A dual-band 6-port quasi-Composite Right-Left Handed Branch-line coupler

In this paper the quasi-CRLH dual-band coupler was embedded into six-port front-end architecture (Nguyen, 2006) and realized in microstrip technology. The advantages of this solution are: multiport DB (can be used in both transmitter and receiver and dual-band operation - GSM 900MHz, 1.8GHz), relatively compact circuit size and easy fabrication.