreg 2 form a circuit board as the radar board.
[0053] As Figure 1 shown, in an embodiment of the present application, the transmitting assembly further includes a transmitting transmission line 6t, and the corresponding receiving assembly further includes a receiving transmission line 6r. Transmitting via vias 5t and receiving via vias 5r are formed on the radar board; the transmitting transmission line 6t is connected to the transmitting radiation element 1t through the transmitting via vias 5t, and the receiving transmission line 6r is connected to the receiving radiation element 1r through the receiving via vias 5r.
[0054] It should be noted that both the transmitting transmission line 6t and the receiving transmission line 6r are microstrip lines with single-point feeding. In this embodiment, the transmitting radiation element 1t and the receiving radiation element 1r are complementary and diagonally arranged on the first prepreg 3, and the transmitting transmission line 6t and the receiving transmission line 6r are arranged on the second prepreg 2. The transmitting radiation element 1t, the receiving radiation element 1r and the radar board form a compact circularly polarized microwave radar with a four-layer PCB structure.
[0055] Figure 2 It is a schematic frame diagram of the connection between the compact circularly polarized microwave radar described in the embodiment of the present application and the radar control module.
[0056] As Figure 1 and Figure 2 shown, in an embodiment of the present application, the transmitting transmission line 6t is connected to the transmitting connection end of the radar control module 10; the receiving transmission line 6r is connected to the receiving connection end of the radar control module 10.
[0057] It should be noted that the transmitting connection end and the receiving connection end of the radar control module 10 are respectively connected to the transmitting transmission line 6t and the receiving transmission line 6r, and then are respectively connected to the corresponding transmitting radiation element 1t and receiving radiation element 1r through the transmitting via vias 5t and receiving via vias 5r to form a compact circularly polarized microwave radar with circularly polarized transmitting and receiving functions.
[0058] In an embodiment of the present application, the operating frequency bands of both the transmitting radiation element 1t and the receiving radiation element 1r are 5.725 GHz to 5.875 GHz.
[0059] It should be noted that the operating frequency bands of the transmitting radiation element 1t and the receiving radiation element 1r of the compact circularly polarized microwave radar are set to 5.725 GHz to 5.875 GHz, so that the compact circularly polarized microwave radar meets the performance requirements of the antenna in the 5.8 GHz microwave radar system, where the operating frequency band is 5.725 GHz to 5.875 GHz and the isolation within the operating frequency band is better than 24 dB, and a certain bandwidth margin is reserved. This makes the compact circularly polarized microwave radar meet the design requirements of the antenna in the 5.8 GHz microwave radar. In this embodiment, when the reflection coefficient of the compact circularly polarized microwave radar is less than -10 dB, the bandwidth is 5.65 GHz to 5.924 GHz. The isolation degree of the transceiver connection end of the compact circularly polarized microwave radar is better than 24.9 dB, and the gain of the compact circularly polarized microwave radar is greater than 4.36 dB.
[0060] Figure 4 This is the layer structure diagram of the compact circularly polarized microwave radar described in the embodiment of the present application. Figure 5 This is a schematic curve diagram of the simulated scattering parameters S11 and S22 of the compact circularly polarized microwave radar described in the embodiment of the present application. Figure 6 This is a schematic curve diagram of the simulated scattering parameters S21 and S12 of the compact circularly polarized microwave radar described in the embodiment of the present application. Figure 7 This is the left-handed circular polarization axial ratio gain diagram of the compact circularly polarized microwave radar described in the embodiment of the present application. Figure 8 This is the right-handed circular polarization axial ratio gain diagram of the compact circularly polarized microwave radar described in the embodiment of the present application.
[0061] In the embodiment of the present application, from Figure 3 and Figure 4 it can be seen that the radar board includes layer 1, layer 2, layer 3, and layer 4 from top to bottom. Layer 1 is arranged above the first prepreg 3, layer 2 is an empty layer and is arranged between the first prepreg 3 and the core board 4, layer 3 is arranged between the second prepreg 2 and the core board 4, and layer 4 is arranged below the second prepreg 2. From Figure 5 it can be seen that the operating frequency band range of the receiving radiation element 1r and the transmitting radiation element 1t of the compact circularly polarized microwave radar is 5.65 GHz to 5.92 GHz. From Figure 6 it can be seen that the port isolation degree of the receiving radiation element 1r and the transmitting radiation element 1t of the compact circularly polarized microwave radar is better than 24.9 dB within the operating frequency band range. From Figure 4 and Figure 7It can be seen that when the compact circularly polarized microwave radar is excited at port1, the axial ratio bandwidth of the receiving radiation element 1r is 1.81% (5.75 GHz to 5.855 GHz), and the gain at 5.8 GHz is 4.36 dB, presenting left-handed circular polarization. From Figure 4 and Figure 8 It can be seen that when the compact circularly polarized microwave radar is excited at port2, the axial ratio bandwidth of the transmitting radiation element 1t is 1.84% (5.752 GHz to 5.859 GHz), and the gain at 5.8 GHz is 4.36 dB, presenting right-handed circular polarization.
[0062] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.
Claims
1. A compact circularly polarized microwave radar, characterized in that, It includes a radar board, a transmitting component, and a receiving component. The transmitting component and the receiving component are arranged in an axisymmetric layout on the radar board. The transmitting component includes a transmitting radiation element disposed on the first end face of the radar board, and the transmitting radiation element is used to transmit a circularly polarized wave in a circular polarization manner; the receiving component includes a receiving radiation element disposed on the first end face of the radar board, and the receiving radiation element is used to receive a circularly polarized wave with a rotation direction opposite to that of the transmitting radiation element.
2. The compact circularly polarized microwave radar according to claim 1, characterized in that, The transmitting component further includes a transmitting transmission line, and correspondingly, the receiving component further includes a receiving transmission line. Transmitting via holes and receiving via holes are provided on the radar board; the transmitting transmission line is connected to the transmitting radiation element through the transmitting via hole, and the receiving transmission line is connected to the receiving radiation element through the receiving via hole.
3. The compact circularly polarized microwave radar according to claim 2, characterized in that, Both the transmitting transmission line and the receiving transmission line are microstrip lines with single-point feeding.
4. The compact circularly polarized microwave radar according to claim 2, characterized in that, The transmitting transmission line is connected to the transmitting connection end of the radar control module.
5. The compact circularly polarized microwave radar according to claim 4, wherein The receiving transmission line is connected to the receiving connection end of the radar control module.
6. The compact circularly polarized microwave radar according to any one of claims 1-5, characterized in that, The radar board includes a core board, a first prepreg disposed on the upper end face of the core board, and a second prepreg disposed on the lower end face of the core board. The first prepreg serves as the first end face of the radar board.
7. The compact circularly polarized microwave radar according to any one of claims 1-5, characterized in that, The transmitting radiation element is a transmitting radiation patch antenna, and the receiving radiation element is a receiving radiation patch antenna; and / or, both the transmitting radiation patch antenna and the receiving radiation patch antenna are circularly polarized antennas.
8. The compact circularly polarized microwave radar according to any one of claims 1-5, characterized in that, The transmitting component and the receiving component are arranged in a diagonal, left-right, or up-down axisymmetric layout on the radar board.
9. The compact circularly polarized microwave radar according to any one of claims 1-5, characterized in that, The shapes of both the transmitting radiation element and the receiving radiation element are triangular, L-shaped, or semi-circular.
10. The compact circularly polarized microwave radar according to any one of claims 1-5, characterized in that, The operating frequency bands of both the transmitting radiation element and the receiving radiation element are 5.725 GHz to 5.875 GHz.