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Varactor-tuned dual band filter-antenna for wireless applications

In this paper, a new dual-band filter-antenna with tunable center frequencies is designed. Frequency tuning is made possible by modifying the electrical length of the two short-stub resonators with four varactor-diode capacitors based on a conventional UWB antenna. The simulated results show that the center frequencies of the filter-antenna are 2.4GHz and 3.2GHz respectively. The separated modulation of two working frequency bands is achieved by adjusting the corresponding varactor-diode capacitors. The proposed antenna provides a new candidate for the design of dual-band filter-antenna.