Study of radiating properties of open-ended rectangular waveguides

Baudrand, H.; Tao, Junwu; Atechian, J.

doi:10.1109/8.7219

Cited by 57 publications

(25 citation statements)

References 9 publications

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“…Then, the measured S 11a_sample was converted to normalized admittance, Y/ Y o parameter by a formula: Y/Y o =( 1− S 11a_sample )/(1 + S 11a_sample ). The SOO calibration techniques were validated by comparing normalized admittance, Y/Y o with the literature data [15][16][17][18][19][20][21][22] as shown in Figure 14. The real part, Re(Y/Y o ), and the imaginary part, Im(Y/Y o ), of admittance results were found to be in good agreement with literature data over the operational range of frequencies.…”

Section: Short-offset-offset Short (Soo) Standard Calibrationsmentioning

confidence: 99%

Materials Characterization Using Microwave Waveguide System

You¹

2017

Microwave Systems and Applications

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This chapter reviews the application and characterization of material that uses the microwave waveguide systems. For macroscopic characterization, three properties of the material are often tested: complex permittivity, complex permeability and conductivity. Based on the experimental setup and sub-principle of measurements, microwave measurement techniques can be categorized into either resonant technique or nonresonant technique. In this chapter, calibration procedures for non-resonant technique are described.The aperture of open-ended coaxial waveguide has been calibrated using Open-Short-Load procedures. On the other hand, the apertures of rectangular waveguides have been calibrated by using Short-Offset-Offset Short procedures and Through-ReflectLine calibration kits. Besides, the extraction process of complex permittivity and complex permeability of the material which use the waveguide systems is discussed. For one-port measurement, direct and inverse solutions have been utilized to derive complex permittivity and complex permeability from measured reflection coefficient. For two-port measurement, in general, the material filled in the waveguide has been conventional practice to measure the reflection coefficient and the transmission coefficient by using NicholsonRoss-Weir (NRW) routines and convert these measurements to relative permittivity, ε r and relative permeability, μ r . In addition, this chapter also presents the calculation of dielectric properties based on the difference in the phase shifts for the measured transmission coefficients between the air and the material.

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Section: Short-offset-offset Short (Soo) Standard Calibrationsmentioning

confidence: 99%

Materials Characterization Using Microwave Waveguide System

You¹

2017

Microwave Systems and Applications

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“…The correlation matrix method which is based on the energy conservation low has been applied in [14], while Teodoridis et al [15] have used the characteristic modes and the problem is solved by investigating the eigenvalues. In [16], Boudrant et al have obtained an integral equation by using the operator transverse method. This integral equation was solved using the Galerkin's method.…”

Section: Introductionmentioning

confidence: 99%

A New Approach Based on MoM-GEC Method to Mutual Coupling Analysis of Symmetric Twin Waveguides for Antenna Applications

Aidi¹,

Aguili²

2015

JEMAA

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In previous modeling works, the waveguide radiation in the free space is modeled using an infinite flange in aperture plan. In this paper, we propose a new formulation to analyze the radiation of twin rectangular waveguides in free space. Our formulation consists firstly in simulating the free space as rectangular waveguide and seeking the appropriate dimensions that do not affect scattering parameters. In the second step, we use the symmetry principle to reduce the coupling problem to single guide radiating in the free space. Moreover, for more simplification, we consider a concentric discontinuity to solve this latter. This approach is based on moments method combined to the generalized equivalent circuit method (MoM-GEC) in order to reduce the number of unknown problems and alleviate their computation. Obtained numerical results are presented and discussed. A good agreement with literature is shown and the boundary conditions are verified.

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“…Analytical approaches to the reflection coefficient or equivalently the aperture admittance of a rectangular waveguide radiating into air in the presence of an infinite flange have been studied by many researchers [9][10][11][12][13][14][15][16], where modal expansionmode matching and variational principles are among most frequentlyused techniques. These authors provide equations for the reflection coefficient or the aperture admittance of an OERW, where complicated calculations such as series summation and numerical integration are required.…”

Section: Introductionmentioning

confidence: 99%

New Formula for the Reflection Coefficient of an Open-Ended Rectangular Waveguide With or Without an Infinite Flange

Kim¹,

Enkhbayar²,

Bang³

et al. 2010

PIER M

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Abstract-New formulas are presented for the reflection coefficient at the open end of a rectangular waveguide radiating into air including the effect of wall thickness or flange. Existing formulas require significant amount of numerical calculations and do not cover the practical range of waveguide dimensions.Reflection coefficients of open-ended standard waveguides are simulated using commercial electromagnetic software and curve-fitted to derive new formulas. Proposed formulas also include the effect of the broad-to-narrow wall aspect ratio. The accuracy of proposed formulas is compared with existing analytical, numerical and experimental results.

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Study of radiating properties of open-ended rectangular waveguides

Cited by 57 publications

References 9 publications

Materials Characterization Using Microwave Waveguide System

Materials Characterization Using Microwave Waveguide System

A New Approach Based on MoM-GEC Method to Mutual Coupling Analysis of Symmetric Twin Waveguides for Antenna Applications

New Formula for the Reflection Coefficient of an Open-Ended Rectangular Waveguide With or Without an Infinite Flange

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