Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2005-04-26
2005-04-26
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S189000, C333S191000
Reexamination Certificate
active
06885260
ABSTRACT:
A transmission band filter (110) having a series of elements (111, 113, 115) each composed of a film bulk acoustic resonator and grounded shunt elements (112, 114) each composed of a film bulk acoustic resonator is connected between a transmission port (102) and an antenna port (106). A reception band filter (130) having a series of elements (131, 133, 135) each composed of a film bulk acoustic resonator and grounded shunt elements (132, 134, 136) each composed of a film bulk acoustic resonator is connected between a reception port (104) and the antenna port (106). A film bulk acoustic resonator (150) for adjustment is connected between the antenna port (106) and the ground. The resonance frequency of the adjusting film bulk acoustic resonator (150) lies between the upper limit frequency of the transmission frequency pass band of the transmission band filter (110) and the lower limit frequency of the reception frequency pass band of the reception band filter (130). Therefore a duplexer such that it can be a monolithic element, the power handling capability is good, the size is small, and the cost is low is provided.
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C.W. Seabury et al.; “Thin Film ZnO Based Bulk Acoustic Mode Filters”; 1997 IEEE MTT-S Microwave Symposium Digest; Jun. 1997, vol. 1, pp. 181-184.
Hashimoto Chisen
Kimura Hirofumi
Masui Eiji
Nagao Keigo
Nishimura Kosuke
Santucci Ronald R.
Summons Barbara
UBE Industries Ltd.
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