A Rectangular Waveguide Dual-frequency Common Aperture Antenna Based on Structure Multiplexing

Abstract

The invention belongs to the technical field of common-aperture antennas, and specifically provides a rectangular waveguide dual-frequency common-aperture antenna based on structural multiplexing, which is used to overcome the large area occupied by antenna apertures and the isolation between antennas in the design of traditional dual-frequency common-aperture array antennas. Insufficient problem. The present invention utilizes the closed structure of the rectangular waveguide, and four rectangular waveguide antennas rotated 90° sequentially to form the side wall of the cavity-backed antenna together, and then a radiation slot is opened at the center of the cavity to form the cavity-backed slot antenna; the SIW waveguide is used to feed The electrical structure and the stripline feed structure respectively feed signals to the rectangular waveguide antenna and the cavity-backed slot antenna to realize dual-frequency radiation under the multiplexing of the rectangular waveguide structure. There is no extra distance between the antenna elements, and the area occupied by the antenna aperture is reduced. And the frequency ratio can be adjusted between 1 and 4; at the same time, the low-frequency cut-off characteristics of the metal waveguide and the orthogonal polarization characteristics of the two frequency antennas greatly improve the isolation between the antennas, thereby achieving a high isolation effect.

Description

technical field [0001] The invention belongs to the technical field of common-aperture antennas, in particular to a rectangular waveguide dual-frequency common-aperture antenna based on structural multiplexing. Background technique [0002] The traditional co-aperture antenna is an antenna form that allows multiple antennas with multiple frequency bands and multiple polarizations to work in the same aperture plane at the same time; The topological layout makes the carrier space fully utilized and reduces the mutual interference between antennas in different frequency bands, so that multiple antennas with different functions can work independently; On the premise of not obviously increasing the size and weight of the antenna, the space occupied by the antenna is greatly saved. Therefore, in recent years, the demand for common-aperture antennas has been increasing, and they are mostly used in radar detection, measurement and other fields. [0003] Based on the above backgrou...

AI Technical Summary

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

Images