Title :
Antenna tuning for mobile devices: The state of the art and some glimpses of the future
Author :
Boyle, K.R. ; Spits, E. ; de Jongh, M.A. ; Sato, Seiki ; Bakker, T. ; van Bezooijen, A.
Author_Institution :
EPCOS UK Ltd., Bracknell, UK
Abstract :
This presentation introduces a self-contained adaptive antenna tuner for use in mobile phone applications. It allows efficient operation over a wide frequency range with high Q antennas (i.e., antennas for which the impedance changes significantly with frequency). It also adaptively mitigates of the effects of user interaction by measuring the antenna performance and implementing a closed-loop control algorithm that improves the match between the antenna and the PA/LNA. This is achieved using an onboard microcontroller, such that only DC and synchronization inputs are required from the host device.
Keywords :
closed loop systems; low noise amplifiers; microcontrollers; mobile antennas; mobile handsets; power amplifiers; DC inputs; PA/LNA; Q antennas; antenna performance; antenna tuning; closed-loop control algorithm; mobile devices; mobile phone applications; onboard microcontroller; self-contained adaptive antenna tuner; synchronization inputs; user interaction; wide frequency range; Adaptive arrays; Antenna measurements; Impedance; Mobile antennas; Mobile handsets; Tuners; adaptive; antenna; closed-loop; mobile; phone; reconfigurable; tuner;
Conference_Titel :
Antennas and Propagation Conference (LAPC), 2012 Loughborough
Conference_Location :
Loughborough
Print_ISBN :
978-1-4673-2218-8
Electronic_ISBN :
978-1-4673-2219-5
DOI :
10.1109/LAPC.2012.6402943
