Compact polarization converter for satellite antenna systems
Abstract
The article proposes a simple method of optimization and development of polarization devices with diaphragms using the method of equivalent microwave circuits. The principle of the method consists in the separation of the network of the waveguide polarization processing device into simple equivalent circuits. Each circuit is described by its scattering and transmission matrices. Next, the main characteristics of the presented device are expressed through the elements of the general wave scattering matrix. The basic electromagnetic characteristics of the device include the following: phase, matching and polarization. A polarization processing device with three diaphragms based on a square waveguide has been developed. In the frequency range 13.0-14.4 GHz a procedure of optimization of the electromagnetic characteristics has been performed. In the operating frequency band the designed waveguide device provides the phase difference within the range of 90 ° ± 4.0 °. The peak value of its level of voltage standing wave equals to the value of 2.04. The maximum value of the ellipticity factor is 0.6 dB, and the minimum level of cross-polarization isolation is 29.5 dB. To verify the correctness of the obtained results, numerical simulation of the device has been performed using the finite integration method in the frequency domain and the finite element method in the time domain. The simulation results have shown that the presented method has a slight discrepancy with the known electromagnetic methods of analysis of microwave devices. Therefore, the developed new waveguide polarization device with three diaphragms presents consistent and high-quality electromagnetic characteristics in the entire operating frequency range of 13.0–14.4 GHz. The developed polarization converter can be used in antenna systems, in which the polarization signal processing is carried out
Keywords
polarizer; waveguide polarizer; diaphragm; waveguide; phase difference; ellipticity factor; crosspolar isolation
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