Six-Port interferometer for direction-of-arrival detection system

摘要

Phase measurement DOA detection is commonly used nowadays. However, the traditional approach are based on conventional mixer architecture or expensive direct conversion devices which has high complexity and costly while comprising robustness. Therefore a new interferometer DOA detection system based on six-port network has been lately investigated and is showing several advantages in respect to traditional solutions. The phase measurement using a six-port interferometer for Direction-of-Arrival (DOA) Detection for Ultrawideband (UWB) application is presented. The presented six-port interferometer is formed by Wilkinson power divider (WPD) and planar 3dB/90° hybrid couplers. The WPD and hybrid couplers are fabricated and the S-parameter performances are measured using Network Analyzer. The measured results of WPD and hybrid coupler are then modelled as six-port interferometer in the Keysight Advanced Design System (ADS) simulation software. The six-port interferometer is modelled by combining measured scattering parameters of the all ports of six-port network. The constructed scattering matrix is transform into touchstone file format. The DOA system comprises of Low Noise Amplifiers (LNAs), six-port interferometer, power detectors and Operating amplifiers (Op-Amps). Its performance is assessed via schematic simulation ADS. The simulated results show the presented six-port interferometer is able to discriminate the detected wave phase of the signal.