Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2005-02-15
2005-02-15
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S101000, C333S193000
Reexamination Certificate
active
06856213
ABSTRACT:
A radio frequency (RF) hybrid switch module includes an antenna duplexer integrated with a surface acoustic wave (SAW) filter used in a mobile communication device such as a cellular phone. The switch module handles a transmitted signal and received signal of different frequency bands. A parasitic inductance due to a mounting of the SAW filter is reduced, so that an attenuation characteristic at a low frequency of the SAW filter is improved. The RF hybrid switch module includes: a dividing circuit; a switching circuit; a low pass filter (LPF); an electrode for forming at least a portion of the dividing circuit, switching circuit, and the LPF; a laminated body including a dielectric layer having the electrode formed thereon; a SAW filter which is mounted on the laminated body, corresponds to plural frequency bands, and has a grounding port; a diode mounted on the laminated body for forming a portion the switching circuit, a grounding electrode formed in the laminated body, and a via-conductor directly connecting the grounding port of the SAW filter.
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Nikkei Electronics, No. 776, pp. 47-54, Aug. 14, 2000 (w/partial English translation).
Communication Purusant to Article 115(2) EPC dated May 4, 2004.
Omori Yoshiharu
Satoh Yuki
Tsurunari Tetsuya
Matsushita Electric - Industrial Co., Ltd.
RatnerPrestia
Summons Barbara
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