Left-handed and right-handed double circular polarized wide beam antenna

Abstract

The invention proposes a left-handed and right-handed double circular polarized wide beam antenna and aims to provide the left-handed and right-handed double circular polarized wide beam antenna which is simple and reliable and can be realized on the premise that an excessively complicated structural form does not need to be adopted. The left-handed and right-handed double circular polarized wide beam antenna is realized by the following technical scheme: four monopole antennae surround the center of a circle and are uniformly arranged on a co-metal grounding plate in the manner of an equal circumference angle of 90 degrees; and antenna input ports of four monopoles are subjected to feed of 0 degree, 90 degrees, 180 degrees and 270 degrees as well as 0 degree, -90 degrees, -180 degrees and -270 degrees according to feed of four quadrant distribution of 0 degree, 90 degrees, 180 degrees and 270 degrees as well as 0 degree, -90 degrees, -180 degrees and -270 degrees by taking antenna input ports at the bottom of the grounding plate as corresponding feed ports to form the left-handed and right-handed double circular polarized monopole wide beam antenna. According to the left-handed and right-handed double circular polarized wide beam antenna, a synthetic directional diagram is prevented from forming a recess in a top point by adjusting the distance between the monopole and the center of the circle according to wide beam characteristics of the monopole antennae and a relatively good mutual coupling effect of the monopole antennae together forming an array.

Description

technical field [0001] The invention relates to a wide-beam left-hand-rotating double-circular polarization antenna widely used in satellite communication systems on a terminal receiving equipment platform. technical background [0002] As a component used to transmit or receive radio waves, antennas play a vital role in wireless communication systems. With the rapid development of wireless communication systems, the requirements for antennas are getting higher and higher. On the one hand, the antenna is required to have the characteristics of broadband, multi-function, and multi-service integration, and on the other hand, the antenna is required to be small in size, light in weight, and low in cost. Circularly polarized antennas have a greater advantage because there is no polarization mismatch and it is easier to obtain balanced received power with low correlation. A pair of left-handed circularly polarized waves and right-handed circularly polarized waves are cross-pola...

AI Technical Summary

Problems solved by technology

For this reason, many literatures have proposed dual-frequency dual-polarized antennas, but most of them study dual-linear polarization, linear polarization and circular polarization, or dual-polarization methods of the same hand direction. It is still a direction worthy of research to realize different left and right circular polarization duplex communication on the transceiver frequency with horizontal frequency interval. In addition, due to the influence of high-order mode, spurious radiation and dispersion characteristics, the isolation of microstrip antenna is generally only 10 -20dB

Poor port isolation will seriously affect the communication quality, especially in the transceiver duplex antenna, the strength of the received signal is usually much weaker than that of the transmitted signal, and it is more likely to be interfered. Therefore, how to obtain high isolation is a satellite A very pressing problem in communication

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