INTERNAL DUAL-BAND PATCH ANTENNA FOR MOBILE PHONES

Jani Ollikainen, Outi Kivekas, Anssi Toropainen, and Pertti VainikainenHelsinki University of Technology,Institute of Radio Communications,Radio Laboratory,P.O. Box 3000, FIN-02015 HUT, FinlandEmail: jol@radio.hut.fiINTRODUCTIONDevelopment of small antennas for mobile phones has received a lot of attention during the last few years due to sizereduction of the handsets, requirements to keep the amount of RF power absorbed by the user below standardized levelsregardless of the handset size, and introduction of multimode phones. Single-band and dual-band phones in which theexternal whip or helix antenna has been replaced by an internal shorted patch antenna (or PIFA) are already in themarket. It may be assumed that in the future there will also be a need for internal antennas which operate in severalcommunication systems. In this paper, a multiresonant dual-band internal handset antenna is introduced. The antenna isbased on the dual-resonant antenna structure reported in [1]. To our knowledge, this is the first internal handset antennawhich covers the E-GSM900 (880 MHz - 960 MHz), GSM1800 (1710 MHz - 1880 MHz), DECT (1880 MHz - 1900MHz), PCS1900 (1850 MHz - 1990 MHz), and UMTS (1900 MHz - 2170 MHz) frequencies with a return loss L