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A CPW fed slot antenna on FR4 substrate has been designed to resonate at 5GHz. The gain of the designed antenna has been improved by adding very thin layers of dielectric coated with metal. The layers have same area as that of the substrate and are added directly on the ground plane of the antenna. Gain of the antenna increases gradually with subsequent addition of laminated conductor layers. After...
In this paper, printed regular hexagonal monopole antenna fed by a microstrip line has been presented for ultra wide bandwidth. The antenna is then modified to possess band rejection at the wireless local area network (WLAN) (5.1–5.8 GHz) by an inverted U-shape slot within the radiating patch. The length and width of the U-shape slot offer sufficient freedom for selecting and shifting the notched...
A design of proximity coupled microstrip dipole antenna with enhanced bandwidth and gain is presented in this paper. Comparative study with coaxial fed design has been done. Also dual-frequency operation using proximity coupled microstrip dipole antenna is implemented with good bandwidth at both the frequencies.
Concentric Circular Antenna Array (CCAA) has several interesting features that makes it indispensable in mobile and communication applications. Here we have considered a uniform arrangement of elements where the inter-element spacing is kept half a wavelength. The main aim is to reduce the sidelobe levels and the primary lobe beamwidth as much as possible. Central to our design is a hybridization...
In this paper, a circular array antennas lying on x-y plane is assumed. The array is assumed to have the maximum radiation along positive z-axis. Design goal in this paper is to find the optimum angular locations of the elements so as to get the radiation with the lowest possible maximum sidelobe (SLL) with least first null beamwidth (BWFN) increment. Optimum locations of elements are found using...
In this paper the synthesis of linear array geometry with minimum sidelobe level using a new class of Particle Swarm Optimization technique namely Novel Particle Swarm Optimization (NPSO) is described. The NPSO algorithm is a newly proposed, high-performance evolutionary algorithm capable of solving general N-dimensional, linear and nonlinear optimization problems. Compared to other evolutionary methods...
In this article we describe an optimization-based design method for non-uniform, planar, and circular antenna arrays with the objective of achieving minimum side lobe levels for a specific first null beamwidth and also a minimum size of the circumference. Central to our design is a hybridization of two prominent metaheuristics of current interest namely the Invasive Weed Optimization (IWO) and the...
In this paper the beam pattern, sidelobe level and beamwidth of a linear antenna array are examined. Shifting the focus from physical construction to electrical design, one may broadly classify the linear array design into two major categories: uniformly excited arrays and non-uniformly excited arrays. The current text assumes non-uniform excitation and manifests a design goal of maximizing sidelobe...
In this paper, a wideband planar multi resonator antenna with parasitic coupling is proposed and studied. Impedance and radiation characteristics of this antenna are presented and discussed. From the results, it has been observed that, the Impedance bandwidth, defined by 10 dB return loss, can reach an operating bandwidth of 251 MHz with center operating frequency of 3023 MHz, which is about four...
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