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Tunable Inverted-L Antenna With Split-Ring Resonator Structure for Mobile Phones

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1 Author(s)
Takemura, N. ; ER Center, Samsung Yokohama Res. Inst., Yokohama, Japan

A design of a miniaturized tunable inverted-L antenna for mobile phones is proposed. The design integrates an inverted-L antenna with a split-ring resonator (SRR) structure. Although the use of SRRs to the inverted-L antenna achieves compact volume, the antenna's radiation efficiency rapidly decreases around the SRR's resonant frequency. The decrease is avoided by using a variable capacitance diode loaded on the SRR conductor. The proposed antenna has a compact volume of 1 × 10 × 50 mm3 (0.5 cm3), and can be tuned to the wide range, low frequency LTE700/GSM850/GSM900 bands (698-960 MHz). Simulation and measurement results showed the antenna obtains wideband and multi-band characteristics that enable it to cover the LTE700/GSM850/GSM900 and the LTE2600 bands.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:61 ,  Issue: 4 )