Radiation efficiency enhancement using lumped inductors for dual-mode mobile phone

Abstract

This letter proposes a radiation efficiency enhancement technique using a lumped inductor for a dual-mode mobile phone.Two planar inverted-F antennas (PIFAs) with a collinear arrangement are used for dual-mode operation at the CDMA band of 824894 MHz and GSM band of 880960 MHz. Each antenna is separately connected to a lumped inductor of 4.7 nH. The electric field is more confined on each inverted-F section at its operating band in this configuration and the coupling between PIFAs is less than -10 dB. The simulated and measured results show that radiation efficiency of the proposed antenna is improved by up to 33%. The radiation patterns are similar to those of a dipole antenna with slightly tilted main beam directions due to the PIFA placement. (c) 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:10111013, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26735