High-integration efficient sum-difference beam waveguide antenna

Abstract

The invention discloses a high-integration efficient sum-difference beam waveguide antenna. The antenna mainly comprises an upper double-layer broadband microstrip planar antenna array, a lower double-layer broadband microstrip planar antenna array, a grounding plate with an inclined seam in the center, and an antenna system supporting structural member, wherein two sets of waveguides of BJ-180 specifications are processed on the antenna system supporting structural member, four sets of low-loss broadband coaxial waveguide conversions are adopted, a standard SMA interface can be conveniently adopted for feeding, a thin metal isolation strip is additionally arranged in the middle of the supporting structural member, the working waveband of the compact high-isolation low-sidelobe wide-angleelectric scanning transceiving double-antenna is a Ku waveband of 17.14-19.35 mm, and the central frequency lambda0 wavelength is 18.18 mm. The compact high-isolation low-sidelobe wide-angle electricscanning transceiving double antenna is compact in structure, high in isolation, light in weight and capable of achieving electric scanning, and a double-antenna array can be conveniently formed.

Description

technical field [0001] The invention relates to a highly integrated high-efficiency and differential beam waveguide antenna, which is used for fixed, vehicle-mounted low-altitude and ground low, slow, and small target search radars, and is also suitable for low-cost electric scanning radar systems and security monitoring systems, belonging to Antenna technology field. Background technique [0002] Portable reconnaissance radar can measure the azimuth, distance and activity route of targets such as personnel, vehicles and ships in a specific area, provide target activity information, and realize the alert of specific areas. It can be widely used in military and civilian fields. There are a variety of portable reconnaissance radars in active service at home and abroad, mainly including PPS-5D radar, SQUIRE radar, Lyra10 radar, RSR950Ngada radar, EL / M-2140 radar and ST-312 radar. [0003] As the key component of radar, antenna has great influence on radar performance. Accordi...

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Problems solved by technology

According to data query and analysis, the antenna used by the above-mentioned portable radar has the following deficiencies: (1) The antenna sidelobe is not low enough, which affects the detection effect: currently, due to low altitude and low, slow, and small targets on the ground, the weight and size of the antenna are too large, such as PPS -5D radar weighs 34.5 kg, SQUIRE radar weighs about 23 kg, Lyra10 radar weighs 25 kg, and RSR950Ngada radar weighs about 43.8 kg. The size of the antenna is very important to improve the performance of the radar; (2) the pitch direction of the antenna does not have the height measurement function: the antenna adopts a mechanical scanning system, such as PPS-5D radar, Lyra10 radar and EL / M-2140 radar, etc., the machine scanning system antenna makes Radar has slow beam scanning speed, high power consumption, and reduced reliability. The electronic scanning system antenna has the advantages of small size, flexible control, fast beam scanning and no inertia. However, in the microwave high frequency band, the active phased electronic scanning antenna used Core components such as digital phase shifters and T / R components are expensive, the system is complex and expensive, and it is difficult for ordinary users to receive; (3) the antenna itself has a fixed beam, or electronic scanning, and has a single function; (4) a single antenna is used for time-sharing transmission and reception : A considerable part of the existing portable reconnaissance radar adopts the pulse Doppler system, such as ST-312 radar and Lyra10 radar. This system radar has a large distance and speed blind zone, and it is difficult to observe slow and small targets in the near area. Frequency modulation continuous wave is used. The system can better solve this problem, but FM continuous wave radar generally needs to use two antennas to work at the same time, one transmits and one receives. means to improve the isolation between the receiving and transmitting antennas; (5) There are too many modules to realize the height measurement and scanning functions, the loss is large, and the cost is high

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