Electromagnetic modeling and optimization of spatial power combiners/dividers with hard horns

Ozkar, M.; Mortazawi, Amir

doi:10.1109/tap.2004.840539

Cited by 10 publications

(2 citation statements)

References 23 publications

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“…TEM waveguides have been traditionally obtained using dielectric substrates on the sidewalls of standard metal waveguides. These waveguides, also known as hard waveguides, have been used as radiating structures in phased arrays [81], as feeding structures for planar slot arrays [82], and applied to hard horns for power amplifiers [83], [84]. Higher permittivity values provides better performance at a expense of a reduction of bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Method for measuring waveguide propagation losses by means of a Mach–Zehnder Interferometer structure

Gutiérrez

Brimont

Aamer

et al. 2012

Optics Communications

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A mi familia. PrefaceThis work was initiated in 2005 with the objective of studying a new proposal for low-cost high-gain planar antennas for millimeter-wave applications. This proposal, the so-called Single Hard Wall Waveguide (SHWW), is based on the use of soft/hard surfaces within oversized rectangular waveguides to feed planar slot arrays. The research has been developed in the Electromagnetic Radiation Group, headed by Prof. Miguel Ferrando Bataller, at the iTeAM Institute of the Universidad Politécnica de Valencia (UPV), and supervised by Prof. Alejandro Valero Nogueira. This work has been supported in part by the Universidad Politécnica de Valencia under a 4-year PhD grant (the FPI-UPV program), and by the Spanish Ministerio de Ciencia e Innovacion under projects TEC2007-66698-C04-03 and PTA2008-0892-P.The need of a deeper understanding of the soft/hard surface concept led me to visit Prof. Kildal's group at Department of Signals and Systems at Chalmers University of Technology, during 3 months the Autumn 2007. Prof. Per-Simon Kildal established the definition of soft/hard surfaces in 1989. And since then, he has done many contributions to the study and application of these surfaces. This visit not only meant a encouragement to our research, but also inspired the invention of a new gap waveguide by Prof. Kildal. This waveguide has a large application potential, in particular to the realization of circuits and components at the millimeter-wave band. The first studies on this waveguide were carried out during a second visit to Kildal's group during 3 months the Autumn 2008. Further works on the study and development of this new technology were later done in Valencia. Gap waveguides are now being investigated in several research groups (UPV, Chalmers, Siena, Zagreb, Mississippi). Agradecimientos -AcknowledgmentsSois muchas las personas que a lo largo de estos años habéis estado conmigo, y que de una u otra forma, aún sin ser conscientes de ello, habéis contribuido a la realización de esta tesis. A todos vosotros os la quiero dedicar.Quiero transmitiros mi más sincera gratitud, porque sin vosotros no habría encontrado la fuerza, la calma y la ilusión necesarias para llegar hasta aquí. No es mi intención nombraros directamente, pues estoy segura de que de sobra sabéis lo importantes que habéis sido para mí cada uno de vosotros, tan solo lo haré cuando no pueda evitarlo. Os llevo en mi recuerdo y en mi corazón, y os voy a estar por siempre agradecida, a todos.Me gustaría empezar por mi tutor. Gracias Alejandro, por darme la oportunidad de emprender este camino. Gracias por acompañarme en todo momento, por guiarme, y confiar en mí. Gracias por tu ayuda, tu apoyo, paciencia y dedicación.Gracias José Ignacio, por ordenar mis pensamientos tantas veces, por todo lo que he podido aprender contigo. Gracias por tu inestimable ayuda, interés y seguimiento de este trabajo. Gracias por tu continuo apoyo y absoluta disposición. Ojalá puedas ayudar a otros tanto como a mí.Gracias Mariano, por la ayuda prestada. Gracias por ...

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Section: Introductionmentioning

confidence: 99%

Method for measuring waveguide propagation losses by means of a Mach–Zehnder Interferometer structure

Gutiérrez

Brimont

Aamer

et al. 2012

Optics Communications

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“…each cell receiving, amplifying, and then radiating a signal into free space [13]- [15]. The key challenges of spatial power combining design are the modeling of receive/transmit antenna elements and the uniform excitation of the antenna arrays.…”

Section: Introductionmentioning

confidence: 99%

FDTD Analysis of a Probe-Fed Dielectric Resonator Antenna in Rectangular Waveguide

Zhang

Kishk

Yakovlev

et al.

IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.

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Dielectric resonator antennas (DRA) are characterized for operation in a guided-wave environment with the ultimate goal of their use in modeling of waveguide-based DRA amplifier arrays for spatial power combining. Performance of a single probe-fed DRA element in rectangular waveguide is analyzed by varying design parameters of the DRA and the feeding probe to optimize the structure for the scattering characteristics (port matching and coupling). The effect of hard walls on the DRA behavior is also studied. The numerical analysis of waveguide-based DRA elements is based on the Finite-Difference Time-Domain (FDTD) method and a coaxial probe is modeled by a thin wire approximation implemented in the FDTD algorithm. The numerical results are compared with those generated by using commercial software and exhibit a very good agreement.

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Dielectric resonator probe arrays with sectoral hard horn for wideband spatial power combiners/dividers

Zhang

Kishk

Yakovlev

et al. 2007

IET Microw. Antennas Propag.

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Analysis of dielectric resonator probe (DRP) arrays operating in an oversized hard waveguide with sectoral hard horn excitation is presented. A single DRP excited by a coaxial probe is first investigated inside a hollow rectangular waveguide and a waveguide loaded with hard walls, respectively. Simulation results are compared with measurement results and show a good agreement. Then, a one-dimensional DRP array is analysed inside a dielectric-loaded, oversized waveguide with sectoral hard horn excitation. A full-wave analysis based on the region-by-region finite-difference time-domain technique is applied for the optimisation of array parameters such as inter-element coupling, active reflection coefficients and uniform excitation. Numerical results are compared with those generated by using commercial software and exhibit a very good agreement.

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Electromagnetic modeling and optimization of spatial power combiners/dividers with hard horns

Cited by 10 publications

References 23 publications

Method for measuring waveguide propagation losses by means of a Mach–Zehnder Interferometer structure

Method for measuring waveguide propagation losses by means of a Mach–Zehnder Interferometer structure

FDTD Analysis of a Probe-Fed Dielectric Resonator Antenna in Rectangular Waveguide

Dielectric resonator probe arrays with sectoral hard horn for wideband spatial power combiners/dividers

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