A small-sized (radiator ≃10×8 mm) microstrip monopole antenna for reconfigurable macro-micro frequency tuning is presented. The proposed antenna operates in WiBro (2.3–2.4 GHz) and WLAN 802.11a/b (2.4–2.48 GHz/5.15–5.35 GHz) service bands with a constant antenna gain. Two frequency tuning diodes, a pin diode and a varactor, are incorporated into a meander type radiator. The pin diode is used for frequency switching (macro-tuning) between 2 GHz band and 5 GHz band. In addition, the varactor is used for frequency tuning (micro-tuning) within wireless service bands (2.3–2.48 GHz and 5.15–5.35 GHz) to produce constant antenna gain.
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Jung et al. (2007) studied this question.
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