Satellite positioning antenna device

Abstract

The invention relates to an antenna technology, and provides a satellite positioning antenna device which can realize low elevation gain, good circular polarization axial ratio and high transmitting and receiving isolation. The satellite positioning antenna device comprises an upper layer of microstrip antenna, an intermediate layer of microstrip antenna, a lower layer of microstrip antenna and a printed circuit board (PCB) with a phase shift feed network on the back side, wherein the upper layer of microstrip antenna comprises an upper layer of microstrip antenna dielectric slab and an upper layer of microstrip antenna radiation patch layer; the intermediate layer of microstrip antenna comprises an intermediate layer of microstrip antenna dielectric slab and an intermediate layer of microstrip antenna radiation patch layer; the lower layer of microstrip antenna comprises a lower layer of microstrip antenna dielectric slab and a lower layer of microstrip antenna radiation patch layer; a feed probe of the lower layer of microstrip antenna, a feed probe of the intermediate layer of microstrip antenna and a coaxial feed cable of the upper layer of microstrip antenna are connected with the feed network; and a first plated-through hole is formed in the central position of the lower layer of microstrip antenna, a second plated-through hole is formed in the central position of the intermediate layer of microstrip antenna, and a third plated-through hole is formed in the lower layer of microstrip antenna at the feed probe of the intermediate layer of microstrip antenna.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a satellite positioning antenna device. Background technique [0002] In recent years, satellite navigation, positioning and communication systems have been more and more widely used in military and civilian fields, and have played an increasingly important role, such as GPS in the United States, GLONASS in Russia, and Beidou system in my country. The Beidou system independently developed by my country was officially opened on June 1, 2003, marking that my country already has a completely independent satellite navigation system. The Beidou vehicle-mounted antenna device is one of the key components of the Beidou terminal positioning and communication system, which has a very important impact on the performance of the system. As the large-scale application of Beidou navigation and positioning enters a substantive stage, a large number of satellite positioning platforms are requi...

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Problems solved by technology

[0006] The transmitting frequency band of the Beidou system is 1615.68MHz, and the adjacent receiving frequency bands are 1268.52MH and 1561.098MHz. When designing the microstrip antenna, a high-frequency board material with a dielectric constant of not 1 (generally greater than 2) is used, which makes the microstrip antenna Radiation patches with antennas have little difference in size, and mutual coupling results in poor isolation between antennas. In actual use, the isolation between transceiver ports is often required to reach a certain standard. Therefore, how to improve the transceiver isolation of antennas is also a A major difficulty in design

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