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This paper presents a technique to design electromagnetic devices by a combination of evolutionary algorithm and electromagnetic (EM) simulation. This technique, named simulation-driven particle swarm optimization (SDPSO), exploits particle swarm optimization (PSO) to design a microwave component matched to user's requirements. To justify the need for such SDPSO, a performance comparison is made between...
This paper presents two types of novel horn antennas realized as defects in EBG structures. A concept evanescent feeding of EBG horn antennas is introduced. An evanescently-fed EBG horn antenna operating in F band was designed and its Ku band scaled-up prototype was fabricated and measured. A solution for creating pyramidal EBG horn antennas with symmetrical radiation pattern in both E- and H-planes...
In this paper, the possibility of employing a microstrip based technology periodic structure for the purpose of low cost sensing is discussed. The CAD model for the purposed device is discussed. Moreover, the electromagnetic response of such a fixed-geometry passive structure can vary when the characteristics of a single layer or several layers fluctuate due an external stimulus. For example, by observing...
A planar antenna that utilize surface waves (SWs) for leaky wave (LW) excitation is investigated. Specifically, a surface-wave launcher (SWL) is employed to excite cylindrical SWs which are bound to a grounded dielectric slab (GDS). By the addition of a grid of width-modulated printed strips, a high impedance surface (HIS) can be realized, providing appropriate conditions for LW radiation. A planar...
Quantification of bandwidth for surface waves in a periodic Fabry-Perot cavity-like structure with one grounded plane and one loaded terminal plane is presented. The loads are twin shapes printed on the two surfaces of a dielectric layer. In particular, dog-bone and hourglass-like shapes are considered and compared. Numerical investigations demonstrate the dependency of surface-wave stop-band limits...
An inherent transmission problem associated with modern energy-saving glass windows is analyzed. These windows are used in building design to provide thermal insulation which keeps the interior warmer in the winter and cooler in the summer. This thermal insulation is achieved by employing a very thin layer of metallic oxide on one side of the ordinary (float) glass. This layer attenuates infrared...
Most high-gain antennas are narrow band and most wideband antennas have low gains. In this paper we present a low-profile antenna with a large impedance bandwidth, and high gain over the large impedance bandwidth. This is achieved by integrating a wideband hybrid DR on patch (DRoP) with a surface-mounted short horn (SMSH). Performance of antennas with two types of DRoP configurations are studied....
A new combination of proximity coupled circular microstrip antenna and a square quasi-planar surface mounted short horn is proposed to increase the gain of a compact circularly polarized antenna by 4.2 dB. This antenna structure has gain 10.39 dBi and over 3 dB beam-width ( 52deg) the axial ratio (AR) is 0.11 dB and the 3 dB AR bandwidth is 1.89%. The patch structure has 13% size reduction over normal...
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