Módulo de correlación y detección de banda ancha y banda Q en guía de onda

Abstract

This contribution presents the design and characterization of a WR22 waveguide correlation and detection module for polarimetry applications in radioastronomy covering the frequency band 35-47 GHz (30%). The module includes the design of a 3-dB 90º hybrid coupler, a 90º phase shifter, a waveguide termination and a Schottky diode detector. The 3-dB 90º hybrid coupler, tested separately, shows an input matching better than 20 dB and accurate phase and amplitude balances. The module itself provides the I, Q and U Stokes parameters simultaneously with good isolation and leakage values. Differences between expected and actual values are found to be due to mechanical tolerances.