COMPACT PLANAR HEXA-BAND INVERTED-F ANTENNA FOR MOBILE PHONE APPLICATION

摘要

This article presents a compact multiband planar inverted-F antenna design for mobile phone applications. The proposed antenna comprises dual twisted lines, a shorting strip and an L-shaped coupling strip. The dual twisted lines are excited by the coupling strip to generate four resonance modes around 900, 1800, 2100, and 3500 MHz and covers six bands including the global system for mobile communication 850/900 (824-894 MHz), (880-960 MHz), digital communication system (1710-1880 MHz), personal communication system (1850-1990 MHz) universal mobile telecommunication system (1920-2170 MHz) and worldwide interoperability for microwave access (3400-3600 MHz). The antenna shows a planar structure and occupies a very small-size of 15 × 26 mm~2, making it especially suit for mobile phone applications. This research performed simulation by high frequency structure simulation and CST to design and analyze the antenna, and a practical structure was fabricated and tested. The measured and simulated return loss show good agreement. Moreover, the radiation patterns and the specific absorption rate are discussed too.