Abstract
The slot antennas are highly attractive in modern wireless applications because of many advantages, including low profile, broad bandwidth, and depressed surface-wave interaction. Many techniques of size reduction for slot antennas have been proposed in recent years. For a conventional half-wavelength slot antenna, increasing the electrical length of slot by meandering it is one of the solutions [1]. However, this method has drawbacks of narrow bandwidth and low radiation efficiency. Another approach for reducing the physical slot length is to use the stepped impedance resonator (SIR) [2]. By adjusting the impedance ratio and the electrical lengths of two slot-line sections, the SIR slot may resonate at a shorter physical length for the same operational frequency. Conventionally, a half-wave slot antenna has two short circuits at both ends of the slot satisfying the resonant boundary condition. However, by imposing appropriate reactive terminations at the ends of a slot, the resonant length of a slot antenna can be arbitrarily chosen [3]. Additionally, the slow wave concept can also be employed for a miniaturized slot-loop antenna by using periodic loading capacitors [4] or split-ring resonators (SRRs) [5] inside the slot.
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