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In this paper a new equivalent circuit for the EBG structure which represent the feature of surface-wave suppression is proposed. The equivalent circuit of the EBG unit cell consists of capacitors, inductors and transmission lines of series branches, as well as a capacitor and an inductor of shunt branch. These equivalent circuit parameters are based on physical implementations of EBG structures....
Slotted waveguide array antenna with no grating lobes is designed and performance is evaluated by simulation. Grating lobes are suppressed by shortening the slot spacing or the effective guided wavelength in the waveguide by using metamaterial technique. Effect to suppress the grating lobe is confirmed by simulation of radiation pattern.
In this paper, the proposed small antenna, which using negative permittivity meta-material structure is designed, achieves wide Q more than calculated QL of chu limits. The equivalent circuit of proposed antenna is realized by Ansoft designer. The proposed small antenna is optimized by 3-D field simulation tool, CST MWS(micro wave studio).
In this paper, a wideband EBG structure with an enhanced bandgap and homogeneity by loading lumped-elements is presented. Lumped-element capacitors are loaded between the adjacent patch conductors, and also lumped-element inductors are loaded in series with vertical vias in the proposed EBG, leading to a drastic reduction of the unit cell size, and consequently, an enhanced homogeneity. In addition,...
In this paper, the UHF RFID tag antenna which has a SRR as a radiating part and inductively coupled feeding method are analyzed and designed. By using a SRR, the antenna size can be reduced and using an inductively coupled feeding method, we can obtain a wide bandwidth and a simple matching technique to directly attach to a tag chip. Also equivalent circuit model of the tag antenna is presented and...
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