Approximation Technique for Dielectric Loaded Waveguides

Hord, W.E.; Rosenbaum, F.J.

doi:10.1109/tmtt.1968.1126655

Cited by 27 publications

(4 citation statements)

References 9 publications

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“…S21 (MEASURED) S11 (THEORY) 9 9.25 9.5 9.15 10 10.25 10.5 FREQUENCY (GHz) Figure 14. Variation in the theoretical and experimental modulus of S,, and S,, parameters as a function of the frequency, for the same structure as in Figure 13…”

Section: Modulus (Db)mentioning

confidence: 99%

Numerical analysis of discontinuities in a rectangular waveguide loaded with isotropic or anisotropic obstacles by means of the coupled‐mode method and the mode‐matching method

Solano

Vegas

Prieto

1994

Int J Numerical Modelling

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SUMMARYA hybrid method obtained as a combination of the coupled-mode method (CMM) and the mode-matching method (MMM) is developed and applied in the analysis of multiple dielectric and magnetic discontinuities in rectangular waveguides. As both are moment methods, some kind of truncation has to be carried out in the computer implementation. It is shown that selection of a different number of modes in the two methods is not necessary, unless low-permittivity media inside the waveguide are considered. As a consequence, the procedure for selecting the number of basis functions is only done in one of the methods. Numerical examples are presented showing the behaviour of the method and the proofs of convergence. Examples are included illustrating the power of this hybrid technique, especially in relation to non-reciprocal structures containing magnetized ferrites.

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Section: Modulus (Db)mentioning

confidence: 99%

Numerical analysis of discontinuities in a rectangular waveguide loaded with isotropic or anisotropic obstacles by means of the coupled‐mode method and the mode‐matching method

Solano

Vegas

Prieto

1994

Int J Numerical Modelling

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“…The cutoff characteristics and the modal distributions differ significantly from that of homogeneously filled rectangular waveguides. The cutoff characteristics of inhomogeneous rectangular waveguides partially filled with one right-handed material (RHM) slab [4][5][6][7][8][9][10][11] or two RHM slabs, [12][13][14][15][16] dividing the waveguides into three or five regions, have been systematically and comprehensively investigated. A partially filled rectangular waveguide supports two kinds of hybrid modes: (a) the longitudinal section electric (LSE) mode, for which has no component of the electric field normal to the interfaces; (b) the longitudinal section magnetic (LSM) mode, for which has no component of the magnetic field normal to the interface.…”

Section: Introductionmentioning

confidence: 99%

Computational analysis of cutoff wavenumbers in rectangular waveguides filled with left‐handed material and/or right‐handed material

Weng

2019

Int J RF Microw Comput Aided Eng

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This paper investigates the cutoff wavenumbers and their geometric and dielectric dependence in rectangular waveguides filled with left-handed material (LHM) and/or right-handed material (RHM). A rigorous hybrid mode analysis of these structures produces the dispersion equations and the formulations of cutoff wavenumbers for the first three modes. It is shown how the geometric and dielectric parameters may influence the cutoff wavenumbers of the waveguides filled with LHM and/or RHM. The graphs of cutoff wavenumbers over a range of geometric and dielectric parameters sufficiently wide to cover most requirements of design and application have been plotted. The cutoff wavenumbers of waveguides with LHM increase as the thicknesses or the absolute values of permittivity of LHM increase. It is noted that the variation rules of cutoff wavenumbers in waveguides with LHM show different changing tendencies compared with the waveguides with RHM. K E Y W O R D S cutoff wavenumbers, dispersion equations, left-handed material, metamaterials, rectangular waveguides

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“…Design considerations: The phase shifter based on a partially loaded waveguide is well known [6,7]. The insertion of a dielectric into the waveguide as shown in Fig.…”

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Substrate‐integrated waveguide phase shifter with rod‐loaded artificial dielectric slab

Djerafi

Tatu

2015

Electron. lett.

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A substrate-integrated waveguide (SIW) broadband phase shifter is presented and studied. The phase shift mechanism is based on the synthesis of an artificial dielectric slab using an array of metallic rods in the middle of a SIW. This technique enables a large phase shift within a compact size and enhances the density of integration. As an example, 45°and 90°phase shifters are designed and showcased on a single-layer substrate at a centre frequency of 26 GHz. The amplitude imbalance between the two paths is also avoided while the phase error is less than 5°over a frequency band of 20-32 GHz or around 46% relative bandwidth. The measured return loss is found to be better than 12 dB over the whole frequency band.Introduction: Phase shifters in fixed and variable categories are extremely desired components [1,2]. They are used in a wide variety of applications including wireless communication, radar, measurement and instrumentation systems, as well as antenna array feed and beamforming networks. The use of substrate-integrated waveguide (SIW) technology allows the development of a compact circuit with low radiation loss at millimetre-wave frequencies. Several SIW phase shifters have been proposed and demonstrated [3][4][5].In [3], the phase shifting was realised by means of unequal length, unequal width transmission lines. A differential phase shift of 45 ± 0.4°was achieved together with a reflection coefficient of less than −20 dB over 31-40 GHz (25%) and an insertion loss of <0.7 dB. On the other hand, a SIW phase shifter was developed by H-plane stubs loading in [4] to cover the V-band, with a flat phase difference of 90°over 16% of the frequency band. In such two cases, the main and reference lines have different lengths that may complicate the integration of the phase shifter in a whole network.In [5], the phase-shift mechanism was studied on the basis of the synthesis of a low dielectric slab in the middle of a SIW using an array of air holes (air-field slab). The number of holes, their diameter and their spacing can be adjusted to yield the required phase shift. An experimental validation in the Ka band shows excellent results from 30 to 40 GHz.The last design solution shows a restricted flexibility; in fact, the slab has one possible permittivity (air-field). To achieve a greater phase shifting, unit cells should be cascaded to generate an additive phase shift. Of course, the total size as well as the insertion loss would be increased. The phase shifter using a lower permittivity slab requires a larger dimension compared with its high-permittivity counterpart. It is rather complicated to integrate slabs of different materials in a SIW without altering its shielding propriety. Therefore, the use of an artificial material is proposed in this Letter to allow for permittivity variation.In this Letter, the design platform of the proposed SIW phase shifter is presented and discussed. An array of metallic rods is inserted to increase artificially the dielectric permittivity in the waveguide centre.Parameters are fi...

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Approximation Technique for Dielectric Loaded Waveguides

Cited by 27 publications

References 9 publications

Numerical analysis of discontinuities in a rectangular waveguide loaded with isotropic or anisotropic obstacles by means of the coupled‐mode method and the mode‐matching method

Numerical analysis of discontinuities in a rectangular waveguide loaded with isotropic or anisotropic obstacles by means of the coupled‐mode method and the mode‐matching method

Computational analysis of cutoff wavenumbers in rectangular waveguides filled with left‐handed material and/or right‐handed material

Substrate‐integrated waveguide phase shifter with rod‐loaded artificial dielectric slab

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