A device for improving the isolation of continuous wave radar transceiver antennas

Abstract

This invention relates to a device for improving the isolation of continuous wave radar transceiver antennas, comprising two waveguide slot array antennas, a metal baffle, a parasitic metal waveguide source, and a power divider feed network. The parasitic waveguide is located between the two waveguide slot antenna arrays, with an included angle between them. The waveguide slot array antennas are composed of multiple rows of parallel waveguide slot array sources, a waveguide coaxial converter, a phase-matching cable, and a power divider feed network. The load at the matching end of the transmitting antenna array is replaced by a power divider. This invention provides a device for improving the isolation of continuous wave radar transceiver antennas, effectively reducing the area and profile height of the continuous wave radar, achieving a transceiver isolation of -79dB within the operating bandwidth, laying the foundation for enhancing radar power and increasing radar range.

Description

Technical Field

[0001] This invention relates to the field of antennas, and in particular to a device for improving the isolation of continuous wave radar transceiver antennas. Background Technology

[0002] Continuous wave radar is widely used in short-range radar testing. Among the various indicators of continuous wave radar, the isolation between the transmitting and receiving channels is a key indicator in the design of continuous wave radar antennas. If the isolation is insufficient, it will weaken the radar's power, reduce the radar's effective range, and in severe cases, cause signal saturation in the receiving channel, rendering the radar system unable to work. Therefore, the design of the isolation between the transmitting and receiving antennas of continuous wave radar is particularly important in the design of continuous wave radar systems.

[0003] Common methods to improve the isolation between transmitting and receiving antennas in continuous wave radar include increasing the distance between the transmitting and receiving antennas and laying absorbing materials. However, these methods can lead to drawbacks such as an excessively large overall radar aperture and reduced antenna gain. Therefore, it is crucial to design a system that improves the isolation between transmitting and receiving antennas while reducing the overall size of the radar without compromising its power. Summary of the Invention

[0004] To address the aforementioned shortcomings, this application proposes a device for improving the isolation of continuous wave radar transceiver antennas, comprising: a waveguide slot array antenna, a metal baffle, a parasitic metal waveguide source, and a power divider feed network.

[0005] The parasitic metal waveguide source is disposed between two adjacent waveguide slot array antennas, and the two waveguide slot array antennas are provided with a certain included angle.

[0006] The waveguide slot array antenna includes multiple parallel waveguide slot array sources, waveguide coaxial converters, phase matching cables, and a power divider feed network. The transmitting antenna array matching end is equipped with a power divider.

[0007] In one possible implementation, the waveguide slot array antenna is made of aluminum and is manufactured using a stretching technique.

[0008] In one possible implementation, the number of row sources in the waveguide slot transmitting antenna array is the same as the number of phased cables.

[0009] In one possible implementation, the waveguide slot receiving antenna array column employs DBF beamforming.

[0010] In one possible implementation, the waveguide slot array antenna line source rows have equal spacing.

[0011] In one possible implementation, the waveguide coaxial converter has matching steps of varying heights inside.

[0012] In one possible implementation, the row spacing between the parasitic waveguide sources is equal to the row spacing of the waveguide slot array antenna.

[0013] In one possible implementation, there are choke slots between the parasitic waveguide sources.

[0014] In one possible implementation, a choke slot exists between the parasitic waveguide line source and the waveguide slot array antenna line source.

[0015] In one possible implementation, a choke slot is provided between the waveguide slot array antenna line sources.

[0016] Due to the application of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0017] (1) Waveguide slot antennas have the advantages of easy control of aperture field distribution, no energy leakage, high antenna aperture efficiency, stable performance, simple and compact structure, high strength, convenient installation, and strong wind resistance. Moreover, it is easy to achieve narrow beam, shaped beam and low sidelobe.

[0018] (2) Adding parasitic waveguide sources and metal plates between the transmitting and receiving antennas greatly reduces the distance between the transmitting and receiving antennas and the overall size of the radar compared with traditional methods to improve the transmission and receiving isolation; transmitting antenna array antenna line source;

[0019] (3) Install a choke between the transmitting and receiving antennas to improve the isolation between transmitting and receiving based on the periodic propagation characteristics of electromagnetic waves;

[0020] (4) The waveguide slot array antenna is manufactured using an integrated structure and aluminum waveguide stretching technology, which makes the structure compact and easy to install. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Attached Figure Description

[0023] Figure 1 This is a schematic block diagram of the transceiver antenna array embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the transmit / receive antenna array isolation device according to an embodiment of the present invention;

[0025] Figure 3 for Figure 2Isolation curve of the embodiment. Detailed Implementation

[0026] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0027] In order to achieve a minimized reconfigurable structure for photoconductive switches and improve the reliability and lifespan of switch operation, this application provides the following technical solutions.

[0028] Please see Figure 1 The preferred embodiment of the device for improving the isolation of continuous wave radar transceiver antennas of the present invention includes three waveguide slot array antennas, four parasitic metal waveguide sources, a metal baffle, a waveguide coaxial converter, a phased cable, and a power divider feed network. The load at the matching end of the transmitting antenna array is replaced by a power divider.

