3D Directive Radiation from a Horizontal Dipole Embedded in a Homogenized Grounded Wire-Medium Slab

Burghignoli, Paolo; Lovat, Giampiero; Capolino, Filippo; Jackson, David R.; Wilton, Donald R.

doi:10.1109/aps.2006.1711236

Cited by 4 publications

(9 citation statements)

References 10 publications

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“…This will be the case when the permittivity is small, as will be demonstrated later in the results. These points explain why the radiation patterns in [9]- [11] have a good polarization purity.…”

Section: Electric Field At the Air-slab Interfacementioning

confidence: 79%

“…This explains why the broadside radiation from such a structure is mainly due to the leaky mode [9]- [11]. The leaky mode is very dominant because the dipole source is located inside the homogenized wire-medium (low-permittivity) slab at the optimum location (in the middle of the slab) to best excite the leaky mode, while also minimizing the space-wave field.…”

Section: B Electric Field At the Air-slab Interfacementioning

confidence: 99%

“…1, where the relevant geometrical parameters and the adopted coordinate system are also shown). Recently, certain properties of a grounded configuration of such a slab have been studied, excited by a simple electric dipole source placed inside the wire-medium and oriented parallel to the wires [9]. For frequencies slightly above the plasma frequency, where the relative permittivity is positive but small, it has been shown that the structure is capable of producing narrow-beam radiation patterns.…”

Section: Introductionmentioning

confidence: 99%

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Modal Propagation and Excitation on a Wire-Medium Slab

Burghignoli

Lovat

Capolino

et al. 2008

IEEE Trans. Microwave Theory Techn.

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Section: Electric Field At the Air-slab Interfacementioning

confidence: 79%

Section: B Electric Field At the Air-slab Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modal Propagation and Excitation on a Wire-Medium Slab

Burghignoli

Lovat

Capolino

et al. 2008

IEEE Trans. Microwave Theory Techn.

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“…For instance, a metal backed wire-medium slab excited by an electric dipole source has recently proposed as a leaky-wave antenna with enhanced broadside radiation [1]- [2]. This phenomenon was due to the Epsilon-Near-Zero (ENZ) property of the wire medium, which, in a suitable frequency range and for particular polarizations, can be characterized by an effective relative permittivity 0 < Re[ε r ] << 1.…”

Section: Introductionmentioning

confidence: 99%

Broadside radiation enhancement using a spiral resonator MNZ metamaterial substrate

Ferrer

Romeu

Gonzalez-Arbesu

et al. 2008

2008 IEEE Antennas and Propagation Society International Symposium

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The broadside power radiation enhancement has been tested for the case of a magnetic dipole in presence of an MNZ metamaterial substrate. In order to assess the theoretical estimations, a slot antenna on a ground plane has been fabricated and an AMC composed of 1 layer square spiral resonators has been used as an MNZ metamaterial slab. The radiation patterns have been measured in the anechoic chamber, achieving a gain in directivity of more than 1 dB. However, it should be taken into account that the thickness of the fabricated metamaterial slab (6 mm) is much smaller than the theoretical optimum thickness (hundreds of mm). The directivity of the antenna might be improved when increasing the number of layers of the metamaterial slab; in fact, in such a case, the leaky waves responsible of directive radiation are expected to be more significantly excited giving rise to the sought broadside power enhancement

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“…The structure is excited by a simple electric dipole source inside the wire-medium slab, oriented in the y direction. For frequencies slightly above the plasma frequency, where the relative permittivity is positive but small, it has been shown that the structure is capable of producing naffow-beam radiation patterns [2]. Depending on the frequency, the beam may be either a pencil beam at broadside, or a conical beam at a particular scan angle 60.…”

Section: Introductionmentioning

confidence: 99%

Leaky Modes on a Grounded Wire-Medium Slab

Burghignoli

Lovat

Capolino

et al. 2007

2007 IEEE/MTT-S International Microwave Symposium

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Leaky modes supported by a grounded wiremedium slab are studied here in detail for the first time. Such leaky modes are responsible for highly-directive radiation when the structure is excited by a dipole source. The analysis is carried out by means of a rigorous full-wave numerical approach based on the method-of-moments and also by using an approximate homogenized model. The use of a homogenized model that properly accounts for anisotropy and spatial dispersion leads to a remarkable and surprising result: the wavenumber of the leaky mode is independent of the azimuth angle of propagation on the surface. This result, which has not previously been observed in any other leaky-wave structure, allows for the creation of narrow conical beams that are azimuthally symmetric, as well as symmetric broadside beams. This conclusion is confirmed by the full-wave method-of-moments analysis.

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3D Directive Radiation from a Horizontal Dipole Embedded in a Homogenized Grounded Wire-Medium Slab

Cited by 4 publications

References 10 publications

Modal Propagation and Excitation on a Wire-Medium Slab

Modal Propagation and Excitation on a Wire-Medium Slab

Broadside radiation enhancement using a spiral resonator MNZ metamaterial substrate

Leaky Modes on a Grounded Wire-Medium Slab

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