Acoustic matrix filters and radios using acoustic matrix filters
AssigneeMurata Manufacturing Co., Ltd.
InventorsAndrew Guyette, Neal Fenzi
Life of this patent
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Abstract
There are disclosed acoustic filters and radios incorporating the acoustic filters. A filter includes a first filter port, a second filter port, and n sub-filters, where n is an integer greater than one. Each sub-filter has a first sub-filter port connected to the first filter port and a second sub-filter port connected to the second filter port. A first acoustic resonator is connected from the first filter port to ground, and a second acoustic resonator is connected from the second filter port to ground. The first and second acoustic resonators are configured to create respective transmission zeros adjacent to a lower edge of a passband of the filter.
Claims18
A filter, comprising:
- a first filter port and a second filter port;
- n sub-filters, where n is an integer greater than one, each of the n sub-filters having a first sub-filter port connected to the first filter port and a second sub-filter port connected to the second filter port;
- and
- at least one transversely-excited film bulk acoustic resonator (XBAR) connected between ground and at least one of the first and second filter ports and configured to create transmission zeros adjacent to a lower edge of a passband of the filter.
A time division duplex (TDD) radio, comprising:
- a transmitter;
- a receiver;
- a filter, comprising:
- a first filter port configured to connect to an antenna and a second filter port;
- n sub-filters, where n is an integer greater than one, each sub-filter having a first sub-filter port connected to the first filter port and a second sub-filter port connected to the second filter port;
- at least one transversely-excited film bulk acoustic resonator (XBAR) connected between ground and at least one of the first and second filter ports and configured to create transmission zeros adjacent to a lower edge of a passband of the filter;
- and
- a transmit/receiver switch configured to selectively connect the second filter port to one of an output of the transmitter and an input of the receiver.
Dependencies are inferred from the claim text.