Square Waveguide Polarizer with Diagonally Located Irises for Ka-Band Antenna Systems

S Piltyay

doi:10.7716/aem.v10i3.1780

Abstract

This article presents the results of development and optimization of a new square waveguide polarizer with diagonally located square irises. The application of suggested geometrical modification of irises form and location instead of a standard wall-to-wall irises configuration allows to exclude 45-degree twists between wideband waveguide polarizer and orthomode transducer of a dual-polarized antenna feed system. In addition, a waveguide polarizer and polarization duplexer can be manufactured by milling technology as two single details, which makes the proposed engineering solution reliable, simple for simulation, development and application. Suggested new polarizer design was developed for the satellite operating Ka-band. It contains 12 irises, which are symmetrically located in the diagonal corners of a square waveguide. Obtained optimal polarization converter provides excellent matching and polarization performance. The maximum level of VSWR is less than 1.04 for both orthogonal polarizations. Values of cross-polarization discrimination are higher than 32 dB in the operating Ka-band. Developed square waveguide polarizer with diagonally located irises can be applied in modern wideband satellite antennas.

Highlights

MODERN radio engineering and telecommunication systems often provide simultaneous transmission and reception of information intended for multiple users in a single operating frequency bands
The occurring problem of distribution and allocation of information resources within licensed bands is especially relevant in satellite, mobile and radar systems [1,2,3,4]
The application of radio engineering systems, which provide operating at two orthogonal polarizations of electromagnetic waves within the same frequency band, becomes an effective and popular solution [5,6,7]

Summary

INTRODUCTION

MODERN radio engineering and telecommunication systems often provide simultaneous transmission and reception of information intended for multiple users in a single operating frequency bands. In large reflector antenna systems for satellite communications main polarization characteristics are determined by the microwave feed network [8] It includes a corrugated horn [9,10,11,12,13,14], a waveguide polarization converter [15,16,17,18,19], a 45° waveguide twist [7, 8] and a guidebased orthomode duplexer [20,21,22,23,24]. This article is dedicated to solution of mentioned problem by introduction of a new concept of diagonally located irises, which provide effective performance in a wide operating frequency band combined with simple fabrication and the possibility of connection of a waveguide polarizer to an orthomode duplexer without a 45° waveguide twist

STRUCTURE OF A SQUARE WAVEGUIDE POLARIZER WITH DIAGONALLY LOCATED IRISES

CONCLUSIONS