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In this work, we present a flat lens design using the Dial-a-Dielectric (DaD) and 3D-printing technique to realize the materials that are not available off-the-shelf. We design the proposed flat lens and compare its performance with that of the ray-optics (RO)-based lens. We find from the results that both designs show comparable performance.
Single phase multiferroic La0.8Bi0.2Fe0.7Mn0.3O3 thin film is grown successfully on LaNiO3 buffer with LaAlO3 as substrate using RF sputtering. Structural studies show the presence of strain in the thin film with slight expansion in unit cell compared to bulk form. Root mean square (rms) value of surface roughness is ~1.703nm with grain size of ~20nm. Dielectric studies reveal the dispersion behaviour...
This paper presents the design of a flat lens, which utilizes multilayer frequency selective surfaces (FSSs) in free space. The lens can be space-qualified since, unlike conventional designs for lenses, it does not need to use dielectric materials. The paper describes a systematic procedure for realizing the requisite radially varying phase shifts, by using locally-periodic multilayer FSSs to realize...
In this work, we discuss ways to mitigate several problem with Metamaterials (MTMs), and discuss strategies for artificially synthesizing dielectric materials that are broadband and low-loss and, hence, are useful for real-world antenna applications involving low-profile flat lenses and reflectarrays, for example.
In this paper, a dual segment two element wideband cylindrical dielectric resonator antenna array with annular shaped corporate feed network is presented. To enhance impedance bandwidth, multisegmentation concept with shifted center has been pragmatic. Annular shaped microstrip parallel feed with quarter wave transformer etched on a single side of the copper grounded substrate (εr=4.4) is used to...
In this paper, triple band cylindrical dielectric resonator antenna with a novel mirostrip line feed is examined. Triangular shaped mirostrip line generates two different modes (i.e. HE11δ and TM01δ) in CDRA at 3.20 GHz and 5.37 GHz respectively. The proposed antenna design operates in three different frequency bands i.e. 2.55–2.68 GHz; 2.96–3.59 GHz; 5.19–6.19 GHz with the fractional bandwidth of...
In this paper, tri band dual segment ring dielectric resonator antenna with partial ground plane is presented. Proposed ring shape DRA is excited by modified microstrip line. Two different modes i.e. TM01δ and HE11δ are generated in ring DRA at 3.45 GHz and 5.41 GHz respectively. The proposed design operates in three different frequency bands i.e. 2.17 – 2.46 GHz; 3.17–4 GHz; 5–6.5 GHz with the fractional...
In this work, we present low profile lens and reflectarray design for millimeter wave. We use artificially engineered dielectric materials (Dial-a-Dielectric) for these designs. We present comparison results with legacy designs that show comparable or better performance. We compare results of a flat lens using commercial off-the-shelf (COTS) materials, as opposed to metamaterials that are often required...
Analysis of strip excited triangular shape dielectric resonator antenna (TDRA) using Finite Difference Time Domain (FDTD) numerical technique is presented. The calculated values of resonant frequencies using FDTD method have been compared with predicted resonant frequencies values using Dielectric Waveguide Method. The numerical and theoretical results are found in good agreement, which validate this...
In this paper, a wideband four element quarter split cylindrical dielectric resonator antenna (CDRA) designed for 5.0 GHz WLAN and WiMAX band. The input characteristics and far field pattern of the proposed antenna has been studied through Ansoft HFSS simulation software. The |S11| characteristics of the proposed antenna and single element quarter split CDRA of the same size has been compared. The...
In this work, we present a new systematic technique for the design of a flat lens using modified commercial off-the-shelf (COTS) materials, as opposed to metamaterials that are often required in lens designs based on the Transformation Optics (TO) approach. While lens designs based on Ray Optics (RO) do not suffer from the above drawback of having to use metamaterials, they still require dielectric...
An antenna design is presented for WLAN applications at the center frequencies of 5.2(5.15–5.35) GHz and 5.8(5.725–5.825) GHz. Patch antenna size reduction and reasonable bandwidth is achieved in this work. Four CSSRR have been etched in the ground plane to achieve dual band operation. The proposed antenna provides good flexibility on selection of dual frequency operation by modifying dimension of...
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