Double-frequency microstrip antenna

Abstract

The invention discloses a double-frequency microstrip antenna, which comprises an upper-layer microstrip antenna with an upper-layer paster, a lower- layer of microstrip antenna with a lower-layer paster and a feed network located at the bottom layer. The geometric center of the upper-layer paster is provided with an upper-layer central hole, the geometric center of the lower-layer paster is provided with a lower-layer central hole, the double-frequency microstrip antenna is also provided with a short circuit pin which is connected with an earth wire of the feed network after sequentially penetrating into the upper-layer microstrip antenna from the upper-layer central hole and penetrating into the lower-layer microstrip antenna from the lower-layer central hole, and the short circuit pin is respectively electrically connected with the upper-layer paster and the lower-layer paster. In the invention, through fixing the geometric center of the upper-layer paster and the geometric center of the lower-layer paster together and connecting the upper-layer paster and the lower-layer paster with the earth wire of the feed network by the short circuit pin, the invention can stabilize the phase centers of the two frequency-band signals received by the double-frequency microstrip antenna, thereby reducing signal error of the double-frequency microstrip antenna and improving the signal receiving precision of the double-frequency microstrip antenna.

Description

technical field [0001] The present invention relates to an antenna, in particular to a dual-frequency microstrip antenna. Background technique [0002] The dual-band microstrip antenna can be used as a measurement antenna to simultaneously receive signals from the L1 frequency band of GPS (Global Positioning System) and signals from the L2 frequency band of GLONASS (Global Navigation Satellite System). The system receiver can be used in geodetic surveying, control surveying, real-time dynamic positioning, oceanographic surveying, channel surveying, dredging surveying, aviation flight positioning, remote sensing applications, offshore drilling positioning and other measurement systems. [0003] The existing dual-frequency microstrip antenna usually adopts a two-layer patch structure, and realizes circular polarization through offset feed or side feed. Since the antenna adopts bias feed or side feed, it is easy to make the electrical phase center of the antenna and the geomet...

AI Technical Summary

Problems solved by technology

Since the antenna adopts offset feed or side feed, it is easy to make the electrical phase center of the antenna not coincide with the geometric center when receiving signals. When the satellite moves or the dual-frequency microstrip antenna moves, the phase center of the received signal is unstable, making the The received signal has an error, which affects the receiving accuracy of the antenna

For the dual-band two-layer patch, not only is it easy to make the phase center of a single frequency band unstable, but it is also easy to make the phase centers of different frequency bands misaligned, so the dual-band two-layer patch antenna receives more The error of the signal is greater, and the accuracy of signal acceptance is lower

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