Design of anisotropic zero-index metamaterial loaded tapered slot vivaldi antenna for microwave imaging

Bhaskar, Manoj; Akhter, Zubair; Gupta, Sagar V.; Akhtar, M. Jaleel

doi:10.1109/aps.2014.6905123

Cited by 13 publications

(9 citation statements)

References 5 publications

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“…The dimensions and geometry of the simulated AZIM cell structure are shown in Figure , and the extracted permittivity profile is plotted in Figure . The directivity of the AZIM‐loaded antenna is enhanced by 2.6 dB, and the half power beam width is improved by 80° in the frequency range of 6.8 GHz to 10 GHz as compared to that of simple Vivaldi antenna [ Bhaskar et al , ]. Figure shows the typical structure of a Vivaldi antenna loaded with AZIM cells in order to enhance the directivity of the antenna.…”

Section: Antenna Designmentioning

confidence: 99%

Simplified two‐dimensional microwave imaging scheme using metamaterial‐loaded Vivaldi antenna

et al. 2017

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In this paper, a highly efficient, low‐cost scheme for two‐dimensional microwave imaging is proposed. To this end, the AZIM (anisotropic zero index metamaterial) cell‐loaded Vivaldi antenna is designed and tested as effective electromagnetic radiation beam source required in the microwave imaging scheme. The designed antenna is first individually tested in the anechoic chamber, and its directivity along with the radiation pattern is obtained. The measurement setup for the imaging here involves a vector network analyzer, the AZIM cell‐loaded ultra‐wideband Vivaldi antenna, and other associated microwave components. The potential of the designed antenna for the microwave imaging is tested by first obtaining the two‐dimensional reflectivity images of metallic samples of different shapes placed in front of the antenna, using the proposed scheme. In the next step, these sets of samples are hidden behind wooden blocks of different thicknesses and the reflectivity image of the test media is reconstructed by using the proposed scheme. Finally, the reflectivity images of various dielectric samples (Teflon, Plexiglas, permanent magnet moving coil) along with the copper sheet placed on a piece of cardboard are reconstructed by using the proposed setup. The images obtained for each case are plotted and compared with the actual objects, and a close match is observed which shows the applicability of the proposed scheme for through‐wall imaging and the detection of concealed objects.

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Section: Antenna Designmentioning

confidence: 99%

Simplified two‐dimensional microwave imaging scheme using metamaterial‐loaded Vivaldi antenna

et al. 2017

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“…In this section, the basic geometry configurations of the TSVA [2] and the proposed FSVA with front and back views are shown in Figures 1 and 2, respectively.…”

Section: Design Of Four-slot Vivaldi Antennamentioning

confidence: 99%

“…The ultra-wide band (UWB) characteristic of the TSVA results into numerous applications in various fields such as microwave imaging [2], vehicular communication [3], radio astronomy [4] and high speed communication systems. It is a preferred choice over the horn antenna especially for microwave imaging and nondestructive testing (NDT) due to ease of fabrication in planar technology, low cost, ultra-wide bandwidth and relatively small size.…”

Section: Introductionmentioning

confidence: 99%

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Sub-Surface Microwave Imaging Using Four-Slot Vivaldi Antenna with Improved Directivity

2016

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The conventional tapered slot Vivaldi antenna is well known for its ultra-wide band characteristics with low directivity. To improve the directivity of the conventional Vivaldi antenna, a four-slot Vivaldi antenna (FSVA) is proposed here to operate in the frequency range of 2-11 GHz. For feeding the FSVA, a binomial three-section V-shaped even mode power divider with progressing T-junctions is also designed and tested here, which is then integrated with the antenna. The proposed antenna prototype is designed and fabricated on a 1-mm thick FR-4 substrate (ɛ r = 4.3, tanδ = 0.025), and the return loss and radiation characteristics are investigated in the anechoic environment. The measured result shows a good agreement with the numerical simulation performed using the EM Simulator i. e. CST MWS-2015. It is found that the directivity of FSVA is approximately doubled as compared to that of the conventional Vivaldi antenna having the same dimensions. From the application point of view, the fabricated antenna is used to image various metallic objects hidden inside the sand using a vector network analyzer and associated RF components. The obtained 2D microwave images of the test media successfully show that the hidden objects can effectively be located and detected using the proposed FSVA in conjunction with a simple imaging scheme.

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“…In recent years, there is a lot of interest to integrate various types of metamaterial unit cells with the tapered slot Vivaldi antenna (TSVA) to improve the overall radiation characteristics . The Vivaldi antennas are already well known for their UWB characteristics which can be further improved using extended ground plane stubs .…”

Section: Introductionmentioning

confidence: 99%

Gain enhancement of the Vivaldi antenna with band notch characteristics using zero-index metamaterial

Bhaskar

Johari

Akhter

et al. 2015

Microw. Opt. Technol. Lett.

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In this letter, a tapered slot ultrawide band (UWB) Vivaldi antenna with enhanced gain having band notch characteristics in the WLAN/WiMAX band is presented. In this framework, a reference tapered slot Vivaldi antenna is first designed for UWB operation that is, 3.1–10.6 GHz using the standard procedure. The band‐notch operation at 4.8 GHz is achieved with the help of especially designed complementary split ring resonator (CSRR) cell placed near the excitation point of the antenna. Further, the gain of the designed antenna is enhanced substantially with the help of anisotropic zero index metamaterial (AZIM) cells, which are optimized and positioned on the substrate in a particular fashion. In order to check the novelty of the design procedure, three distinct Vivaldi structures are fabricated and tested. Experimental data show quite good agreement with the simulated results. As the proposed antenna can minimize the electromagnetic interference (EMI) caused by the IEEE 802.11 WLAN/WiMAX standards, it can be used more efficiently in the UWB frequency band. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:233–238, 2016

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Design of anisotropic zero-index metamaterial loaded tapered slot vivaldi antenna for microwave imaging

Cited by 13 publications

References 5 publications

Simplified two‐dimensional microwave imaging scheme using metamaterial‐loaded Vivaldi antenna

Simplified two‐dimensional microwave imaging scheme using metamaterial‐loaded Vivaldi antenna

Sub-Surface Microwave Imaging Using Four-Slot Vivaldi Antenna with Improved Directivity

Gain enhancement of the Vivaldi antenna with band notch characteristics using zero-index metamaterial

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