Acoplador híbrido de banda ancha y banda Q en tecnología de guía de onda integrada en sustrato

Abstract

This paper presents the design and characterization of a 3-dB hybrid coupler designed in substrate integrated waveguide (SIW) technology covering the 35 – 47 GHz bandwidth with excellent performance in terms of phase error and amplitude imbalance, which makes this circuit suitable for broadband applications such as polarimetry in radioastronomy. The measured results, supported by realistic simulations, show an input matching better than 20 dB, transmission and coupling losses around 4 dB, and isolation better than 15 dB. The mean value of the phase difference between coupler outputs is 90.1º and the mean value of the amplitude imbalance between them is 0.1 dB in the band of interest.