A Mismatch Detector for Adaptive Antenna Impedance Matching
- 1 September 2006
- conference paper
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE) in 2006 European Microwave Conference
- p. 1457-1460
- https://doi.org/10.1109/eumc.2006.281332
Abstract
The efficiency of a mobile phone's power amplifier suffers from the antenna impedance mismatch caused by the body-effect of its user. A mismatch detector used for an innovative antenna matching algorithm which is based on adaptive correction of the reactive part of the antenna impedance mismatch has been designed, implemented and measured. The mismatch detector which consists of a wideband 90deg phase shifter, a limiter and a Gilbert-cell multiplier detects the phase of the reflection coefficient. The dynamic range of the mismatch detector is up to 142deg at the standard GSM frequencies (900MHz, 1800MHz and 1900MHz) for input power not less than -20dBm. This mismatch detector fulfills the function of determining the mismatch property according to the presented adaptive antenna impedance matching algorithmKeywords
This publication has 5 references indexed in Scilit:
- Antenna impedance mismatch measurement and correction for adaptive CDMA transceiversPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- The performance of GSM 900 antennas in the presence of people and phantomsPublished by Institution of Engineering and Technology (IET) ,2003
- Bodyloss for handheld phonesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1999
- Effects on portable antennas of the presence of a personIEEE Transactions on Antennas and Propagation, 1993
- A 0.7-3 GHz GaAs QPSK/QAM direct modulatorIEEE Journal of Solid-State Circuits, 1993