Title :
Dual-frequency planar inverted-F antenna
Author :
Liu, Zi Dong ; Hall, Peter S. ; Wake, David
Author_Institution :
Sch. of Electron. & Electr. Eng., Birmingham Univ., UK
fDate :
10/1/1997 12:00:00 AM
Abstract :
Cellular telephone handsets are now being designed to have dual-mode capabilities. In particular, there is a requirement for internal antennas for GSM and DCS1800 systems. This paper describes a novel planar dual-band inverted-F antenna for cellular handsets, which operates at the 0.9-GHz and 1.8-GHz bands. The dual-band antenna has almost the same size as a conventional inverted-F antenna operating at 0.9 GHz and has an isolation between bands of better than 17 dB. The bandwidths of the antenna are close to those required for the above systems. Good dual-band action is also obtained for other frequency ratios in the range of 1.3-2.4. Studies also show that the dual-band antenna can operate with one or two feeds. A finite-difference time-domain analysis has been shown to give calculated results close to those measured
Keywords :
antenna radiation patterns; cellular radio; finite difference time-domain analysis; mobile antennas; telephone sets; 0.9 GHz; 1.8 GHz; DCS1800 systems; GSM systems; antenna feeds; antenna radiation patterns; band isolation; bandwidth; calculated results; cellular telephone handsets; dual band antenna; dual frequency planar inverted-F antenna; finite difference time domain analysis; frequency ratios; internal antennas; measured results; Antenna feeds; Antenna measurements; Bandwidth; Dual band; Finite difference methods; Frequency; GSM; Telephone sets; Telephony; Time domain analysis;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