[0029] In a preferred embodiment of the present invention, there is a 22.5° angle between the transmitting antenna array and the receiving antenna array 1, and a 45° angle between the receiving antenna array 1 and the receiving antenna array 2; a parasitic metal waveguide source is loaded between the transmitting antenna array and the receiving antenna array 1.

[0030] In a preferred embodiment of the present invention, choke slots are present between the waveguide slot array antenna line sources, between the parasitic waveguide line sources, and between the parasitic waveguide line sources and the waveguide slot array antenna line sources.

[0031] In a preferred embodiment of the present invention, the parasitic waveguide source and the row spacing of the waveguide slot array antenna are equal.

[0032] In a preferred embodiment of the present invention, the waveguide coaxial converter has matching steps of different heights inside.

[0033] In a preferred embodiment of the present invention, the waveguide slot receiving antenna array uses DBF beamforming.

[0034] In a preferred embodiment of the present invention, the number of line sources in the waveguide slot transmitting antenna array is the same as that in the phased cable.

[0035] In a preferred embodiment of the present invention, the specific design implementation method is as follows: Figure 1As shown, the waveguide adopts a standard rectangular waveguide BJ-100, with 66 slot line sources per waveguide and a spacing of 20mm between each slot line source. The transmitting antenna array is connected to the power divider feed network via a phased cable, which is connected to the power divider feed network via a waveguide coaxial converter. The load at the matching end of the transmitting antenna array is replaced by a power divider. The transmitting antenna array and receiving antenna array 1 are connected via four parasitic metal waveguide line sources. There is a 22.5° angle between the transmitting antenna array and receiving antenna array 1, and a baffle is added above the choke slot between the transmitting antenna array and the waveguide line sources. There is a 45° angle between receiving antenna array 1 and receiving antenna array 2. The receiving antenna array uses DBF beamforming.

[0036] like Figure 2 As shown, the isolation device example includes 4 parasitic metal waveguide sources, 5 metal baffles, and a choke groove, with a 22.5° included angle between the transceiver modules.

[0037] It should be noted that the angles between receiving antenna array 1 and receiving antenna array 2, and the angle between transmitting antenna array and receiving antenna array 1, are...

[0038] Figure 3 yes Figure 2 The diagram shows the isolation curve of the transceiver antenna array in this embodiment. The horizontal axis represents frequency variation in GHz, and the vertical axis represents isolation in dB. As shown in the figure, the operating frequency band of the stacked antenna in this embodiment is 9.55–9.75 GHz, and the isolation of the transceiver antenna array is -79 dB.

[0039] This article uses specific examples to illustrate the inventive concept in detail. The description of the above embodiments is only for the purpose of helping to understand the core idea of ​​the present invention. It should be noted that any obvious modifications, equivalent substitutions or other improvements made by those skilled in the art without departing from the inventive concept should be included within the protection scope of the present invention.

[0040] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the foregoing claims.

[0041] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

[0042] It should be understood that "multiple" as used in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0043] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0044] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A device for improving the isolation of continuous wave radar transceiver antennas, characterized in that, The device includes: a waveguide slot array antenna, a metal baffle, a parasitic metal waveguide power source, and a power divider feed network; The waveguide slot array antenna consists of two receiving antenna arrays and one transmitting antenna array; The waveguide slot array antenna includes multiple parallel waveguide slot array sources, waveguide coaxial converters, phase matching cables, and a power divider feed network. The transmitting antenna array matching end is equipped with a power divider. The transmitting antenna array and the receiving antenna array have an angle of 22.5°, and the two receiving antenna arrays have an angle of 45°; a parasitic metal waveguide source is loaded between the transmitting antenna array and the receiving antenna array. Choke slots exist between the parasitic metal waveguide sources; A choke slot exists between the parasitic metal waveguide source and the waveguide slot array antenna source. A choke slot is provided between the antenna line sources of the waveguide slot array; The row spacing between the parasitic metal waveguide sources is equal to the row spacing of the waveguide slot array antenna.

2. The device for improving the isolation of continuous wave radar transceiver antennas as described in claim 1, characterized in that, The waveguide slot array antenna is made of aluminum and is manufactured using a stretching technique.

3. The device for improving the isolation of continuous wave radar transceiver antennas as described in claim 1, characterized in that, The number of line source rows in the transmitting antenna array is the same as the number of phase cables.

4. The device for improving the isolation of continuous wave radar transceiver antennas as described in claim 1, characterized in that, The receiving antenna array employs DBF beamforming.

5. The device for improving the isolation of continuous wave radar transceiver antennas as described in claim 1, characterized in that, The waveguide slot array antenna line source rows have equal spacing.

6. The device for improving the isolation of continuous wave radar transceiver antennas as described in claim 1, characterized in that, The waveguide coaxial converter has matching steps of different heights inside.

Images