A self-contained adaptive antenna tuner for mobile phones: Featuring a self-learning calibration procedure

Guest Editorial: IEEE AWPL Special Cluster on Terminal Antenna Systems for 4G and Beyond

“…Modern antenna solutions need to be embedded, favoring planar structures [10], [11] that are either printed directly on the printed circuit board (PCB) of the handset or have a reduced height over it. In some cases, the use of lumped circuit elements will be necessary to overcome the problems caused by the small size of the antenna elements, to increase the number of frequency bands [12], and even to compensate for the effect of the human user [13]. This idea is further developed here by Caporal del Barrio et al, who propose a combination of highly isolated, narrowband tunable antennas and a tunable front end to overcome the challenge of bandwidth in LTE terminals.…”

Design of a compact, fully‐autonomous 433 MHz tunable antenna for wearable wireless sensor applications

“…At the present time, WSN research platforms [8][9][10][11] use fixed antenna impedance matching networks that cannot adapt to changing antenna environments such as in wearable BSN applications. Adaptive antenna tuning networks are extremely desirable and have been investigated by many researchers in recent times for cellular applications [12,13]. These antenna tuning solutions offer potential benefits for cellular applications where human hand and head effects are of key concern.…”