Circularly polarized PIFA antenna with high-stability phase center and GPS positioning system

Abstract

The invention belongs to the technical field of a wireless communication system and discloses a circularly polarized PIFA antenna with a high-stability phase center and a GPS positioning system. The antenna comprises a feed structure and a radiation structure, wherein the radiation structure comprises eight rectangular metal sheets and a metal column which are printed on an upper layer of a circular FR4 dielectric plate, the feed structure comprises a three-stage Wilkinson power division phase shifter and four coaxial lines which are printed on a lower layer of a rectangular FR4 dielectric plate, ports of the power divider excite the PIFA antenna to radiate energy through feed probes, and circular polarization performance and the relatively stable phase center of the antenna are realized by designing the symmetrical antenna structure, the symmetrical four-point uniform feed structure and four symmetrical feed points. The end-fire antenna has characteristics of radiation circular polarization, high stable phase center, low profile, light weight, easiness in processing and the like, and has a wide application prospect in the field of novel circular polarization PIFA antennas.

Description

technical field [0001] The invention belongs to the technical field of wireless communication systems, and in particular relates to a highly stable phase center circularly polarized PIFA (inverted F) antenna and a GPS positioning system. Background technique [0002] At present, the closest existing technology: With the rapid development of wireless communication systems, satellite navigation and positioning technology also develops rapidly. There are 4 mature navigation systems, of which the Global Positioning System (Global Positioning System, GPS) uses GPS positioning satellites to perform real-time positioning and navigation around the world, providing low-cost, high-precision three-dimensional position, speed and accuracy for global users. Navigation information such as timing is a model of the application of satellite communication technology in the field of navigation. The GPS receiving frequency band is generally the L1 frequency band, that is, 1575.42MHz, and the w...

AI Technical Summary

Problems solved by technology

[0007] In summary, the existing problems in the prior art are: when circularly polarized PIFA antennas are used in wireless communication systems and global positioning systems, their achievable impedance and axial ratio bandwidth are not large enough, and the circularly polarized PIFA antenna design There are few antenna systems for GPS receiving frequency band (L1 frequency band, ie 1575.42MHz)

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