Gain Enhancement of a Millimeter Wave Antipodal Vivaldi Antenna by Epsilon-Near-Zero Metamaterial

El-Nady, Shaza; Zamel, Hany M.; Hendy, Moataza; Zekry, Abdelhalim; Attiya, Ahmed M.

doi:10.2528/pierc18050302

Cited by 32 publications

(11 citation statements)

References 7 publications

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“…There are many more advantages of using metamaterial in antenna design, for example, hike in gain and bandwidth, noticeable reduction in the size of an antenna, negligible surface waves, and fewer sidelobes. Recent developments show that single negative, double negative and anisotropic metamaterials are used in AVA antenna design [5], [9], [28]- [31].…”

Section: Performance Enhancement Techniques For Avamentioning

confidence: 99%

“…Zero index metamaterial by using non-uniform zig-zag structures is implemented above the aperture area of the antipodal Vivaldi antenna in [5] which provides good radiation pattern, low sidelobes, and narrow beamwidth. In [9], gain enhancement of a millimeter-wave AVA by Epsilon-Near-Zero metamaterial is proposed. In this H shaped metamaterial unit cells are implemented on the triangular shape which is above the aperture area of AVA.…”

Section: H Metamaterialsmentioning

confidence: 99%

“…Different metamaterial Unit Cell (MUC) designs are given in figure 20 and an overview of AVA with metamaterial design comparison is presented in table 8. Enhanced gain, compact, improved return loss and wider bandwidth are implemented in [9] by using modified H shaped metamaterial on the dielectric lens. Further, the smallest size AVA with modified I shaped metamaterial is implemented in [80].…”

Section: H Metamaterialsmentioning

confidence: 99%

“…From all these comparisons, we can say that deciding the shape and position of metamaterial is the daunting task. Figure 21(a) is the typical fabricated AVA with epsilon near zero(ENZ) metamaterial [9]. Modified H shaped metamaterial is present on a triangular-shaped dielectric lens.…”

Section: H Metamaterialsmentioning

confidence: 99%

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A Survey of Performance Enhancement Techniques of Antipodal Vivaldi Antenna

2020

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The increasing proliferation of advanced devices for UWB, 5G communication, micrometerwave, and millimeter-wave communication demands an antenna which can handle huge data rates, provides high gain and stable radiation pattern as a panacea of most of the current wireless communication problems. Many different antenna designs have been proposed by the researchers but, Antipodal Vivaldi Antenna (AVA) has drawn the attention of most of the researchers because of its high gain, wide bandwidth, less radiation loss, and stable radiation pattern. Different methods are presented to make AVA more compact while maintaining the performance of an antenna to an acceptable level. These different methods are substrate choice, flare shape, slots, and feeding connectors. Also, AVA performance can be enhanced by incorporating corrugation, dielectric lens, patch in between two flares of AVA, balanced AVA (BAVA), metamaterial, computational intelligence (CI), and AVA array. The AVA performance enhancement techniques modify the electrical and physical properties of an antenna which in turn improves its performance. A large number of performance enhancement methods of AVA design have been proposed, however, no comprehensive study exists to categorize these performance enhancement techniques and outline their concepts, advantages, disadvantages, and applications. So, in this paper, we have attempted to outline all methods available for enhancing and optimizing the parameters of AVA. Additionally, to validate some of the important performance enhancement methods, they are incorporated in the basic conventional AVA design and further simulation results are obtained for the same which are in line with the surveyed literature. Each method is explained in detail by incorporating its key points, merits, and demerits. Moreover, illustrations from the literature are given to demonstrate improvement in the parameters as a result of applying a particular performance enhancement technique. INDEX TERMS Antipodal Vivaldi antenna (AVA), AVA array, balanced antipodal Vivaldi antenna (BAVA), corrugations, dielectric lens, metamaterial, parasitic patch, slots.

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Section: Performance Enhancement Techniques For Avamentioning

confidence: 99%

Section: H Metamaterialsmentioning

confidence: 99%

Section: H Metamaterialsmentioning

confidence: 99%

Section: H Metamaterialsmentioning

confidence: 99%

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A Survey of Performance Enhancement Techniques of Antipodal Vivaldi Antenna

2020

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“…In this context, researchers have developed and investigated the extraordinary properties of metamaterials and have come up with many designs, such as complementary split-ring resonators [ 12 ], elliptical split-ring resonators [ 13 ], omega-shaped metamaterials [ 14 ], and so on. Due to their unique electromagnetic properties, they can be used in invisibility cloaks [ 15 ], gain enhancement [ 16 ], filters [ 17 ], sensors [ 18 ], highly directive subwavelength cavity antennas [ 19 , 20 , 21 ], etc. Metamaterial structures have been adopted by many researchers because of their cost effectiveness, size reduction, and label-free detection.…”

Section: Introductionmentioning

confidence: 99%

A Compact Ultrawideband Antenna Based on Hexagonal Split-Ring Resonator for pH Sensor Application

Islam

Ashraf

Alam

et al. 2018

Sensors

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A compact ultrawideband (UWB) antenna based on a hexagonal split-ring resonator (HSRR) is presented in this paper for sensing the pH factor. The modified HSRR is a new concept regarding the conventional square split-ring resonator (SSRR). Two HSRRs are interconnected with a strip line and a split in one HSRR is introduced to increase the electrical length and coupling effect. The presented UWB antenna consists of three unit cells on top of the radiating patch element. This combination of UWB antenna and HSRR gives double-negative characteristics which increase the sensitivity of the UWB antenna for the pH sensor. The proposed ultrawideband antenna metamaterial sensor was designed and fabricated on FR-4 substrate. The electrical length of the proposed metamaterial antenna sensor is 0.238 × 0.194 × 0.016 λ, where λ is the lowest frequency of 3 GHz. The fractional bandwidth and bandwidth dimension ratio were achieved with the metamaterial-inspired antenna as 146.91% and 3183.05, respectively. The operating frequency of this antenna sensor covers the bandwidth of 17 GHz, starting from 3 to 20 GHz with a realized gain of 3.88 dB. The proposed HSRR-based ultrawideband antenna sensor is found to reach high gain and bandwidth while maintaining the smallest electrical size, a highly desired property for pH-sensing applications.

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