Patch antenna with wire radiation elements for high-precision GNSS applications

a technology of radiation elements and antennas, applied in the field of antennas, can solve the problems of overall design complexity, inability to meet the standard operation of high-precision gnss receivers, and inability to meet the standard operation of forward hemispheres, and achieve the effect of reducing directional patterns

US20190140354A1Active Publication Date: 2019-05-09TOPCON POSITIONING SYST INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Publication Date
2019-05-09
Patent Text Reader

Abstract

A right-hand circularly-polarized patch antenna comprising a ground plane and a patch connected to each other with one or more wires for which the wire shape and location of the end points are selected such that they do not cause an antenna mismatch, and the electrical current carried in the wires produces an extra electromagnetic field subtracted from the patch field in the nadir direction.
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Description

TECHNICAL FIELD

[0001] The present invention relates generally to antennas, and more particularly to patch antennas used in Global Navigation Satellite Systems (GNSS).BACKGROUND OF THE INVENTION

[0002] A wide range of consumer, commercial, and industrial applications utilize patch antennas in GNSS applications which can determine locations with high accuracy. Currently deployed systems include the United States Global Positioning System (GPS) and the Russian GLONASS, and others such as the European GALILEO system are under development.

[0003] In a GNSS, a navigation receiver receives and processes radio signals transmitted by satellites located within a line-of-sight of the navigation receiver. A critical component of a GNSS is the receiver antenna. Key properties of the receiver antenna include bandwidth, multipath rejection, size, and weight. High-accuracy navigation receivers typically process signals from two frequency bands. For example, two common frequency bands are a low-frequency...

Examples

Embodiment Construction

[0009]In accordance with an embodiment, a single-band right-hand circularly-polarized patch antenna comprises a ground plane and a patch connected to each other with at least four (4) wires for which the wire shape and location of the end points are selected such that they do not cause an antenna mismatch, and the electrical current carried in the wires produces an extra electromagnetic field subtracted from the patch electromagnetic field in the nadir direction. In accordance with the embodiment, this facilitates an antenna with low DP level (i.e., Down / Up level) in the nadir direction and with a smaller (and shorter) ground plane such that the size of the ground plane becomes practically as long as the patch, and there is no additional power supply necessary to power the wires. In accordance with an embodiment the patch antenna is a single-band right-hand circularly-polarized patch antenna providing a reduced directional pattern in the backward hemisphere.

[0010]In accordance with ...