Abstract :
In this paper a novel antenna is shown, which uses a combination of helical and monopole elements in order to produce, with the help of a matching circuit, two very wide in bandwidth frequency responses, achieving the coverage of four mobile phone frequency bands, GSM850 (824-894 MHz), E-GSM (880-960 MHz), DCS (1710-1880 MHz), PCS (1850-1990 MHz). Due to its novel design, this antenna has a small size resulting to a compact volume, making it possible to be used inside a mobile phone thus making it invisible to the user. Various simulations and measurements are shown, when the antenna is placed on the bottom side of a ´clamshell´ type mobile phone, achieving a voltage standing wave ratio (VSWR) of less than 3 and a radiation efficiency of more than 50%, across all frequency bands
Keywords :
antenna radiation patterns; frequency response; mobile antennas; mobile handsets; monopole antennas; multifrequency antennas; bandwidth frequency response; clamshell type mobile phone; foldable mobile phone; matching circuit; monopole element; quadband antenna; Antenna measurements; Bandwidth; Circuits; Distributed control; Frequency measurement; Helical antennas; Mobile antennas; Mobile handsets; Personal communication networks; Voltage; antennas; mobile phone antennas; multi-band antennas;
