Bandwidth-optimal single-tunable-element matching network for antenna tuning in mobile handsets

Summary form only given, as follows. This paper presents a single-tunable-element matching network optimized for the GSM850 and GSM900 bands. A simple model for antenna detuning based on extensive measurements from literature is first presented. Single tunable element implementations for a planar inverted-F antenna as well as a proof-of-concept for the iPhone 4TM antenna are shown. Measured results indicate transducer gain improvements of up to 3.5 dB (53%) and 5.6 dB (57%) can be obtained for the two implementations, respectively.