Broadband circularly polarized filter antenna used for Beidou terminal

Abstract

The invention relates to a broadband circularly polarized filter antenna used for a Beidou terminal and belongs to the technical field of antennas of wireless communication terminals. A folding technology is utilized by the antenna; and a secondary cascade power divider at a bottom layer and a 90-degree phase shifter are cascaded to provide a top radiation patch with a relatively large circular polarization bandwidth. In order to further improve the circular polarization performance of the antenna, two orthogonal bow-tie gaps are etched on the top radiation patch loaded by a regular hexagon gap; and the top patch is divided into five radiation areas to generate multimode resonance, good impedance matching is achieved and the enough circularly polarization bandwidth is obtained. Furthermore, a feed network and a radiation antenna are arranged at two sides of a grounding plate respectively, so that energy can intensively radiate an upper half space effectively, and the antenna not only can radiate in a right-hand circular polarization manner, but also can achieve relatively good circular polarization trap performance on a specific frequency point.

Description

technical field [0001] The invention belongs to the technical field of antennas for wireless communication terminals, and relates to a broadband circular polarization filter antenna applied to Beidou terminals. Background technique [0002] With the passage of time, my country's Beidou satellite antenna navigation system has evolved from the first generation to the second generation, and on the basis of the first generation of Beidou, its working frequency bands have been added to B2 (1207.14±10.23MHz), B3 (1268.52±10.23MHz ) and B1 (1561.098±2.046MHz) frequency bands. In order to build a global satellite navigation system and achieve compatibility and interoperability with other navigation systems, it is necessary to integrate a miniaturized, multi-functional bandwidth antenna and filter device to obtain a circularly polarized filter antenna with more performance and wider bandwidth. . At present, researchers generally focus on the research and design of linearly polarized...

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Problems solved by technology

In addition, with the advancement of science and technology, the original narrowband antenna will be difficult to meet people's requirements for fast and large-capacity information communication. In order to improve the communication quality and reduce the mutual coupling effect between antennas, it is considered to use a single broadband antenna to replace the original Multiple antennas to reduce the number of antennas used, improve design space, and avoid waste of resources

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