Abstract
A wideband slotted multifunctional reconflgurable an- tenna is proposed for WLAN/WiMAX/UWB/PCS-DCS/UMTS appli- cations. The proposed antenna consists of monopole and spiral sections and microstrip feeding. A microstrip patch on FR4 substrate provides wideband return loss for each application. Total area of the antenna is 34£45mm 2 that satisfles all the requirements for difierent applications in a low proflle structure. Reconflgurable design is used in this antenna using RF MEMS switches. The proposed antenna has a nearly omni- directional radiation patterns (doughnut shape) in difierent frequency bands. The notch is embedded in the ground plane to improve the impedance matching, and the dimensions of this notch are optimized. Moreover, the variation of group delay is about §2ns in UWB applica- tion. Also a prototype of the proposed antenna is fabricated, and the results are compared with those obtained from simulations. Measured return losses are in good agreement with simulated ones. The proposed antenna has the advantages of multifunctional operation, low proflle, low cost and omnidirectional pattern.
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