Abstract
In this article we carry out the comparative analysis of new compact satellite polarisers based on a square guide with diaphragms. The main electromagnetic parameters of the developed microwave guide devices with various amount of diaphragms were obtained within the satellite frequency interval from 10.7 GHz to 12.75 GHz. Waveguide polarization converters with different amount of diaphragms from 2 to 5 have been designed and optimized. The main parameters of the presented polarizer were calculated applying the numerical method of finite integration in the frequency domain. Optimization of the electromagnetic parameters of the developed waveguide devices was carried out using the software CST Microwave Studio. As a result, sizes of the device designs have been optimized for the provision of improved polarization and phase parameters. The performed analysis showed that a waveguide polarizer with five diaphragms has the best electromagnetic parameters. The developed compact polarizer with five diaphragms based on a square guide provides a minimum deviation of the output phase difference from 90 degrees and high level of isolation between linear polarization over the entire operating frequency range. Presented in the article compact waveguide polarization converters can be applied in satellite systems, which require efficient polarization separation of signals.
Highlights
THE allocation of operating frequency bands to users of different systems and appliances is strictly regulated and monitored
In the frequency interval 10.7–12.75 GHz the designed polarizer with four diaphragms has the following parameters: the output phase difference is in the range 90° ± 3.5°, reflection factor of both perpendicular linear polarizations is less than −19 dB, the transmission factor is greater than −0.05 dB, the isolation of linear polarizations (ILP) is better than 30.3 dB
In the frequency band 10.7–12.75 GHz the developed square guide polarizer with five diaphragms provides the electromagnetic parameters as follows: the output phase difference is 90° ± 2.6°, the reflection factors for both perpendicular linear polarizations are lower than −24 dB, the transmission factors are higher than −0.017 dB, the ILP is higher than −32.9 dB
Summary
THE allocation of operating frequency bands to users of different systems and appliances is strictly regulated and monitored. A new method for the development of dual-band polarizers based on a square waveguide with diaphragms was proposed in [32]. In [37] a new design of a broadband diaphragm polarizer for the operating frequency band 3.4–4.8 GHz is presented. The developed polarizer provides an output phase difference of 90o ± 2.5o with a maximum reflection factor of −33 dB Another efficient design of a waveguide polarizer for the frequency range 85–115 GHz was proposed in [38]. In [74,75,76,77,78,79] the authors developed various theoretical methods for the calculation of characteristics of guide polarizers using the analysis of electromagnetic fields, wave scattering matrices, and approximate approximation techniques for coaxial and ridged structures. The goals of optimization are obtaining of reflection factors for waves with perpendicular linear polarizations less than −24 dB and of IPL higher than 30 dB in the operating frequency band 10.7–12.75 GHz
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