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A frequency reconfigurable dualband antenna is demonstrated, where the antenna's conductor consists of a radiating conductor, lumped and distributed elements, and varactors. An analytical expression for current distribution, input impedance, and radiated power is derived by connecting electromagnetic fields inside and outside the antenna's sphere for an electrically small antenna. With the formulae,...
In this letter, the application of a variable characteristic impedance transmission line that can be used to design a dual-band bandpass filter (BPF) is presented. The proposed filter offers a fixed first passband and a controllable second passband. The tuning of the second passband is achieved by varying the characteristic impedance of the shunt open stub of stub loaded resonator (SLR) with the help...
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