A Novel Frequency-tunable Antenna with a Wide Tuning Range

In this paper a varactor-loaded antenna with a wide tuning range and good di- rectivity is designed. The variable capacitance diode loading method is taking in detail, which enables the impedance matching from 1.9GHz to 2.56GHz for VSWR • 2. The HFSS and ADS software simulate this antenna independently, and the results show that it realizes a 500MHz tunable range, from 1.44GHz to 2.06GHz in HFSS, and 1.944GHz to 2.568GHz in ADS, more- over, there exists a perfect matching resistor. At the same time, the shape of the H radiation pattern is nearly omnidirectional at those chosen frequency points. This paper uses the vector network analyzer to test the S parameter of the fabricated antenna. It shows that this antenna realizes 370MHz tunable range, from 1.52GHz to 1.89GHz. This proposed design has a simple structure and a compact dimension of 24:2mm £ 32mm £ 1:5mm.

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