Abstract-A new compact ultrawideband (UWB) patch antenna based on the resonance mechanism of a composite right/left-handed (CRLH) transmission line (TL) is proposed. The radiating element of the antenna is made from three left-handed (LH) metamaterial (MTM) unit cells placed along one axis, where each unit cell combines a modified split-ring resonator (SRR) structure with capacitively loaded strips (CLS). An analysis of the eigenfrequencies of these unit cells yields one-and two-dimensional dispersion diagrams, which correspond to a one-unit cell antenna and the three unit cell antenna, respectively. A trident feed and a slotted-partial ground plane are used to match the right-and left-handed (RH and LH) modes of the antenna, respectively. In addition, an analysis of the surface current distribution of the antenna shows that slots on the metallic area reduce the Q-factor. This reduction in the Q-factor results in a wide bandwidth of 189% at 3.7 GHz, which spans the UWB frequency range between 2.9-9.9 GHz. The total footprint of the antenna at the lowest frequency is 0.2λ 0 ×0.2λ 0 ×0.015λ 0 , where λ 0 is the free space wavelength. The gain of the antenna ranges between −1 to 5 dB throughout the frequency band.

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A printed dipole antenna for various wireless application is proposed. The printed dipole was loaded with metamaterial-inspired loading in order to improve matching. A slotted and stepped ground plane was then used to enhance the bandwidth. The antenna has a total bandwidth of 56 % at the lowest resonant frequency and an overall size of λ 0 /3.4 x λ 0 /13.3 x λ 0 /375. The gain of the antenna is 2 dB Index Terms-Metamaterial-loading, dipole antenna, bandwidth enhancement.

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