Title :
Finite-difference time-domain analysis of a stacked dual-frequency microstrip planar inverted-F antenna for mobile telephone handsets
Author :
Tong, Ming-Sze ; Yang, Mingwu ; Chen, Yinchao ; Mittra, Raj
Author_Institution :
Dept. of Electron. & Inf. Eng., Hong Kong Polytech., Kowloon, China
fDate :
3/1/2001 12:00:00 AM
Abstract :
We describe a stacked, dual-frequency microstrip planar inverted-F antenna (DF-PIFA) for mobile telephone handsets that can concurrently work in two frequency-bands, viz., those associated with the GSM and DCS 1800 systems operating at 0.9 GHz and 1.8 GHz, respectively. The proposed microstrip DF-PIFA is fed by a coaxial line, as opposed to two separated feed lines used in the conventional design. The design is carried out in a systematic manner and involves two steps. We begin with an initial configuration of the PIFA that is based on a standard design for a microstrip patch antenna fed by a coaxial line and is derived from an empirical approximation in conjunction with a transmission line model. Next, we employ a computer-aided design (CAD) tool, based on the nonuniform finite-difference time-domain (NU-FDTD) Maxwell solver, to optimize the performance characteristics of the DF-PIFA, including the return loss, the matching of the input impedance, and the far-field radiation patterns
Keywords :
CAD; Maxwell equations; UHF antennas; antenna feeds; antenna radiation patterns; cellular radio; coaxial cables; electrical engineering computing; finite difference time-domain analysis; impedance matching; microstrip antennas; mobile antennas; multifrequency antennas; telephone sets; transmission line theory; 0.9 to 1.8 GHz; CAD tool; DCS 1800 systems; FDTD analysis; GSM; UHF; coaxial line fed antenna; computer-aided design; empirical approximation; far-field radiation patterns; feed lines; finite-difference time-domain analysis; frequency-bands; input impedance matching; microstrip DF-PIFA; microstrip patch antenna; microstrip planar inverted-F antenna; mobile telephone handsets; nonuniform FDTD Maxwell solver; performance characteristics; return loss; stacked dual-frequency microstrip antenna; transmission line model; Coaxial components; Design automation; Finite difference methods; Frequency; GSM; Microstrip antennas; Mobile antennas; Telephone sets; Telephony; Time domain analysis;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
