Circularly polarized antenna device with high isolation

Abstract

A circularly polarized antenna device with high isolation comprises a conductive grounding plane, a dielectric substrate arranged on the conductive grounding plane and a plurality of radiation sheets arranged on the surface of the dielectric substrate. The radiation sheets are a layer of metal conductors used for receiving or transmitting signals and comprise a plurality of inverted F-shaped radiation sheet groups which are symmetrically distributed. Each inverted F-shaped radiation sheet group comprises an A-shaped inverted F-shaped radiation sheet and a B-shaped inverted F-shaped radiation sheet. Each of the A-type inverted F-type radiation sheet and the B-type inverted F-type radiation sheet comprises an upper part which is horizontally arranged and a lower part which is vertically arranged. Each A-type inverted F-type radiation sheet serves as a feed point, and each B-type inverted F-type radiation sheet serves as an open circuit. According to the invention, independent output of leftwards rotating circular polarization signals and rightwards rotating circular polarization signals is realized by adopting a plurality of the symmetrical inverted F-shaped radiation sheet groups, the isolation degree is high, the processing is simple, the size is small, the weight is light, the application requirements of receiving or transmitting dual-circular polarization signals are met, and the antenna device is particularly suitable for accurate measurement and guidance of system terminal equipment.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a circularly polarized antenna device with high isolation. Background technique [0002] As a component used to transmit or receive radio waves, circularly polarized antennas play a vital role in wireless communication systems, especially in satellite communications and aircraft measurement and control equipment. [0003] The current satellite navigation and positioning equipment is widely used in fields such as positioning, measurement, timing, high-precision agriculture and intelligent transportation. In order to obtain high-precision positioning requirements above the decimeter level, navigation equipment generally adopts RTK (real-time dynamic differential method) technology. And axle ratio bandwidth), and more compact size, while processing and manufacturing should be simple. Due to the advantages of small shape, low cost, easy conformality, easy processing an...

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Problems solved by technology

[0009] 1. Ordinary microstrip antennas generally implement a single-layer medium to achieve a working frequency band. This kind of working bandwidth is relatively narrow, and the working bandwidth is only about 5%. It cannot be well applied in ultra-wideband (spread spectrum) communication systems.

If the bandwidth is increased, it is often necessary to use a medium with a low dielectric constant as the antenna substrate material, and the antenna size will increase at this time

[0010] 2. Conventional helical antennas have good frequency bandwidth, beam width, symmetric pattern, and wide-angle circular polarization. The disadvantage is that only one polarization mode can be realized.

In the case where dual circular polarization is required, the application cannot be satisfied

[0011] 3. Array antenna (or element deformation), frequency bandwidth, symmetric pattern, wide-angle circular polarization performance is good, the disadvantage is that the beam is not wide enough, the structure is more complicated, and the size is larger

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