This article explains a novel approach for achieving wideband characteristics in case of dielectric resonator antenna (DRA). Wideband characteristic has been realized by uniting the concept of vastu purusha mandala (VPM)-based fractal geometry with dielectric resonator antenna. VPM is Hindu religion-based fractal geometry, which provides the advantage of decrease in volume to surface area of the radiator. This concept is useful to enhance impedance bandwidth of proposed antenna. For the purpose of validation, prototype of proposed antenna design has been fabricated as well as tested. After experimental testing, it is confirmed that the proposed radiator functions over the frequency range 2.6-4.34 GHz with a percentage bandwidth of 46.52%. The proposed radiating arrangement provides peak gain of 6.3 dBi and stable far-field characteristics. All these features make it applicable for WiMAX application (3.3 GHz).
K E Y W O R D Sdielectric resonator antenna, fractal shape, Q-factor, wideband antenna
In this article, a modified circular ring shaped slot antenna is presented for dual-band wireless applications. Dual frequency bands are achieved by combining the circular ring shaped slot with U-shaped slot. Analysis of proposed radiator has been carried out on HFSS EM simulator. For experimental verification, the prototype of proposed radiator is fabricated and tested. Experimental results confirm that the proposed radiator operates over dual frequency bands, that is, 1.69 to 1.94 GHz and 3.64 to 3.88 GHz with the impedance bandwidth of 14.1% and 6.4%, respectively. Far-field features of proposed radiator are stable and confirm its better performance in between dual frequency range. The proposed antenna can be used for global system for mobile (GSM) (1.8 GHz) and Worldwide Interoperability for Microwave Access (WiMAX) (3.7 GHz) applications. K E Y W O R D S dual-band, GSM, slot antenna, U-shaped slot, WiMAX
In this article, design and analysis of a modified circular slot antenna is discussed. The proposed antenna design is attractive because of two important reasons: (i) modified circular slot creates dual operating bands; (ii) stable radiation characteristics over the operating frequency bands are observed. The complete analysis of proposed radiator has been done on Ansys HFSS simulation software. For verifying the simulated outcomes, a prototype of antenna structure is fabricated and tested. Measured results show that the proposed antenna operates over two frequency bands, i.e., 2.88-3.92 GHz and 5.26-6.28 GHz with the fractional bandwidths of 31% and 17% respectively. Experimentally measured average gain of the proposed radiator is 3 dBi and 6 dBi in lower and upper frequency bands, respectively. All these features of the proposed antenna make it appropriate for WiMAX (3.5 GHz) and WLAN (5.8 GHz) applications.
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