Solution of Waveguide Discontinuities by Modal Analysis

Wexler, A.

doi:10.1109/tmtt.1967.1126521

Cited by 371 publications

(186 citation statements)

References 3 publications

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“…Mode matching method [16][17][18][19][20] has been widely used to efficiently solve waveguide discontinuity problems. For the parallel plate discontinuous waveguides, usually there are two types of discontinuities, as shown in Fig.…”

Section: Uniform Microstrip Line Metamaterials Absorbermentioning

confidence: 99%

“…5, are different. With the absorption strength taken into account, the fitness function can be expressed as follows: fitness = Bandwidth + weight × Area 1, (Bandwidth > 0) (16) where weight is a small number such that the returned value of the fitness function is mostly dependent on the bandwidth. The fitness function defined in (16) is valid as long as the bandwidth is larger than zero.…”

Section: Optimization Of the Metamaterials Absorber By Using The Genetmentioning

confidence: 99%

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Analysis and Design of an Ultra-Thin Metamaterial Absorber

Huang¹,

Li²,

Kong³

et al. 2009

PIER B

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Abstract-This paper presents a class of ultra-thin metamaterial absorbers, which consists of periodic microstrip lines on top of a planar lossy substrate backed by a conducting metallic plate. A highly efficient full-wave analysis method was developed to solve the electromagnetic response of the absorbers. The influence of electromagnetic properties of the substrate and physical dimensions of the microstrip lines were analyzed. Genetic algorithm was used to optimize the absorption bandwidth of the absorbers. Effective permeability and permittivity of the absorbers were retrieved to shed a new light on the absorption mechanism of the absorbers and to explain their ultimate bandwidth limit. It was found that the ultimate bandwidth limit of the metamaterial absorbers is the same as that of normal absorbers.

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Section: Uniform Microstrip Line Metamaterials Absorbermentioning

confidence: 99%

Section: Optimization Of the Metamaterials Absorber By Using The Genetmentioning

confidence: 99%

Analysis and Design of an Ultra-Thin Metamaterial Absorber

Huang¹,

Li²,

Kong³

et al. 2009

PIER B

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“…using mode-matching theory [3]. A waveguide mode is defined as an eigenvalue/eigenfunction combination of…”

Section: The Equivalent Impedance Structure Approachmentioning

confidence: 99%

Design of a Broadband Transition Using the Constant Impedance Structure Approach

Murk

2009

PIER Letters

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Abstract-Transitions from circular waveguides to rectangular waveguides are used in many situations. One particular case is between the feed of a circular corrugated horn antenna and following rectangular waveguide structures. Since the field patterns are not the same on both sides the conversion from rectangular to circular waveguide always results in a certain amount of power reflected back in one waveguide. Much effort has been put in designing special converters which reduce this effect. For many designs, reflection is reduced by introducing a certain number of waveguide steps. By adjusting the distance between these steps, one can get destructive interference of the returned signal at specific frequencies. In this paper, an alternative approach, the constant impedance structure (CIS) has been chosen. This eliminates the need to design a waveguide converter for minimum return loss at discrete frequencies. The transition obtained by this approach is compared to a transition based on linear surface interpolation.

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“…The modal methods such as the Mode Matching (MM) technique [1], the Generalized Scattering Matrix (GSM) analysis [2] and the Multimodal Variational Method (MVM) [3], use a modal development of electromagnetic fields on the basis of eigenmodes of constituent waveguides.…”

Section: Introductionmentioning

confidence: 99%

Complex Rectangular Filter Design Using Hybrid Finite Element Method and Modified Multimodal Variational Formulation

Yahia¹,

Tao²,

Sakli³

2013

PIER C

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Abstract-We hybridize vector Finite Element Method (FEM) and a Modified Multimodal Variational Formulation (MMVF) to the accurate and fast design of complex isotropic rectangular filters. The MMVF is applied to the full-wave description in the rectangular waveguides while the FEM characterizes waves in the arbitrarily shaped discontinuities. The proposed hybrid method is applied to the full-wave analysis of circuits with great practical interest (i.e., cross-shaped iris and multimode filters), thus improving CPU time and memory storage against several full-wave FEM based Computer Aided Design (CAD) tools (i.e., HFSS High Frequency Structural Simulator). The performances of the proposed hybrid method are validated with experimental results and HFSS simulations.

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Solution of Waveguide Discontinuities by Modal Analysis

Cited by 371 publications

References 3 publications

Analysis and Design of an Ultra-Thin Metamaterial Absorber

Analysis and Design of an Ultra-Thin Metamaterial Absorber

Design of a Broadband Transition Using the Constant Impedance Structure Approach

Complex Rectangular Filter Design Using Hybrid Finite Element Method and Modified Multimodal Variational Formulation

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