Duplexer with extended functionality

Details Duplexer with extended functionality Duplexer with extended functionality

2006-09-05

2006-09-05

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000, C333S189000

Reexamination Certificate

active

07102460

ABSTRACT:
A duplexer has an asymmetrical antenna port and a symmetrical reception output, and therefore can be interconnected (without any intermediate stages) to an amplifier with a differential input. A reception bandpass filter is arranged in the reception path of the duplexer. The reception bandpass filter can have the functionality of a balun. The transmission input of the duplexer can be designed symmetrically, in which case a transmission bandpass filter arranged in the transmission path should be designed symmetrically on the input side. The impedance of the antenna port of the duplexer can differ from the impedance of the reception output or the transmission input. No intermediate stages (such as a balun or—in cases of impedances that differ between the duplexer and its corresponding amplifier—an impedance transformer) are required between the duplexer and the amplifier that is interconnected (whether before or after) in the transmission or reception path.

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“SAW Antenna Duplexer Module Using SAW-Resonator-Coupled Filter for PCN System,” Shibagaki et al., 1998 IEEE Ultrasonics Symposium, pp. 13-16.

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