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Abstract
In this paper, a tunable dual-band antenna with an asymmetric Y-shaped microstrip line is proposed. The proposed antenna comprises an asymmetric Y-shaped microstrip line and an isosceles triangle-wide slot carved on the ground plane. By adjusting the angle of the Y-shaped microstrip line, desired center frequency of single-band can be obtained. With loading varactors, single-band and dual-band are achieved, which can be conveniently controlled. Simultaneously, the switchable behavior between the tunable single-band and the tunable dual-band is presented. The prototype is designed on F4B-2 substrate with a dielectric constant of 2.65, which occupied an overall size of 30 × 25 × 0.5 mm3. Simulated and measured results show that low- and high-frequency bands can be controlled through two varactors. The low-frequency channel ranging from 2.6 to 3.35 GHz can be realized, while the tunable high-frequency band ranges from 4.6 to 5.12 GHz. The low-frequency band can be adjusted while keeping the high-frequency band unchanged. Further, the proposed antenna has relatively stable radiation patterns during frequency tuning.
Acknowledgements
This work is supported by the National Natural Science Foundation of China (NNSF) under Grant 60990320, 60990323, 61271090, and the National 863 Project of China under Grant 2012AA012305, and Sichuan Provincial Science and technology support Project under Grant 2012GZ0101, and Chengdu Science and technology support Project under Grant 12DXYB347JH-002.