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A novel type of printed and doubled‐sided dipole antenna with multiband operation for wireless local area networks and worldwide interoperability for microwave access is presented. The antenna is composed of several symmetrical branch strips dipoles which are employed as resonators for multiband operation and a modified rectangular ground plane as a reflector. Prototype of the proposed antenna has been constructed and experimentally studied. The measured results of the tri‐band not only explore wide −10 dB impedance bandwidths of 20, 14, and 15% at the operating bands of 2.5, 3.5, and 5.5 GHz respectively, but also show good agreement with the numerical predictions. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1019–1022, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26705

A novel coplanar waveguide (CPW)-fed printed monopole antenna with an n-shaped slot for dual-band operations is proposed. By etching an n-shaped slot on the radiating element, two tunable operating bands can be obtained. The measured results indicate that the impedance bandwidths of the proposed antenna, defined by 10-dB return loss, are 13.ABSTRACT: In this article, a low-cost, compact printed microstrip-fed circular monopole ultra-wideband antenna with dual band-notched function is proposed. By embedding a C-shaped slot on the circular radiating patch and a pair of L-shaped slots on the rectangular ground patch, dual band notched characteristics around 3.5 GHz for WiMAX and 5.5 GHz for wireless local-area network (WLAN) can be obtained. The proposed antenna is designed, fabricated, and tested. The measured results show UWB impedance bandwidth with dual notch, stable radiation patterns, and constant gain. The proposed antenna, with a compact dimension of 24 Â 36 mm 2 , operates over the frequency band from 2.5 to 10.6 GHz with S 11 À10 dB, except the over the dual notch bands of 3.3-4.2 and 5.1-5.9 GHz. Group delay and transfer function indicate that the antenna has good transient response. In addition, the radiation patterns are nearly omnidirectional in H-plane and typical monopole-like in E-plane. V C 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:242-246, 2012; View this article online at wileyonlinelibrary.com.

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This paper presents a synthesis technique of the dual offset shaped reflector antenna using Differential Evolution with Global and Local neighborhoods (DEGL) algorithm. The main reflector and subreflector are parameterized by Zernike polynomial expansion. With these expansion coefficients, the antenna is optimized to achieve a contoured beam covering the China territory in Ku-band. The performance of the antenna is calculated by Physical Optics (PO) and Physical Theory of Diffraction (PTD) techniques. The calculated results are validated by the commercial software GRASP9.3.01.