Adaptive Matching Circuitry for Compensation of Finger Effect on Handset Antennas

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 4Language: englishTyp: PDF

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Ramachandran, Prasadh; Milosavljevic, Zlatoljub D. (Pulse Finland Oy, Takatie 6, 90440 Kempele, Finland)
Ramachandran, Prasadh; Beckman, Claes (University of Gavle, Centre for RF Measurement Technology, Gävle, SE-801 67, Sweden)

In this paper we present and evaluate the effect of hand on terminal antenna and discuss a method to compensate for the mismatch. A dual band PIFA was used in this study. The presence of the hand was observed to cause 2- 6dB loss in efficiency in low-band and 2-4dB loss in high-band. In this study we propose a dynamic antenna matching (DAM) technique to improve matching level that can improve the total efficiency of the antenna by 2 – 4dB compared to the mismatched case.