Dual-band/dual-polarization CTS antenna based on 3D orthogonal shunt-fed network

Abstract

The invention discloses a dual-band/dual-polarization CTS antenna based on a 3D orthogonal shunt-feed network. The dual-band/dual-polarization CTS antenna comprises a first-stage feed network, a second-stage feed network and a radiator, the I-level feed network comprises two transmission channels, the transmission channels are used for converting point source signals into line source signals, and the two line source signals output by the two transmission channels are orthogonal; the second-stage feed network is used for converting two paths of orthogonal line source signals into two orthogonal 2D line source array signals, the radiator is used for radiating the two orthogonal 2D line source array signals to a free space, and the radiator comprises a low-loss dielectric layer for supporting and a first prismatic table in a rectangular array; the row gaps and the column gaps among the four adjacent first prismatic tables forming the rectangular shape form a cross-shaped radiation unit. A high-isolation two-stage orthogonal shunt-feed structure and a dual-band/dual-polarization common aperture radiator are adopted, excitation of two independent ports and two independent channels are achieved, dual-band electromagnetic signals are converted from a point source to a 2D line source array, the structure is compact, and the size is small.

Description

technical field [0001] The invention relates to a dual-band / dual-polarized antenna technology, in particular to a dual-band / dual-polarized CTS antenna based on a 3D orthogonal parallel feed network. Background technique [0002] As the key node of information transmission and exchange, antenna plays the role of bridge in modern communication. In various communication systems, the requirements for the indicators and types of antennas are different, and these are often related to carrier platforms, communication protocols, and application scenarios. [0003] In order to improve the anti-interference ability of the signal, the receiving and transmitting frequency bands of the mobile satellite communication system are often separated, and the satellite communication antenna must have dual-band / dual-polarization functions to provide independent receiving and transmitting channels with high isolation. [0004] In the field of ultra-wideband terrestrial communications, such as mil...

AI Technical Summary

Problems solved by technology

The disadvantage of this design is that the dual-band feed needs to integrate a polarization rotary joint or a circular polarizer, an orthogonal mode coupler OMT, etc., the structure is complex, the system cost is high, and the feed source irradiation will cause edge overflow loss

In addition, the antenna profile of the reflector is high, which is not suitable for high-mobility mobile communication applications

[0007] For example, a dual-band / dual-polarized antenna based on a waveguide slot is essentially a resonant antenna with a narrow bandwidth. It requires precision machining to ensure the processing accuracy of the slot, so as to ensure that no frequency shift occurs. The processing cost is high and the structure bulky

[0008] For example, dual-band / dual-polarized antennas based on horn arrays are difficult to design across frequency bands, have high cross-polarization, and are prone to problems such as lobes

One way to achieve dual-band / dual-polarization operation of the horn array is to use a square waveguide as the radiating element, which will result in a high cross-polarization of the radiation pattern.

In addition, if the receiving frequency band and the transmitting frequency band are far apart, such as the K / Ka frequency band, the size of the radiation unit is not well designed, and it is easy to generate lobes

[0009] Although the performance of the CTS antenna is excellent, it is essentially a single-polarization, single-band antenna. At present, there is no effective technical means to realize dual-band / dual-polarization CTS antennas.

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