Band reject filters

Details Band reject filters Band reject filters

2011-08-23

2011-08-23

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S125000, C333S136000, C333S189000, C333S193000, C330S12400D, C330S286000, C330S295000, C330S302000, C330S053000

Reexamination Certificate

active

08004371

ABSTRACT:
Distributed band reject filters are disclosed. A first radio frequency band reject filter is disclosed having a splitter having a first input port, a first output port and a second output port, the splitter being operable on an input signal applied to the first input port to provide a respective output signal proportional to the input signal at each of the first and second output ports, the output signals having a phase shift between 45 degrees and 135 degree with respect to the input signal, as well as first, second and third acoustic resonators coupled respectively to the first input port, the first output port and the second output port. A second radio frequency band reject filter is disclosed having a combiner having a first input port, a second input port and a first output port, the combiner being operable on an input signals applied to the first input port and the second input port to provide a respective output signal proportional to the input signals at the first output port, the output signal having a phase shift between 45 degrees and 135 degree with respect to the input signals, as well as first, second and third acoustic resonators coupled respectively to the first input port, the second input port and the first output port. Also disclosed are amplifiers that comprise such radio frequency band reject filters.

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