Circularly polarized spaceborne antenna based on 3dB bridge and spaceborne phased array

Abstract

The invention discloses a circularly polarized spaceborne antenna based on a 3dB bridge and a spaceborne phased array. A first metal patch is arranged between a feed layer and a dielectric layer; the feed layer is provided with a 3dB coupling bridge, the output end of the 3dB coupling bridge is connected with the first metal patch, and the 3dB coupling bridge is used for circularly polarizing an input signal and transmitting the circularly polarized signal to the dielectric layer; the dielectric layer is used for widening the bit width of the circularly polarized signal and radiating the widened circularly polarized signal outwards; the beneficial effects of the invention are that in the required working frequency band, the axial ratio is lower than 3dB, the standing wave is lower than 1.5, the beam width at the working frequency point is greater than 90 degrees, and the low profile is satisfied; circular polarization is realized in a forced feed mode, and the double-feed mode enables the circular polarization bandwidth to be broadened greatly compared with a common single-feed mode. The radiation leakage of the back surface is reduced, and the normal gain of the antenna and the gain during large scanning angle scanning are improved.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a circularly polarized space-borne antenna and a space-borne phased array based on a 3dB electric bridge. Background technique [0002] In recent years, in the field of satellite communication, in order to achieve effective coverage of specific areas of the earth, the EIRP (Effective Isotropic Radiated Power) of the phased array is improved to achieve less interference from adjacent cells, and the satellite-borne phase The unit antenna design of the control array antenna puts forward strict requirements, and there are great limitations in terms of antenna size, bandwidth, and axial ratio. [0003] In a satellite communication system, the type of antenna is limited. The commonly used microstrip antenna can easily meet the low-profile characteristics, but the signal transmitted by the antenna cannot meet the requirements of beam width and axial ratio bandwidth. Therefore, the used...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the antenna of the prior art, when the microstrip antenna meets the low-profile characteristics, the transmission signal beam width and the axial ratio bandwidth cannot meet the requirements, and the purpose is to provide a 3dB bridge-based Circularly polarized space-borne antennas and space-borne phased arrays can enable microstrip antennas to achieve wide beams, wide-axis ratio bandwidths, and low-profile characteristics within the operating frequency band

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