Patent ID: 11942920
Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A full-duplex radio comprising:
an antenna to transmit a first radio frequency (RF) signal in a first frequency range and receive a second RF signal at the first frequency range;
transmit (TX) chain circuitry coupled to the antenna;
receive (RX) chain circuitry coupled to the antenna, wherein the RX chain circuitry receives the second RF signal and a reflected portion of the first RF signal;
a directional coupler in the TX chain circuitry, the directional coupler to direct a portion of the first RF signal to the RX chain circuitry; and
a plurality of acoustic delay lines (ADLs) coupled between the TX chain circuitry and the RX chain circuitry to provide a signal delay, wherein the portion of the first RF signal experiences the signal delay and destructively interferes with the reflected portion of the first RF signal, and wherein each ADL of the plurality of ADLs comprises:
a piezoelectric thin film located above a carrier substrate, wherein the piezoelectric thin film is one of an X-cut or Y-cut lithium niobate (LiNbO3) thin film adapted to propagate an acoustic wave;
a first interdigitated transducer (IDT) disposed on a first end of the piezoelectric thin film, the first IDT to convert a first electromagnetic signal, traveling in a longitudinal direction along a length of the piezoelectric thin film, into the acoustic wave; and
a second IDT disposed on a second end of the piezoelectric thin film with a gap between the second IDT and the first IDT, the second IDT to convert the acoustic wave into a second electromagnetic signal, and the gap to determine a time delay of the acoustic wave before output of the second electromagnetic signal.