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In this paper, a waveguide antenna with miniaturized-aperture using a single split-ring-resonator (SRR) is proposed. A wide bandwidth is achieved by using a single SRR and optimizing the distance between it and the ridge end. The measured bandwidth of 3.40-3.54 GHz (a fractional bandwidth of 4.03%) is much wider than that of the previous waveguide antenna using multiple rings (4.96-5.00 GHz with a...
In this paper, the varactor-loaded open-ring microstrip antenna is proposed. To overcome the inherent characteristics of narrow bandwidth of the open-ring microstrip antenna, the varactor is positioned on the edge of the ring. The frequency is tuned by controlling the DC voltage connected to the varactor. For the simulation model, instead of the real varactor, the discrete capacitor is used. The return...
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