To further improve LTE B3 diplexer interband isolation,a high-isolation SAW duplexer module is de-signed using SIP technology in this study.The module is composed of two SAW duplexers and three couplers.It applies the phase cancellation of the TX-RX path and the isolation of the couplers to improve the isolation between the uplink and downlink of a single SAW duplexer.An impedance-element filter architecture is used to achieve an i-solation degree of 51 dB for the proposed module.A broadside stripline multilayer helical coupler-line architecture is adopted to achieve miniaturized integrated 3 dB couplers with a wide operating bandwidth.The results of the devel-oped module show that in the B3 band,for a SAW duplexer measuring 8.0 mm×8.0 mm×2.0 mm,the insertion loss is less than 3.2 dB,the return loss exceeds 13 dB,and the isolation degree exceeds 65 dB;furthermore,it can withstand instantaneous power levels up to 34 dBm.
high isolationSAW duplexercouplermodulefrequency division duplexing(FDD)multilayer helical coupling line
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