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Symmetric structures of single and dual-band metamaterial in the terahertz region are proposed, which composed of the electrical inductance-capacitance (ELC) resonate and electric field coupling resonate. Simulation results show that it can perform absorption peaks at one resonant frequency 0.716 THz with the absorption more than 95%, and at two distinct resonant frequencies 0.612 THz and 1.086 THz with the absorption above 90%. These models have the advantages of simple structure and strong absorption, due to the well-separating of different resonances in the particle, this metamaterial shows potentially application promises in the design of multiband terahertz devices.

Terahertz filter based on a composite metal-dielectric-metal structure is proposed. Different transmission characteristics of stop-band are shown for different polarizations of the THz radiation. The causes of dual-layer structure with characteristics of filter have been analyzed qualitatively using simple cascading multiplication. The near-field distributions of the planar microstructures are given to further elaborate the mechanisms of filter. Besides, tuning bandwidths and center frequencies can be realized by modulating the main parameters of the structure.

A small-sized compact CPW feed ultra-wideband (UWB) antenna with dual-band notched characteristic is proposed. The antenna consists of the radiation pattern, ground plane and the CPW feed on one side of the substrate, which is used to support the antenna and on the other side are two resonators with filter characteristic. By integrating the filters with the antenna, the antenna can suppress the WLAN band (5.15 ~ 5.35 GHz and 5.725 ~ 5.825 GHz) successfully which makes the use of the frequency resource and decreases the electromagnetic interference (EMI). The size of the band-rejected antenna is small, just 24 mm × 30 mm × 0.5 mm.

A new ultra-wideband (UWB) antenna with an acceptable band-rejection characteristic utilizing Left-Handed Medium (LHM) is presented. By adding open-ended slot which is etched in the radiating patch created the first notched band in 3.3-3.7 GHz for the WiMAX system. In addition, two pair of LHM elements close to the feed line, band-notch properties in the lower WLAN 5.15-5.35 GHz and higher WLAN 5.725-5.825 GHz bands and downlink of X-band satellite communication systems 7.25-7.75 GHz bands are achieved.