Compact Inband Full-Duplex Relays with beyond 100 dB Self-Interference Suppression: Enabling Techniques and Field Measurements

Research output: Contribution to journalArticleScientificpeer-review


Research units

  • Tampere University of Technology


In this communication, the self-interference (SI) channel and the novel enabling techniques for a compact inband full-duplex relay are described and characterized in different operating environments. The full-duplex operation is based on a novel antenna design that uses wavetraps to provide passive isolation of up to 70 dB between the transmit and receive antenna ports. The passive isolation is complemented with novel active RF and digital cancellation stages that further suppress the residual SI to the receiver noise floor. Measurement results of a complete prototype implementation show that the proposed design can achieve an overall SI cancellation performance of over 100 dB even with an ambitious instantaneous bandwidth of 80 MHz. Similar results are obtained both in an anechoic chamber as well as in realistic multipath indoor environments.


Original languageEnglish
Article number7756408
Pages (from-to)960-965
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Issue number2
Publication statusPublished - 1 Feb 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • Antenna design, digital cancellation, full duplex, isolation, relay, RF measurements, self-interference (SI)

ID: 11548107