Híbrido 180º de banda ancha en tecnología Microstrip a 41 GHz

Abstract

A broadband modified rat-race hybrid with around 30% bandwidth is presented in this paper. The hybrid was developed from 35 to 47 GHz bandwidth (centre frequency 41 GHz) using microstrip technology on Alumina substrate. The design uses CPWG-Microstrip transitions to measure the response of the circuit in a coplanar probes station. The measurements over the frequency bandwidth show a maximum amplitude imbalance of 0.5 dB, the phase variation is ± 5º, the isolation is better than 20 dB and the return loss is greater than 10 dB. Moreover, the circuit is planar and consists of a single layer, without requirements of metallic holes and bonding wires, so it is also a low-cost circuit.