Waveguide power supply system of a horn antenna with circular polarization
Abstract
The article presents the methodology for developing and optimizing the power supply system of a horn antenna with circular polarization. A horn antenna has a metal structure and consists of a waveguide having a variable cross-section and an open radiating end. Electromagnetic waves in such antenna are excited by a waveguide that is connected to a narrow wall of the horn antenna. The proposed power system of the horn antenna consists of a rectangular waveguide with a slit. In order to obtain the excitation of signals with circular polarization at the output, the slit has been cut in a rectangular waveguide at an angle of 45º. As a result, the circuit makes it possible to generate the signals with right-hand circular polarization and left-hand circular polarization. The presented design of the horn antenna power supply system eliminates the need to develop a separate waveguide device for forming a circular polarization. The designed power system for horn antenna with circular polarization can be used at an operating frequency of 8.0 GHz. At these frequencies the reflection coefficient is less than -19 dB. The proposed horn antenna provides a maximum value of the gain of 21 dB for righthand circular polarization and a maximum value of the gain of 10 dB for left-hand circular polarization. Cross-polarization isolation is higher than 10 dB. Therefore, the developed power system of the horn antenna provides a narrowband operating mode at the circular polarization with satisfactory electromagnetic polarization characteristics and matching at the frequency of 8 GHz. The developed power supply system of the horn antenna with circular polarization can be used in radio engineering systems, which carry out polarization processing of signals
Keywords
circular polarization; horn antenna; waveguide; slit; gain; radiation pattern
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