Abstract
A stepped impedance (SI) based frequency tunable dipole antenna for WLAN (2.4–2.48 GHz)/Bluetooth (2.4–2.48 GHz)/LTE (2–2.7 GHz)/wireless power transfer/UMTS (2.1 GHz)/WiMAX (2.5–2.7 GHz) applications has been investigated in this paper. The proposed antenna has an overall dimension of 0.408 λ0 × 0.245 λ0 × 0.013 λ0, where λ0 represents the free-space wavelength at the frequency 2.45 GHz. By embedding varactor diodes on the SI dipole antenna arms and varying the bias voltage, the effective electrical length of the antenna can be changed, leading to an electrically tunable antenna without changing the length of the antenna. The simulation and experiments are well matched and offer a 2:1 VSWR (S11 <−10 dB) bandwidth of 780 MHz. Experimental results show that by trimming the varactor diode, the operating frequency of the antenna can be electrically tuned from 1.98 to 2.76 GHz.
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