Title :
Adaptive matching circuitry for compensation of finger effect on handset antennas
Author :
Ramachandran, Prasadh ; Milosavljevic, Zlatoljub D. ; Beckman, Claes
Author_Institution :
Pulse Finland Oy, Kempele
Abstract :
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 2-6 dB loss in efficiency in low-band and 2-4 dB loss in highband. 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 - 4 dB compared to the mismatched case.
Keywords :
impedance matching; mobile antennas; mobile handsets; multifrequency antennas; planar inverted-F antennas; adaptive matching circuitry; dual-band PIFA; dynamic antenna matching technique; finger effect compensation; handset antennas; loss 2 dB to 6 dB; planar inverted-F antennas; terminal antenna; Adaptive arrays; Fingers; Impedance; Loaded antennas; Mobile antennas; Performance loss; Pulse circuits; Pulse measurements; Radio frequency; Telephone sets; Dynamic Antenna Match; Mismatch; Terminal Antenna; Total Efficiency;
Conference_Titel :
Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on
Conference_Location :
Berlin
Print_ISBN :
978-1-4244-4753-4
Electronic_ISBN :
978-3-00-024573-2
