UHF band strip line feed-based satellite-borne dual circularly polarized antenna

Abstract

The invention provides a UHF band strip line feed-based satellite-borne dual circularly polarized antenna which is high in isolation degree, can cover all directions and is simple in structure and light in weight, and belongs to the field of antenna design. The antenna comprises four groups of obliquely installed oscillator components, four wiring pins, an antenna circuit board and a feed network, wherein the four groups of the obliquely installed oscillator components are fixed on the four corners of the antenna circuit board respectively; four welding holes are formed in the antenna circuit board; the tail end of each group of the obliquely installed oscillator components is welded together with one welding hole through one wiring pin; the antenna circuit board is a multilayer board; and the feed network is arranged in the multilayer board. In the feed network, a mixer consisting of strip line segments is combined with a phase shifter to form dual channels with high isolation degree, so that the cross modulation problem possibly caused by sharing of the antenna by double transmitters is effectively suppressed; the combination of the two channels effectively realizes a circular polarization characteristic of the antenna; and wave beams basically can cover all the directions.

Description

technical field [0001] The invention relates to a dual circular polarization array antenna, which belongs to the field of antenna design. Background technique [0002] In the UHF (Ultra High Frequency, UHF) band satellite communication application, the antenna is usually required to have the performance characteristics of wide beam and circular polarization to meet the communication requirements, and as the carrying platform continues to become smaller, the antenna also needs to be constantly To meet the needs of miniaturization, the design is more compact, highly integrated and easy to install. [0003] The commonly used antenna design scheme in UHF band satellite communication is to install a helical antenna in the front and rear directions of the satellite to meet the requirements of omnidirectional circular polarization, but the helical antenna has a high radial direction and cannot meet the height-limited environment. demand, and the working efficiency of the antenna i...

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Problems solved by technology

[0003] The commonly used antenna design scheme in UHF band satellite communication is to install a helical antenna in the front and rear directions of the satellite to meet the requirements of omnidirectional circular polarization, but the helical antenna has a high radial direction and cannot meet the height-limited environment. demand, and the working efficiency of the antenna is low in this way; there are also some satellites that install whip antennas on the side to get a wider beam. Although this antenna has a simple structure, it cannot achieve circular polarization, and there will be some blind spots on the beam; Moreover, it is also difficult for the above two antennas to achieve dual polarization in the same frequency band. Although the microstrip antenna is easy to achieve dual circular polarization, it is too large in terms of UHF frequency band.

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