Slotted waveguide antenna for reception of circular polarized waves

Abstract

A slotted waveguide antenna for receiving circularly polarized waves capable of improving impedance matching, an axial ratio and an axial ratio bandwidth by additionally forming a dielectric plate between a conductive plate having waveguides and a polarizer of an uppermost layer is disclosed. The slotted waveguide antenna for reception of circularly polarized waves, which includes a lower conductive plate and an intermediate conductive plate which are coupled to each other to have a feeding line and a waveguide to which satellite frequency signals are transmitted and an upper conductive plate which is coupled to an upper portion of the intermediate conductive plate and has a plurality of cavities and slots to communicate with the waveguide so as to transmit and receive satellite frequency signals, includes a polarizer with strip conductors for converting linearly polarized waves into circularly polarized waves and matching stubs which are formed at an upper portion of the upper conductive plate, and a dielectric plate which is disposed between the upper conductive plate and the polarizer (100) to perform impedance matching with space impedance.

Description

technical field [0001] The present invention relates to a slot waveguide antenna for receiving circularly polarized waves, and more particularly, to an antenna capable of improving impedance matching, axial ratio, and Slot waveguide antenna for receiving circularly polarized waves with an axial ratio bandwidth. Background technique [0002] In the slot waveguide antenna in the satellite antenna, the feed line to which the satellite signal is transmitted is formed as a waveguide to reduce the feeding loss generated in the process of transmitting the signal in the conventional microstrip patch array antenna (microstrip patch array antenna). )minimize. [0003] Generally, a slot waveguide antenna is formed by stacking a lower conductor plate, an intermediate conductor plate and an upper conductor plate having feed lines and waveguides. The slot waveguide antenna having such a multilayer structure has low resistance loss and low radiation loss by transmitting satellite signals...

AI Technical Summary

Problems solved by technology

[0007] However, in the above-mentioned patent, since the polarizer is directly stacked on the upper end of the upper conductor plate, impedance mismatch occasionally occurs when shifting the frequency bands of satellite signals and communications, thereby reducing the gain of the antenna, and the axial ratio frequency fluctuates will deteriorate the axial ratio characteristics, or reduce the axial ratio bandwidth

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