A planar meander‐line antenna consisting of three branch strips for very‐low‐profile GSM/DCS/PCS/WLAN triple‐band operation of mobile phones is presented. The branch strips are designed to operate as quarter‐wavelength structures at 900 and 1800 MHz, respectively, and the obtained impedance bandwidths cover the required bandwidths of the GSM (890–960 MHz), DCS/PCS (1710–1880/1850–1990 MHz), and WLAN (2400–2484 MHz) bands. The proposed antenna is 46.5 mm in width and 11 mm in height, and can be mounted on top of a mobile phone with a small distance of 2 mm to the ground plane, thus resulting in a very low profile of 13 mm (less than 4% of the wavelength at 900 MHz) from the ground plane for the proposed antenna in practical applications. The measured antenna‐radiation patterns are approximately omnidirectional at the three resonant frequencies. Peak antenna gains for operating frequencies across the GSM/DCS/PCS/WLAN triple bands are measured to be 1.1, 1.6, and 1.2 dBi, respectively, with gain variations within 0.5 dBi.
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Wu et al. (2004) studied this question.
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