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An antenna designated mainly for cellular telephony purposes is presented. It covers one full band from 690 MHz to 2700 MHz with 6 dB return-loss criterion. The antenna is dimensioned 45 mm by 22.5 mm and is 0.8 mm in thickness. It is composed of a T-shaped monopole on the front-side and a meandered line on the back-side of an FR4 substrate. The T-shaped monopole is responsible for the high-band resonances. The meandered line is divided into three parts: the first part functions as a distributed inductor; the second part plays the role as a low-band resonator, and the third part is a tuning element. The distributed inductor and the low-band resonator are both folded strips in configuration, but with different spacing. The tuning element is used to improve the match so that one full band operation can be realized. To clarify the operational mechanism, modes separately generated from each part are analyzed and compared to modes of the proposed antenna.

ANTENNA WITH TWO FOLDED STRIPS COUPLED TO A T-SHAPED MONOPOLE