Design of Wideband Complex Ratio Measuring Unit (CRMU) in multilayer microstrip-slot technology for the application of QPSK modulator

• Main Authors: Abdul Rahim, Sharul Kamal, Mohamed Ghazali, S. N. A., Seman, Norhudah, Rahim, M. K. A.
• Format: Conference or Workshop Item
• Published: 2012
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utm.my/id/eprint/34048/; http://apace2016.myapmttemc.org/

This article presents the design of a planar complex ratio measuring unit (CRMU) for the designated frequency range of 2 to 6 GHz in multilayer microstrip-slot technology. This CRMU utilizes one in-phase power divider and three 3 dB quadrature couplers. The analysis is performed to assess the performance of CRMU for the purpose of Quadrature Phase Shift Keying (QPSK) modulation. The parameter of transmission coefficients, return losses, q-point circle centers and QPSK constellations are presented. CST Microwave Studio is used for the CRMU design and the analysis on S-parameter performances is performed using Agilent's Advanced Design System (ADS) software.