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The objective of this paper is to design a compact multiband monopole antenna for a PDA phone. Using a simple inverted-U-shaped driven element, we observe that the proposed antenna resonates in the high-frequency band (1700-2568 MHz) for DCS, PCS, UMTS, and WLAN applications. The low-frequency bandwidth (881-1280 MHz), which covers the GSM band, is accomplished by a novel dual low-frequency mode method. The overall dimensions of this proposed antenna are 100 mm (length) × 60 mm (width) × 0.8 mm (thickness); it can easily fit into PDA phones and WLAN products. Herein, the design procedures and the simulated and measured values of return losses, radiation patterns, gain, and efficiency are presented and discussed.

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