Cellular mobile radio operates in full duplex mode, e.g. simultaneously transmits and re ceives radio frequency signals. A duplexer is constructed with a transmitter final stage filter (T1) and a receiver top filter (R1). New SAW filters using an extended SAW-resonator-coupled structure have been developed for Japanese cellular radio. A low loss of 1.6 dB for T1 and a high rejection level of 50 dB for R1 have been achieved.
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Hikita et al. (1992) studied this question.
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