Balance filter and duplexer

Details Balance filter and duplexer Balance filter and duplexer

2011-03-29

2011-03-29

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000, C333S195000

Reexamination Certificate

active

07915972

ABSTRACT:
A balance filter includes a first filter having first multimode surface acoustic wave (SAW) filters connected in parallel, a second filter that is connected to the first filter and includes a second multimode SAW filter, a first terminal connected to the first filter, and second terminals connected to the second filter. An input terminal of the balance filter is one of the first and second terminals, and an output terminal thereof is the other. Electric signals transmitted from the first to second filters or vice versa are in opposite phase. Electric signals are input or output via the second terminals in opposite phase.

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Inoue S. et al: “1.9 GHz range ultra-low-loss and steep cut-off double mode SAW filter for the rx band in the PCS antenna duplexer” IEEE Ultrasonics Symposium, vol. 1, Oct. 5, 2003, pp. 389-392, XP010701221 figures 7,9; sections IV, V.

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