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Simulation of A 90° Differential Phase Shifter for Korean VLBI Network 129 GHz Band Polarizer

  • Chung, Moon-Hee (Korea Astronomy and Space Science Institute) ;
  • Je, Do-Heung (Korea Astronomy and Space Science Institute) ;
  • Han, Seog-Tae (Korea Astronomy and Space Science Institute) ;
  • Kim, Soo-Yeon (Korea Astronomy and Space Science Institute)
  • Received : 2010.06.15
  • Accepted : 2010.08.27
  • Published : 2010.09.15

Abstract

A simulation for the design of a $90^{\circ}$ differential phase shifter aimed toward Korean VLBI Network (KVN) 129 GHz band polarizer is described in this paper. A dual-circular polarizer for KVN 129 GHz band consists of a $90^{\circ}$ differential phase shifter and an orthomode transducer. The differential phase shifter is made up of a square waveguide with two opposite walls loaded with corrugations. Three-dimensional electromagnetic simulation has been performed to predict the $90^{\circ}$ differential phase shifter's characteristics. The simulation for the differential phase shifter shows that the phase shift is $90^{\circ}{\pm}3.3^{\circ}$ across 108-160 GHz and the return losses of two orthogonal modes are better than -30 dB within the design frequency band. According to the simulation results the calculated performance is quite encouraging for KVN 129 GHz band application.

Keywords

dual-circular polarizer;differential phase shifter;corrugated waveguide;millimeter waveguide circuits;radio astronomy receiver system

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