DESIGN AND IMPLEMENTATION OF AN ULTRA-WIDEBAND SIX-PORT NETWORK

This paper presents a six-port network over an ultra- wideband (UWB) of 2{8GHz. Its key component is the six-port junction, which consists of a Wilkinson power divider and three 3-dB quadrature couplers. This six-port junction is accomplished in a low dielectric constant substrate (Rogers RT/duroid 5880). Multi-section impedance transformation is applied in the power divider, and the quadrature coupler is realized by using two 8.34dB couplers in tandem. An ultra-wideband operation of the six-port junction is verifled by full electromagnetic simulations and measurements. The results show that the designed devices exhibit good performance across 2{8GHz band: the return losses at input ports are higher than 15dB, the insertion losses from input ports to the remaining ports are 7:2dB § 1:7dB, the isolation between two input ports is greater than 20.5dB, and the maximum phase difierence compared with the theoretical behavior between two test ports is 10 - . For the manufactured six-port junction, a six-port phase measurement system and a calibration technique based on support vector regression (SVR) are introduced. Results show that the SVR model can achieve a mean phase error of 1.5274 - .