Planar monopole folded into a compact structure for very-low-profile multiband mobile-phone antenna

✍ Scribed by Pey-Ling Teng; Kin-Lu Wong

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 232 KB
• Volume: 33
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.10219

✦ Synopsis

Abstract

A planar monopole consisting of three branch strips and folded into a rectangular‐box‐like compact structure for very‐low‐profile GSM/DCS/PCS multiband mobile‐phone antennas is presented. The three branch strips are designed to operate as quarter‐wavelength structures at 900, 1800, and 1900 MHz, respectively, and the obtained impedance bandwidths cover the required bandwidths of the GSM band (890–960 MHz), the DCS band (1710–1880 MHz), and the PCS band (1850–1990 MHz). The proposed antenna has a compact size of 6.5 mm in height, 6 mm in width, and 25 mm in length, and can be mounted on top of a mobile phone with a small distance of 3 mm to the ground plane, resulting in a very low profile of 9.5 mm (less than 3% of the wavelength at 900 MHz) from ground for the proposed antenna in practical applications. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 22–25, 2002; DOI 10.1002/mop.10219