Triple-frequency operation for a hand-set mobile telephone with reduced EMW hazard

In the paper an attempt to solve the problem of electromagnetic wave (EMW) hazard caused by the radiation from hand-set mobile antenna as well as the problem of the hand-set mobile operation with differently tuned frequencies was suggested. A quarter-wave triple-two-element array antenna was implemented to fulfill these requirements. This antenna configuration was capable of operating with three different tuned frequencies 817.5 MHz, 1751.5 MHz and 1984 MHz. Moreover the radiation pattern of each tuned frequency has a notch in the direction of the handset user's head. Using such array antenna in the hand-set mobile telephone makes it compatible with the worldwide different operating systems namely GSM-900, PCS-1800, DCS-1900 and DECT and also safer to use than the hand-set mobile with single monopole or helical antenna.