Performance Variation in Electrical Balance Duplexers due to User Interaction

Leo Laughlin, Mark A Beach, Kevin A Morris, John L Haine

Research output: Contribution to conferenceConference Paperpeer-review

5 Citations (Scopus)
60 Downloads (Pure)

Abstract

A key issue impacting the transmit to receive (TX-RX) isolation in Electrical Balance (EB) Duplexers is dynamic matching of the antenna impedance by the balancing network. Circuit simulations including embedded antenna measurements have been used to investigate the variation in TX-RX isolation due to interaction with the user and the local environment. Simulated results at 847MHz and 1960MHz show user interaction causes over 25dB of variation in the mean isolation over a 20MHz bandwidth. However, in reflective indoor environments, user interaction on average improves TX-RX isolation. This observed performance improvement is a result of reduced antenna radiation efficiency, which makes reflections from objects at longer ranges less significant and thereby reduces frequency domain variation in the antenna reflection coefficient.
Original languageEnglish
Publication statusPublished - Sep 2014
Event25th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2014) - Washington, DC, United States
Duration: 2 Sep 20145 Sep 2014

Conference

Conference25th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2014)
CountryUnited States
CityWashington, DC
Period2/09/145/09/14

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