Nested type Koch fractal Beidou dual-frequency micro-strip antenna

Abstract

The invention relates to a nested type Koch fractal Beidou dual-frequency micro-strip antenna which comprises a high dielectric constant dielectric substrate, a good conductor grounding reflection plate and an N type or sma national standard joint, a structural mode of copper axis feed is adopted, metal good conductors are coated on two faces of the high dielectric constant dielectric substrate, a nested type ring outer Koch fractal paster and a nested type ring inner Koch fractal paster are arranged on the upper surface of the high dielectric constant dielectric substrate, and a gap groove structure is arranged between the ring outer Koch fractal paster and the ring inner Koch fractal paster. A low-frequency stage feed hole is formed in the ring outer Koch fractal paster, a high-frequency stage feed hole is formed in the ring inner Koch fractal paster, and four gap grooves are formed in the good conductor grounding reflection plate. The nested type Koch fractal Beidou dual-frequency micro-strip antenna has the advantages of being novel in structure, small in size, good in radiation characteristic, small in effect of environment factor, low in cost, easy to integrate and the like, and can meet the requirement of a Beidou satellite communication system for an antenna.

Description

technical field [0001] The invention relates to a miniaturized Koch fractal structure high dielectric constant microstrip antenna used in a Beidou satellite dual-frequency point system. Background technique [0002] Since 2000, China has successfully launched 4 Beidou-1 navigation and positioning satellites and 7 Beidou-2 navigation and positioning satellites. As an indispensable part of the satellite communication system, the antenna directly determines the performance of the satellite communication system. my country's Beidou-2 satellite communication system works in the B1 and B3 frequency bands, the uplink (transmission frequency) L frequency band and the downlink (reception frequency) S frequency band. Dual-frequency or multi-frequency is usually used to compensate the delay caused by ionospheric propagation, which requires the antenna to have good working performance on each frequency. In addition, since satellite communication signals are circularly polarized waves,...

AI Technical Summary

Problems solved by technology

The antenna design requires miniaturization, but the antenna structure mentioned above has a square ring structure patch that is fed through coupling, and its performance is greatly affected by the external environment; secondly, the single-channel feed cannot meet the requirements of independent transmission and reception in two frequency bands

The present invention prepares the PBG structure on the ground plate of the novel antenna. At present, the nested structure, microstrip antenna fractal technology, photonic bandgap structure and double-feed design are combined, and the antenna design applied to the satellite system has not been reported yet.

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