Full-Duplex Communication Technologies

Wideband Dual-Circularly-Polarized FD Antenna:  A dual-circularly-polarized full-duplex antenna with two feeding ports for Tx and Rx was designed using a metasurface array. Both Tx and Rx radiation are circularly polarized, but with opposing chiral, i.e. one for LHCP (Left-Hand Circularly-Polarized) and the other for RHCP (Right-Hand Circularly-Polarized). It could achieve -40dB Tx-to-Rx isolation over a 20% relative bandwidth frequency range. More details..

High Tx-to-Rx Isolation FD Antenna: A 2-by-2 patch array is employed to form an FD antenna with both linearly-polarized Rx radiation and circularly-polarized Tx radiation. As a result of the polarization configuration, a Tx-to-Rx isolation of -60 dB was achieved across a 300 MHz band at around 9 GHz. The proposed antenna is versatile enough to be utilized by both radar and communication systems. More details..

Ultrawideband FD Phased Array: A novel phased array architecture as a method of achieving broadband self-interference cancellation (SIC) in full-duplex wireless backhaul applications was presented. With an antenna-circuit interface synthesis method, a reference network is employed to cancel the residual self-interference signal and maintain desired external signal on the receiver simultaneously. A Tx-to-Rx SIC of 40dB was achieved over a 52% relative bandwidth from 0.85 GHz to 1.45 GHz when the transmitter and receiver antenna arrays are placed close to each other with a distance of merely 50 mm (0.14λ at 0.85 GHz). More details..

FD MIMO System: A 2×2 full-duplex antenna for multi-input multi-output (MIMO) communication that applies circularly-polarization for transmitting and linearly-polarization for receiving respectively was designed using a patch array, which is useful for applications of integrated sensing and communication, as well as producing simplified residual coupling signals. It could achieve both MIMO and duplex isolation more than 59 dB, as well as realized gain of 5.92 dBi for Tx and 10.43 dBi for Rx over a 130 MHz band centered at 5.8 GHz. More Details…

Integrated Communication and Positioning System in CPE: The goal is to update Customer Premise Equipment (CPE) from purely communication functions to combined communication and positioning utilizing the same RF front-end at the same frequencies.