Abstract
Seeing an increasing demand for small antennas as there is now a trend for PDA manufacturers to incorporate stand-alone RF modules equipped with mobile phone functions, including web-browsing capabilities, into their products, custom-made small antennas are designed for mobile devices or LAN cards. Employing various techniques for size reduction such as shorting walls, shorting pins, cutting slots (including U- and L-shaped slots), and parasitic elements, a wide range of small antennas including dual-band antenna for 900 MHz GSM and 1,800 MHz PCS services, tri-band planar inverted-F antenna (PIFA) covering 900 MHz GSM, 1,800 MHz PCS and 2.45 GHz Bluetooth, a multi-band inverted-F antenna covering the ISM bands at 2.45 and 5.8GHz, and U-NII at 5.15 and 5.25 GHz, and a wide-band antenna covering IMT-2000 and Bluetooth have been developed. The research team also successfully designed a GPRS dual-band built-in antenna for a tablet computer company. Other custom-made small antennas for various mobile applications and wireless connectivities will be designed.

Contact Information
Mr H Y Wong
Director, Technology Transfer Office
City University of Hong Kong
83 Tat Chee Avenue
Kowloon, Hong Kong
Tel : (852) 2788 8428
Fax : (852) 2788 9119
Email : hy.wong@cityu.edu.hk