Miniature three-frequency dual-circular-polarized antenna

Abstract

The invention belongs to the communication and navigation technology field, and concretely relates to a miniature three-frequency dual-circular-polarized antenna. A fixing through hole and a fastening bolt are disposed coaxially in a plumb central line of an upper-layer microstrip patch antenna, a middle-layer microstrip patch antenna, a lower-layer microstrip antenna and a bottom-layer feed network of the antenna. Axes of three first short circuit metalized through holes and the axis of a first feed hole are on the same cylindrical surface with the axis of the fixing through hole being an axis, and the first short circuit metalized through holes and the first feed hole are uniformly distributed on the cylindrical surface in a circumferential manner. The middle-layer microstrip patch antenna is provided with a second feed point. Axes of three second short circuit metalized through holes and the axis of a second feed hole are on the same cylindrical surface with the axis of the fixing through hole being an axis, and the second short circuit metalized through holes and the second feed hole are uniformly distributed on the cylindrical surface in a circumferential manner. The aperture of each first short circuit metalized through hole is equal to the external diameter of a first medium sleeve. The aperture of each second short circuit metalized through hole is equal to the external diameter of a second medium sleeve. The good impedance bandwidth, the good axial ratio bandwidth and the high gain performance are guaranteed, and also miniature and light demands of the size of the antenna are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of communication and navigation, and in particular relates to a miniaturized triple-frequency dual-circular polarization antenna. Background technique [0002] At present, antennas that can work in multiple frequency bands are widely used in receivers of navigation systems, shared antennas for transmitting and receiving of communication stations, radars and communication equipment that work in frequency hopping, and some frequency-agile and polarization-agile antennas. Circularly polarized antennas are widely used in satellite navigation system receivers and other fields. With the rapid development and wide application of satellite navigation technology, people urgently hope that the corresponding antenna has a series of advantages such as wide beam, high gain, circular polarization, multi-frequency point work, miniaturization, and light weight. Nowadays, multi-frequency circularly polarized antennas are ma...

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Problems solved by technology

However, in actual production, it was found that since each layer of the patch with the feed probe needs to arrange a circle of metallized vias outside the feed hole, this makes it necessary not only for the feed hole at the current layer patch An area is reserved on the periphery for metallized vias to penetrate, and at the same time, the bottom patch must also have enough area to accommodate the densely packed metallized vias that are stacked and penetrated from the upper layer and even the upper layer. Obviously, it is extremely unfavorable to the miniaturization requirements of the current antenna volume

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