Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jass...27..239c&link_type=abstract
Journal of Astronomy and Space Sciences. Vol. 27, no. 3, 239-244
Astronomy and Astrophysics
Astronomy
Dual-Circular Polarizer, Differential Phase Shifter, Corrugated Waveguide, Millimeter Waveguide Circuits, Radio Astronomy Receiver System
Scientific paper
A simulation for the design of a 90o 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 90o 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 90o differential phase shifter's characteristics. The simulation for the differential phase shifter shows that the phase shift is 90o ± 3.3o 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.
Chung Moon-Hee
Han Seog Tae
Je Do Heung
Kim Sooyeon
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