OMNI DIRECTIONAL PLANAR MICROSTRIP ANTENNA
CPW-FED MULTI-BAND OMNI-DIRECTIONAL PLANAR MICROSTRIP ANTENNA USING COMPOSITE METAMATERIAL RESONATORS FOR WIRELESS COMMUNICATIONS A novel approach for the design of a compact multiband planar microstrip antenna is presented.This type of antenna is composed of composite metamaterial resonators (including conditional microstrip resonators and metamaterial resonators), and fed by signal feed.A sample antenna with composite closed-ring resonator and split-ring resonator (SRR) fed by 50 Ω coplanar waveguide (CPW) developed on FR4 epoxy substrate for multi-band wireless communication applications is presented.Appropriate design of the composite structure resulted in three discontinuous resonant bands. The fundamental magnetic resonant and electric resonant frequency of SRR and the first electric resonant frequency of the closed-ring resonator were combined to form low, middle, and high resonant band. The properties of this antenna are investigated by theoretical analysis and finite element method (FEM) simulations.The numerical results show that the proposed antenna has good impedance bandwidth and radiation characteristics in the three operating bands which cover the required band widths of the 2.4/5.2/5.8 GHz wireless local-area networks (WLAN) and 3.5/5.5 GHz worldwide interoperability for microwave access (WiMax) with return loss of better than 10 dB.The antenna also has stably omni-directional H-plane radiation patterns within the three operating bands. Metamaterial is artificial material that may exhibit electromagnetic (EM) responses not readily found in natural.In recent years, it has gained considerable attention since its unique EM characteristics can134 Si and Lv be advantageous in design of novel EM components and devices [1–10]. One example is that the simultaneous effective negative permittivity ε and permeability µ feature of one type of metamaterials (called lefthanded materials) can induce negative index of refraction, reversal of Doppler shift, and reversal of Cerenkov radiation phenomena [1– 4].It may be used for making perfect lens [5, 6], or even invisibility cloaks [7, 8].Other examples are that electromagnetic/photonic band gap (EBG/PBG) and artificial magnetic metamaterial have already been used for antennas design, which might open the door to obtain the compact (sub-wavelength) and high performance EM components and devices.
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COMPACT ULTRA WIDEBAND MICROSTRIP ANTENNA WITH MULTIPLE NOTCHES
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