Short dual‐band planar leaky‐wave antenna with broadside effect mitigation

Abdo-Sánchez, Elena; Martín-Guerrero, Teresa M.; Esteban, Jaime; Camacho‐Peñalosa, C.

doi:10.1049/iet-map.2015.0741

“…Assuming that the mode inside the waveguide is not affected much by the deviation in the permittivity of the metasurface substrate (so, θ in is the one we designed), the pointing angle will be determined by the periodicity of the structure, given by (8). Subsequently, the relation between the frequency with 19 19.5 20 20. the pointing angle is expected to be the same as in the design.…”

Section: Designs and Simulation Resultsmentioning

confidence: 99%

A Leaky-Wave Antenna With Controlled Radiation Using a Bianisotropic Huygens’ Metasurface

Abdo-Sánchez

¹

,

Chen

²

,

Epstein

³

et al. 2019

IEEE Trans. Antennas Propagat.

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In this paper, a novel concept of a leaky-wave antenna is proposed, based on the use of Huygens' metasurfaces. It consists of a parallel-plate waveguide in which the top plate is replaced by a bianisotropic metasurface of the Omega type. It is shown that there is an exact solution to transform the guided mode into a leaky-mode with arbitrary control of the constant leakage factor and the pointing direction. Although the solution turns out to be periodic, only one Floquet mode is excited and radiates, even for electrically long periods. Thanks to the intrinsic spurious Floquet mode suppression, broadside radiation can be achieved without any degradation. Simulations with idealized reactance sheets verify the concept. Moreover, physical structures compatible with PCB fabrication have been proposed and designed, considering aspects such as the effect of losses. Finally, experimental results of two prototypes are presented and discussed.

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“…The component values are extracted from the simulated or measured admittance parameters using the procedure specified in Section III. The addition of a suitable amount of asymmetry to these structures was already proposed in [4] and [15] to solve the problem of the open-stopband effect at broadside.…”

Section: Case Studiesmentioning

confidence: 99%

An Equivalent-Circuit Topology for Lossy Non-Symmetric Reciprocal Two-Ports

Hernández-Escobar

¹

,

Mateos-Ruíz

²

,

Esteban

³

et al. 2021

Self Cite

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An equivalent-circuit topology for two-port lossy non-symmetric reciprocal networks is proposed. The circuit topology is based on the eigenstate decomposition. The proposed circuit consists of two immittances and two transformers with a single complex turns ratio, all obtained from the eigenvalues and eigenvectors of the admittance or impedance matrix of the network in a straightforward way. The interconnection of the circuit elements is simple and compact, and the real parts of its immittances are always positive. To verify its behavior, the equivalent circuit of two different leaky-wave antenna unit cells is extracted: a series-fed coupled patch radiating element, and the complementary strip-slot. Simulated and measured data are provided for the study cases, highlighting the satisfactory behavior of the equivalent circuit over a very broad bandwidth. A simple asymmetry model is also proposed that can be used advantageously in the analysis and design of non-symmetric two-ports, like unit cells of leaky-wave antennas.

show abstract

“…The component values are extracted from the simulated or measured admittance parameters using the procedure specified in Section III. The addition of a suitable amount of asymmetry to these structures was already proposed in [2] and [14] to solve the problem of the open-stopband effect at broadside.…”

Section: Case Studiesmentioning

confidence: 99%

“…A consequence of the eigenstate separation property of the proposed equivalent circuit is that it can separate the contribution of these two modes and, thus, the contribution of the slot and stub, even if some asymmetry is added. This introduction of asymmetry to the structure was proposed in [14] to reduce the broadside open-stopband effect when building an LWA with this element.…”

Section: B Complementary Strip-slotmentioning

confidence: 99%

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An Equivalent-Circuit Topology for Lossy Non-Symmetric Reciprocal Two-Ports

Hernández-Escobar¹,

Abdo-Sánchez²,

Mateos-Ruíz³

et al. 2021

Preprint

Self Cite

0

View full text Add to dashboard Cite

An equivalent-circuit topology for two-port lossy non-symmetric reciprocal networks is proposed. The circuit topology is based on the eigenstate decomposition. The proposed circuit consists of two immittances and two transformers with a single complex turns ratio, all obtained from the eigenvalues and eigenvectors of the admittance or impedance matrix of the network in a straightforward way. The interconnection of the circuit elements is simple and compact, and the real parts of its immittances are always positive. To verify its behavior, the equivalent circuit of two different leaky-wave antenna unit cells is extracted: a series-fed coupled patch radiating element, and the complementary strip-slot. Simulated and measured data are provided for the study cases, highlighting the satisfactory behavior of the equivalent circuit over a very broad bandwidth. A simple asymmetry model is also proposed that can be used advantageously in the analysis and design of non-symmetric two-ports, like unit cells of leaky-wave antennas.

show abstract

Short dual‐band planar leaky‐wave antenna with broadside effect mitigation

Cited by 13 publications

References 10 publications

A Leaky-Wave Antenna With Controlled Radiation Using a Bianisotropic Huygens’ Metasurface

A Leaky-Wave Antenna With Controlled Radiation Using a Bianisotropic Huygens’ Metasurface

An Equivalent-Circuit Topology for Lossy Non-Symmetric Reciprocal Two-Ports

An Equivalent-Circuit Topology for Lossy Non-Symmetric Reciprocal Two-Ports

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