Patent ID: 7403082
Filing Date: 2008-07-22
Classification: H04B

Abstract:
1. A dual mode antenna switch module, ASM, comprising: a UMTS TX port; a UMTS RX port; a UMTS duplexer, comprising a common port, a TX port coupled to said UMTS TX port and an RX port coupled to said UMTS RX port; an antenna port; at least one GSM TX port; at least one GSM RX port; and a multi-port switch having respective ports coupled to said antenna port, said at least one GSM TX port, said at least one GSM RX port, and said common port of said UMTS duplexer, wherein the common port of said duplexer has a reflection co-efficient at said connected multi-port switch port with a magnitude in the range 0.8 to 1.0 and with a phase, φ, where −210°≦φ+n×360≦−150° where n is an integer.