Mobile phone performance improvements using an adaptively controlled antenna tuner

Summary form only given, as follows. Phone output power and radiation efficiency are degraded by large mismatches, due to compact narrow-band antennas and influence of the user´s hand position. This paper presents a 5 mm × 5 mm multi-band multi-mode adaptive tuning module that counteracts antenna impedance mismatch. The measured average total radiated power (TRP), of a commercially available phone with adaptive tuner, improves by 2.2 dB for free-space condition and 1.9 dB for user interaction with antenna.