Internal triple-band folded planar antenna design for third generation mobile handsets

• Published in: IET microwaves, antennas & propagation Vol. 2; no. 7; pp. 718 - 724
• Main Authors: SEE, C. H, ABD-ALHAMEED, R. A, EXCELL, P. S, MCEWAN, N. J, GARCLINER, J. G
• Format: Journal Article
• Language: English
• Published: Stevenage Institution of Engineering and Technology 01.10.2008; The Institution of Engineering & Technology
• Subjects: Antenna design; Antennas; Applied sciences; Bandwidth; Cell phones; Equipments and installations; Exact sciences and technology; Ground plane; Impedance; Microwave antennas; Mobile radiocommunication systems; Radiocommunications; Telecommunications; Telecommunications and information theory; Tuning; Mobile radiocommunication; Mobile phone; Impedance matching; Return loss; Wireless telecommunication; Printed antenna; UMTS system; Far field; Radiation pattern; Plane antenna; Impedance; Planar technology
• ISSN: 1751-8725; 1751-8733
• DOI: 10.1049/iet-map:20070356

A novel internal triple-band folded planar antenna for mobile handsets is introduced, formed by modifying the geometry of a rectangular patch antenna to include a shorting pin, folded sides, a shorted microstrip stub and a notch. The size of the antenna is successfully reduced to a volume of 34 x 34 x 7 mm^sup 3^. The antenna is mounted on a finite ground plane of 50 x 100 mm^sup 2^. The impedance bandwidth achieved was 29.7% (equivalent to return loss ≤ -10 dB); this covers the DCS1800, PCS1900 and UMTS 2000 bands. The characteristics of the proposed antenna, including impedance bandwidth and far field radiation patterns are discussed theoretically and experimentally; the simulated and measured results show good agreement. The tuning effects of the geometry parameters on impedance matching of the proposed antenna are also investigated.