Compact Orthomode Transducers Using Digital Polarization Synthesis

Details Compact Orthomode Transducers Using Digital Polarization Synthesis Compact Orthomode Transducers Using Digital Polarization Synthesis

2010-08-20

arxiv.org/abs/1008.3501v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

12 pages, 20 figures, submitted to MTT Transactions

Scientific paper

In this paper we present a novel class of compact orthomode transducers which use digital calibration to synthesize the desired polarization vectors while maintaining high isolation and minimizing mass and volume. These digital orthomode transducers consist of an arbitrary number of planar probes in a circular waveguide, each of which is connected to an independent receiver chain designed for stability of complex gain. The outputs of each receiver chain are then digitized and combined numerically with calibrated, complex coefficients. Measurements on two prototype digital orthomode transducers, one with three probes and one with four, show better than 50 dB polarization isolation over a 10 C temperature range with a single calibration.

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