This paper presents studies on the self-interference level of a 28-GHz full-duplex phased-array system. The full-duplex system consists of two 64-element phased-arrays and a 28-GHz canceller. The phased-arrays are designed with 2×2 beamformer chips, and the arrays are used as a transmitter and a receiver with a cross-polarization set-up. The 28-GHz canceller is also based on the same 2×2 beamformer chip with multiple-delay taps. The full duplex front-end with a canceller results in 57-dB isolation between the transmitting and receiving arrays at 28.5-29.5 GHz without saturating any LNAs. The system requires only 16-dB additional digital cancellation to bring the self-interference down to the receiver noise floor of 1-GHz bandwidth while the transmit EIRP is maintained at 41 dBm.
|Title of host publication||IMS 2020 - 2020 IEEE/MTT-S International Microwave Symposium|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||4|
|Publication status||Published - 2020 Aug|
|Event||2020 IEEE/MTT-S International Microwave Symposium, IMS 2020 - Virtual, Los Angeles, United States|
Duration: 2020 Aug 4 → 2020 Aug 6
|Name||IEEE MTT-S International Microwave Symposium Digest|
|Conference||2020 IEEE/MTT-S International Microwave Symposium, IMS 2020|
|City||Virtual, Los Angeles|
|Period||20/8/4 → 20/8/6|
Bibliographical noteFunding Information:
ACKNOWLEDGMENT This work was supported by Space Core Technology Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2017M1A3A3A02016255). J. Myeong and K. Park contributed equally to this paper.
© 2020 IEEE.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Electrical and Electronic Engineering