Method for broadening bandwidth of waveguide slot non-resonant array antenna

Abstract

The invention discloses a method for broadening the bandwidth of a waveguide slot non-resonant array antenna. The method mainly solves the problem that an existing waveguide slot non-resonant array antenna is narrow in working band. The implementation scheme is as follows: selecting two working frequency points fr1 and fr2 of which the frequencies are staggered from each other in the working frequency band of the antenna; changing an array element of the waveguide slot non-resonant array antenna from an existing single slot into double slots of which the resonant frequencies are fr1 and fr2 respectively, namely, two sets of crack arrays with different resonant frequencies are designed on the same waveguide aperture surface according to a known waveguide crack array antenna design method and formula to broaden the bandwidth of the antenna, and a distance fd is arranged between array elements of the two sets of crack arrays, so that the two sets of crack arrays do not interfere with eachother. The bandwidth of the waveguide slot non-resonant array antenna can be effectively broadened, and the method can be used for designing the waveguide slot non-resonant array antenna.

Description

technical field [0001] The invention belongs to the field of radar antennas, in particular to a method for widening the bandwidth of the antenna, which can be used in the design of waveguide slot non-resonant array antennas. Background technique [0002] The surface field distribution of the waveguide slot array antenna can be precisely controlled, and it is easy to achieve the requirements of high efficiency, high gain, extremely low sidelobe, narrow beam and shaped beam; and its feed system and radiation system are integrated, so that it has Low profile characteristics; the above-mentioned characteristics of the waveguide slot array antenna make it widely used in the field of radar, especially in space radar. [0003] With the emergence of complex electromagnetic environments such as electronic interference, in order to improve the adaptability of radar to electromagnetic environments, a series of anti-interference technologies such as frequency conversion and frequency mo...

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Problems solved by technology

However, this method of reducing the width of the crack can only broaden the bandwidth of the waveguide crack non-resonant array antenna to a certain extent. When the antenna requires a wider operating frequency band, this method cannot meet the needs

[0007] The second is to widen the bandwidth of the antenna by filling the medium near the crack with the dielectric loading method. The disadvantage of this method is that it increases the dielectric loss and reduces the antenna efficiency.

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