Patent ID: 11901876
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. 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.