ENZ-based shortened horn antenna - an experimental study

Hrabar, Silvio; Bonefačić, Davor; Muha, Damir

doi:10.1109/aps.2008.4619853

Cited by 17 publications

(11 citation statements)

References 5 publications

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“…Starting from the theoretical study of the spatial filtering properties of an epsilon-near-zero (ENZ) slab [3], shortened horn antennas with a wire medium on the aperture acting as an ENZ metamaterial have been proposed in [4]- [6]. However, such solutions turn out to be quite narrowband due to the intrinsic dispersion of the ENZ metamaterial and, thus, the gain of the antenna was actually restored for a narrow frequency range with respect the mono-modal frequency range of the original antenna.…”

Section: Introductionmentioning

confidence: 99%

Conical horn antennas with enhanced functionalities through the use of metamaterial concepts

Barbuto

Ramaccia

Trotta

et al. 2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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In this contribution, we report the results obtained by our group concerning the use of different metamaterial concepts to enhance performances and functionalities of conical horn antennas. First, we present an annular metamaterial lens to be placed on the aperture of a truncated horn antenna. The lens, consisting of an epsilon-near-zero metamaterial, is properly designed in order to compensate the phase delay of the field propagating along the short flare of the horn with respect to the one propagating along the axis. The phase compensation obtained through the lens results in a uniform phase distribution on the aperture that allows achieving the performances of an optimum antenna over the entire mono-modal frequency band. Then, we show a compact and planar component consisting of a metamaterial-inspired inclusion milled in a metallic screen and placed between the waveguide and the conical horn. At its operating frequencies the proposed inclusion allows transforming the linearly polarized field propagating along the waveguide into a circular one radiated by the conical horn. Moreover, due to its intrinsic narrow operation band, the proposed component acts as a compact filtering module able to reduce the out-of-band noise contribution and, thus, increase the signal-to-noise ratio of the antenna receiving system

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Section: Introductionmentioning

confidence: 99%

Conical horn antennas with enhanced functionalities through the use of metamaterial concepts

Barbuto

Ramaccia

Trotta

et al. 2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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“…However, ZRI is realized lately to the microwave frequencies by scaling its dimensions toward practical wireless applications [14]. Currently, different categories of the ZRI structures are utilized in the antenna applications such as Electromagnetic Band Gap (EBG), Photonic Band Gap (PBG) structures and Frequency Selective Surface (FSS) [15][16][17][18]. The ZRI structures suffer from several inherent limitations such as narrow bandwidth at which both permittivity and permeability simultaneously are near zero, high ohmic and radiation losses, and their profile is bulky and adds an extra dimension to the antenna structure [19].…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized Lotus Shaped Microstrip Antenna Loaded With Ebg Structures for High Gain-Bandwidth Product Applications

Elwi¹,

Imran²,

Alnaiemy³

2015

PIER C

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Abstract-In this paper, the design of a printed circuit antenna based on lotus flower patch of a miniaturized profile is proposed. The antenna consists of three layers including a patch and a ground plane of a thin copper layer separated by a Roger RT/duroid R 5880 substrate for high gain-bandwidth product applications including microwave imaging systems. The patch structure is patterned with triangular defects to provide a fractal structure. Nevertheless, the ground plane is defected with Electromagnetic Band Gap (EBG) structures. The antenna is found to show a first resonant mode around 3 GHz, while the other frequency modes are obtained around 4.2 GHz and 6 GHz which are below −10 dB. Moreover, the antenna operates over the frequency range from 7.8 GHz up to 15 GHz with a bore-sight gain varing from 4 dBi up to 6 dBi when operates in free-space environments. The antenna size is reduced to a 32 mm × 28 mm × 0.5 mm using shorting plates on the substrate edges. The antenna performance characteristics are examined using CST and HFSS commercial software packages, which are based on the Finite Integration Technique (FIT) and the Finite Element Method (FEM), respectively. Finally, the antenna performance is tested experimentally for both S 11 spectrum and radiation patterns to show an excellent matching with the obtained numerical results.

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“…In 2002, Enoch et al pointed out that zero index metamaterials (ZIMs) can be used to achieve directive emission on antenna systems [9], and later, Ziolkowski researched the characteristic of the propagation and scattering of electromagnetic (EM) wave in ZIM [10]. Based on the research of Enoch et al and many groups soon designed varieties of zero index metamaterial lenses (ZIMLs) and lens antennas [11][12][13][14][15][16][17][18]. However, most existing ZIMLs are implemented either by single electrical resonators [9,11,12,14,19] with near zero permittivity or by single magnetic resonators [16] with near zero permeability.…”

Section: Introductionmentioning

confidence: 99%

“…In these cases, the wave impedance of the ZIMs is not able to match that of air, which significantly lowers the radiation efficiency of antennas. As a result, these ZIMLs have to be embedded in apertures of horn antennas [11,14], or function with reflection apparatus (such as the ground plane of the patch antenna [13,15,19,20]) similarly to Fabry-Pérot resonance [21][22][23], or enclose the whole structure of antennas [9,16]. Obviously, such ZIMLs rely heavily on the practical application environment, and thus their further development is obstructed.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the research of Enoch et al and many groups soon designed varieties of zero index metamaterial lenses (ZIMLs) and lens antennas [11][12][13][14][15][16][17][18]. However, most existing ZIMLs are implemented either by single electrical resonators [9,11,12,14,19] with near zero permittivity or by single magnetic resonators [16] with near zero permeability. In these cases, the wave impedance of the ZIMs is not able to match that of air, which significantly lowers the radiation efficiency of antennas.…”

Section: Introductionmentioning

confidence: 99%

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A Detached Zero Index Metamaterial Lens for Antenna Gain Enhancement

Meng¹,

Li²,

Zhang³

et al. 2012

PIER

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Abstract-In this paper, a detached zero index metamaterial lens (ZIML) consisting of metal strips and modified split ring resonators (MSRRs) is proposed for antenna gain enhancement. The effective permittivity and permeability of the detached ZIML are designed to synchronously approach zero, which leads the ZIML to having an effective wave impedance matching with air and near-zero index simultaneously. As a result, neither does the detached ZIML need to be embedded in horns aperture nor depends on auxiliary reflectors in enhancing antenna gain, which is quite different from conventional ZIMLs. Moreover, the distance between antenna and the detached ZIML slightly affect the gain enhancement, which further confirms that the ZIML can be detached from antennas. Simulated results show that the effective refractive index of the detached ZIML is near zero in a broad frequency range where the effective relative wave impedance is close to 1. The detached ZIML is fabricated and tested by placing it in front of an H-plane horn antenna. One finds that evident gain enhancement is obtained from 8.9 GHz to 10.8 GHz and the greatest gain enhancement reaches up to 4.02 dB. In addition, the detached ZIML can also work well at other frequencies by adjusting its geometric parameters to scale, which is demonstrated by designing and simulating two detached ZIMLs with center frequencies of 2.4 GHz and 5.8 GHz, respectively.

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ENZ-based shortened horn antenna - an experimental study

Cited by 17 publications

References 5 publications

Conical horn antennas with enhanced functionalities through the use of metamaterial concepts

Conical horn antennas with enhanced functionalities through the use of metamaterial concepts

A Miniaturized Lotus Shaped Microstrip Antenna Loaded With Ebg Structures for High Gain-Bandwidth Product Applications

A Detached Zero Index Metamaterial Lens for Antenna Gain Enhancement

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