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US 2012/0235877 A1Published application
Band reject filters
OwnerSteve Beaudin, Chun-Yun Jian +1inventors
InventorsSTEVE BEAUDIN, CHUN-YUN JIAN, SOMSACK SYCHALEUN
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OwnerSteve Beaudin, Chun-Yun Jian +1inventors
InventorsSTEVE BEAUDIN, CHUN-YUN JIAN, SOMSACK SYCHALEUN
Estimating the term…
Distributed band reject filters are disclosed. A band reject filter includes a first acoustic resonator and a second acoustic resonator, each of which has either shunt resonators adapted to resonate substantially at respective resonance frequencies defining a rejection frequency band or series resonators adapted to anti-resonate substantially at respective anti-resonance frequencies defining the rejection frequency band. These resonators are connected through a phase shifter which imparts an impedance phase shift of approximately 45° to 135°. Exemplary applications of the band reject filters disclosed herein include implementation as an inter-stage band reject filter for a base station power amplifier for a wireless communication system, as a radio frequency band reject filter in a duplexer for a wireless communication terminal, and in a low noise amplifier input stage.
A network element for a wireless communication system, the network element comprising:
A method of operating a network element for a wireless communication system, the network element comprising an antenna system, a transmitter coupled to the antenna system to transmit radio frequency signals in a transmit frequency band via at least one antenna of the antenna system, and a receiver coupled to the antenna system to receive radio frequency signals in a receive frequency band different from the transmit frequency band via at least one antenna of the antenna system, the method comprising, at at least one of the transmitter and the receiver:
Dependencies are inferred from the claim text.