On-vehicle low-profile metal-plate antenna for AMPS/GSM/DCS/PCS/UMTS multiband operations

A novel low-profile metal-plate antenna capable of generating two wide resonant modes for covering the AMPS/GSM (824–894 MHz/890–960 MHz) bands and the DCS/PCS/UMTS (1710–1880 MHz/1850–1990 MHz/1920–2170 MHz) bands for mobile communications in vehicles is presented. The proposed antenna is easily achieved by folding a stamped metal plate into a swanlike shape and then feeding it by using a matching-bridge technique. The proposed antenna has a low profile of 27 mm (about 8% of the free-space wavelength at 900 MHz) above the ground plane and shows conical radiation patterns for frequencies across the operating bands. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 144–146, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20074