Three-Stepped Septum Waveguide Polarizer in the Operating Frequency Band 7.7-8.1 GHz

Authors S.I. Piltyay1 , A.V. Bulashenko1 , T.V. Savenchuk1, O.V. Bulashenko2 , I.V. Zabegalov2

1National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, 37, Peremohy Ave., 03056 Kyiv, Ukraine

2Ivan Kozhedub Shostka Professional College of Sumy State University, 1, Institutskaya St., 41100 Shostka, Ukraine

Issue Volume 15, Year 2023, Number 1
Dates Received 17 December 2022; revised manuscript received 14 February 2023; published online 24 February 2023
Citation S.I. Piltyay, A.V. Bulashenko, et al., J. Nano- Electron. Phys. 15 No 1, 01004 (2023)
PACS Number(s) 84.40.Az, 84.40.Ua
Keywords Polarizer, Waveguide polarizer, Septum polarizer, Circular polarization, Differential phase shift, Axial ratio, Crosspolar discrimination, Satellite antenna systems.

In this article, we have proposed a new design for a waveguide polarizer with a metal plate. The plate has the shape of three steps. The septum polarizer has been designed to operate in the frequency band 7.7-8.1 GHz. Each step of the plate of such a device has its own height and thickness. It is necessary that the first step from the square port is the lowest and thinnest and the last one is the highest and thickest for better matching. The waveguide with a square cross section was chosen for simplicity of production. The basic electromagnetic characteristics of the developed waveguide polarization conversion device were optimized using commercial software. The well-known finite-domain electrodynamic method in the frequency domain was applied in the simulation program. The proposed development method also allows one to optimize the geometric dimensions of the entire waveguide polarizer based on a three-stepped metal plate. The obtained dimensions of the polarizer with the plates will provide the optimal phase characteristics, matching characteristics, polarization characteristics and isolation characteristics between the device ports. The method allows one to obtain the following dimensions: the height of the wall of a square waveguide, the height of three different steps of the plate, the distance between the steps of the plate. Accordingly, the waveguide septum polarizer is capable of cutting the following values of the electromagnetic characteristics in the operating frequency band 7.7-8.1 GHz. Differential phase shift can vary by 90º±0.86º. The maximum voltage standing wave ratio does is 1.044 for vertical and horizontal polarizations. The maximum value of the axial radio of the developed device is 0.13 dB. The maximum crosspolar discrimination of the polarization device is – 42 dB. The isolation between the first and second ports of a three-step polarizer with plates does not exceed – 39 dB. In this way the presented polarizer can be used in modern satellites and radar systems.

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