Broadband dual-frequency dual-circularly polarized reflectarray antenna with independently controllable beams

Abstract

The invention relates to the field of electronic devices for wireless communication systems, and discloses a broadband dual-frequency dual-circular polarization reflection array antenna with independently controllable beams, including a dual-band broadband circular polarization feed source and a planar reflection array, and a dual-band broadband circular polarization antenna. The feed source is placed near the focal plane of the planar reflector array. The planar reflector array includes low-frequency and high-frequency dual circularly polarized phase-shift units arranged alternately in a common aperture period. Each dual-circularly polarized phase-shift unit includes a circular patch Layer, metal formation with I-shaped gap etched, two microstrip line layers with different lengths and metal backplane layer, etc. The present invention combines the dynamic phase and the rotation phase, and realizes the simultaneous independent regulation of the left-handed phase and the right-handed phase in both the K-band and the Ka-band, and adopts the forms of cross-shaped gap processing and microstrip line gap coupling patches to ensure The ultimate dual-frequency broadband characteristics of the reflectarray antenna have the advantages of low profile, easy processing, easy integration and low cost, and have important application prospects in satellite communications and other fields.

Description

technical field [0001] The invention belongs to the field of electronic devices for wireless communication systems, and in particular relates to a broadband dual-frequency dual-circular polarization reflection array antenna with independently controllable beams. Background technique [0002] At present, the normal work of space probes usually depends on satellite communication, and the commonly used satellite communication frequency bands include C, K and Ka bands. Both K-band and Ka-band refer to a specific radio frequency range. K-band refers to radio waves with a frequency in the range of 18-26.5GHz, and Ka-band refers to radio waves with a frequency in the range of 26.5-40GHz. In order to achieve long-distance and stable communication requirements, it is usually necessary to use high-gain circularly polarized antennas at both the transmitting end and the receiving end of the communication, such as phased array antennas, reflector antennas, etc. [0003] The phased array...

AI Technical Summary

Problems solved by technology

The existing dual-frequency dual circularly polarized reflectarray antennas are divided into two categories, one is based on multi-functional layers, the upper layer is a dual-frequency line circular polarization converter, and the lower layer is a dual-frequency linearly polarized reflectarray antenna. The disadvantage is that there are many functional layers, complex structure, high profile, and narrow bandwidth; the other type is based on circuit implementation, and an orthogonal coupler is loaded under the dual-frequency radiator with a common aperture to realize dual-frequency dual circularly polarized reflective arrays. Antenna, its disadvantage is that the bandwidth is narrow and the frequency of dual frequency is relatively small

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