Transversal Asymmetry in Periodic Leaky-Wave Antennas for Bloch Impedance and Radiation Efficiency Equalization Through Broadside

Otto, S.; Al-Bassam, Amar; Rennings, Andreas; Solbach, Klaus; Caloz, Christophe

doi:10.1109/tap.2014.2343621

Cited by 132 publications

(91 citation statements)

References 26 publications

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“…Performance degradations in the scattering parameters and radiation are observed around the transition frequency. Further improvement may require imposing extra conditions on the radiation efficiencies [11] besides (4). An inconsistency of approximately 2 dB between the measured and simulated gains is observed.…”

Section: Leaky-wave Antennamentioning

confidence: 99%

Differential-Type CRLH Leaky-Wave Antenna Using Stepped Impedance Resonators

Kushiyama

Arima

Uno

2016

Antennas Wirel. Propag. Lett.

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A composite right/left-handed (CRLH) leaky-wave antenna (LWA) using a stepped impedance resonator (SIR) is presented. By applying the SIR technique to a conventional CRLH structure, a balanced condition is achieved through the adjustment of the SIR parameters. Therefore, the structure requires no interdigital or multilayered capacitor to achieve the balanced condition. A differential microstrip configuration is also used for the utilization of a virtual ground to eliminate the need for ground vias. The simplicity of the structure allows for applications at high frequencies. An LWA consisting of 14 unit cells of the proposed structure is designed and measured. Continuous beam scanning from the backward direction to the forward direction is demonstrated.Index Terms-Leaky-wave antenna (LWA), composite right/left-handed (CRLH) transmission line (TL), stepped impedance resonator (SIR).

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Section: Leaky-wave Antennamentioning

confidence: 99%

Differential-Type CRLH Leaky-Wave Antenna Using Stepped Impedance Resonators

Kushiyama

Arima

Uno

2016

Antennas Wirel. Propag. Lett.

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“…Therefore, one has to resort to Fig. 1, where this coupling is modeled by four ideal transformers with transformation ratio T [15].…”

Section: Appendix a Bloch Impedance Derivation And Analaysismentioning

confidence: 99%

Broadside Dual-Channel Orthogonal-Polarization Radiation Using a Double-Asymmetric Periodic Leaky-Wave Antenna

Al-Bassam¹,

Otto²,

Heberling³

et al. 2017

IEEE Trans. Antennas Propagat.

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Abstract-The paper demonstrates that double unit-cell asymmetry in periodic leaky-wave antennas (P-LWAs), i.e. asymmetry with respect to both the longitudinal and transversal axes of the structure -or longitudinal asymmetry (LA) and transversal asymmetry (TA) -allows for the simultaneous broadside radiation of two orthogonal modes excited at the two ports of the antenna. This means that the antenna may simultaneously support two orthogonal channels, which represents an interesting polarization diversity characteristics for wireless communications. The double asymmetric (DA) unit cell combines a circularly polarized LA unit cell and a coupled mode TA unit cell, where the former provides equal radiation in the series and shunt modes while the latter separates these two modes in terms of their excitation ports. It is also shown that the degree of TA in the DA unit cell controls the cross-polarization discrimination level. The DA P-LWA concept is illustrated by two examples, a series-fed line-connected patch (SF-LCP) P-LWA and a seriesfed capacitively-coupled patch (SF-CCP) P-LWA, via full-wave simulation and also experiment for the SF-LCP P-LWA case.

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“…For examples, metamaterials have nanostructured media with hyperbolic dispersion for practical applications from subwavelength resolution imaging in the near and far field [1][2][3][4][5], negative refraction [6][7][8], invisibility devices [9] and perfect absorbers [10], to nonlinear switching [11]. Metamaterials with microscopic structures are also proposed for applications of the transmission line and microwave [12] such as the ultra wideband antenna [13][14][15][16][17][18], the leaky-wave antenna [19,20], the resonator [21], the dual-band RFID antenna [22], the coupled-line phaser [23], the magnetless nonreciprocal gyroscopic metasurface [24]. Furthermore, metamaterials are used for an acoustic transformation media [25], or a two-layered isotropic thermal media [26] in a manner not observed in the bulk materials.…”

Section: Introductionmentioning

confidence: 99%

Transformation Optical User-Friendly Interface for Designing Metamaterials

Pijitrojana¹,

Jarutatsanangkoon²

2019

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Transformation optics offers a procedure to design the structures of metamaterials to find the material parameters needed in various applications. However, a methodology of a transformation optics is too complicated. To help users who are beginning to study metamaterials and transformation optics, a transformation optical userfriendly interface is developed. The interface is implemented based on the free-form touch transformation. It displays the starting space as a Cartesian grid. As the user touches and moves, the space transforms according to the direction and the intensity of the touch without inputting any equations. By combining various transformation templates, a fully arbitrary transformation can be realized. Transformation templates are created by basic functions such as the ring transformation in the invisibility cloak or the morphing of a half circle into a rectangle in the superlens. The interface provides both the input methods as well as the real-time visualization of the space making it easy and intuitive to design a metamaterial using the transformation optics. The program uses model-view-controller architecture. The connections of each class are presented in a diagram. Three examples from the touch interface are verified by the FDFD simulation.

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Transversal Asymmetry in Periodic Leaky-Wave Antennas for Bloch Impedance and Radiation Efficiency Equalization Through Broadside

Cited by 132 publications

References 26 publications

Differential-Type CRLH Leaky-Wave Antenna Using Stepped Impedance Resonators

Differential-Type CRLH Leaky-Wave Antenna Using Stepped Impedance Resonators

Broadside Dual-Channel Orthogonal-Polarization Radiation Using a Double-Asymmetric Periodic Leaky-Wave Antenna

Transformation Optical User-Friendly Interface for Designing Metamaterials

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