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http://dx.doi.org/10.6109/JKIICE.2009.13.1.17

A Method of Improving Isolation Between Tx and Rx Paths in TDD Systems  

Kang, Sang-Gee (군산대학교)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.13, no.1, 2009 , pp. 17-22 More about this Journal
Abstract
A switch or circulator is used for distinguishing between the paths of transmitter and receiver in TDD systems. If the isolation between Tx and Rx paths is low in TDD systems, the output signal of the ransmitter acts as an interferer to the receiver even if the transceiver operates on the receiver mode. In this paper we propose a method to get high isolation characteristics between transmitting and receiving paths in TDD systems. We implement the module with a proposed improving method to verify the effect of the isolation improvement and the experimental results are presented. The isolation improvement of above 44.8 dB over the frequency bandwidth of 30 MHz is obtained from the implemented isolation improvement module.
Keywords
Isolation; Time Division Duplexing; Circulator; High Power Amplifiers;
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  • Reference
1 WiMax Forum, www.wimaxforum.org
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3 Sanggee Kang, Myungsun Song, Huimin Yi and Seongyong Hong, "Adaptive control method for a feedforward amplifier," VTC2004 spring, May 2004