PROJECT TITLE :

Balanced quad-band diplexer with wide common-mode suppression and high differential-mode isolation

ABSTRACT:

A balanced quad-band diplexer is proposed with wide common-mode (CM) suppression and high differential-mode (DM) isolation during this study. The six-port balanced diplexer was fashioned by combining two dual-band bandpass filters operating at 1.92/5.25 and a pair of.45/5.8 GHz through two stepped-impedance resonator (SIR) inserted T-junctions. By rigorously planning the section length of the T-junction and therefore the SIR length from its open-finish to the joint-point with the T-junction, high isolation between diplexer channels will be attained. A prototype of the proposed balanced quad-band diplexer was implemented and measured with a DM isolation of higher than 51.eight dB and a CM suppression of larger than forty seven.9 dB in the four DM passbands. Sensible agreement was observed between the simulated and the measured results.