Miniaturized six-port receiver for 60 GHz communication

In this paper, a miniaturized front-end six-port receiver prototyped by 130 nm CMOS technology at 60 GHz frequency band is presented. The proposed six-port circuit consists of three compact 3dB branch-line couplers (BLC) and one compact Wilkinson power divider (WPD). Two miniaturization techniques are used; meandering thin-film microstrip transmission lines (MTFM) and capacitive loading (CL). These two techniques lead to dramatic size reduction which is desirable for MMIC technology. Moreover multi-level metallization processes, offered for CMOS technology, is used. The results are provided based on a full-wave commercial electromagnetic package, ADS Agilent. The simulated results show good impedance characteristics over 57-64 GHz frequency band. The S-parameter results, as well as constellation diagram of QPSK modulation with data rate of 3.52 Gbps for three different cases confirm the capability of miniaturized six-port circuit for high data-rate wireless personal area network (WPAN) applications at 60 GHz frequency band.