Rectangular waveguide dual-frequency common aperture antenna based on structure multiplexing

Abstract

The invention belongs to the technical field of a common aperture antenna, particularly relates to a rectangular waveguide dual-frequency common aperture antenna based on structure multiplexing and aims to solve problems of large antenna aperture occupation area of a conventional dual frequency common aperture array antenna and insufficient isolation between antennas. The antenna is advantaged inthat a closed structure of a rectangular waveguide is utilized, four rectangular waveguide antennas arranged at intervals of 90-DEG rotation in turn form a side wall of a back cavity type antenna, anda radiation gap is then opened at the center of a back cavity to form a back cavity slot antenna; the rectangular waveguide antennas and the back cavity slot antenna are respectively fed with signalsby an SIW waveguide feed structure and a strip line feed structure, dual-frequency radiation under rectangular waveguide structure multiplexing is realized, the antenna elements have no extra distance, the antenna aperture area is reduced, and the frequency ratio can be adjusted between 1 and 4, moreover, cut-off characteristics of the metal waveguide for the low frequency and orthogonal polarization characteristics of two frequency antennas greatly increase the isolation degree between the antennas, and thereby the higher isolation effect is realized.

Description

Technical field [0001] The invention belongs to the technical field of common-aperture antennas, and is specifically a rectangular waveguide dual-frequency common-aperture antenna based on structural multiplexing. Background technique [0002] The traditional common-aperture antenna is a form of antenna that allows multiple frequency bands and multiple polarized antennas to work in the same aperture plane at the same time; this antenna generally uses a reasonable spatial arrangement of antenna elements and feeder networks. The topology layout makes full use of the carrier space and reduces mutual interference between antennas of different frequency bands, so that multiple antennas with different implementation functions can work independently; and, compared with multiple antennas placed separately, a common-aperture antenna On the premise of not significantly increasing the size and weight of the antenna, the space occupied by the antenna is greatly saved. Therefore, the demand ...

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Problems solved by technology

For example, the literature "Z.Sun, S.S.Zhong, L.B.Kong, C.Gao, W.Wang, and M.P.Jin, "Dual-band dual-polarized microstrip array with fractional frequency ration", Electronics Lett., vol.48, no. 12, pp.674-676, Jun.2012", the S and X frequency bands adopt the form of microstrip patch antenna and slot antenna respectively, and the radiating elements of different frequencies are interlaced, resulting in a large area occupied by the antenna aperture; and different The frequency antennas are isolated only by their spatial positions, making the isolation between antennas relatively low

[0004] As another example, the literature "F.Qin, S.Gao, Q.Luo, C.X.Mao, C.Gu, G.Wei, J.D.Xu, J.Z.Li, C.Y.Wu, K.S.Zheng, and S.F.Zheng" A simple low-cost shared -aperture dual-band dual-polarized high-gain antenna for synthetic aperture radars", IEEETrans.Antennas Propag., v ol.64, no.7, pp.2914-2922, Jul.2016", C and X-band antennas They all adopt the form of patch antennas, and the radiating elements of different frequencies are also staggered, and the antenna aperture occupies a large area; in addition, although the FSS (Frequency Selective Surface) structure is introduced in the antenna design to improve the isolation between different frequency antennas, But still can't meet the technical needs

[0005] It can be found that when the ratio of the operating frequency of the dual-frequency common-aperture antenna is between 1 and 4, the existing scheme of interleaving the radiation units of different frequency antennas leads to the gap between the antenna units, resulting in a smaller occupied area of ​​the world’s aperture. Large, the influence of mutual coupling between antennas is more obvious, and the isolation between antennas in different frequency bands is not enough to meet the technical requirements

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