Evanescent and propagating modes of dielectric-loaded circular waveguide

Clarricoats, P.J.B.; Taylor, Bronagh

doi:10.1049/piee.1964.0320

Cited by 56 publications

(25 citation statements)

References 2 publications

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“…To conform to the parameters used in [45], the radius a of the spheres was chosen to be 5 nanometers and the spheres were embedded in glass with a dielectric constant equal to 2.56 (k = 1.6 × ω/c [32][33][34] show that much of the kd-βd curves of all the traveling waves exist in fairly narrow frequency bands and over much of each of these narrow frequency bands βd kd. This implies that these plasmonic traveling waves, as expected, can have most of their power confined to within a small fraction of a free-space wavelength from the spheres.…”

Section: Silver Nanospheresmentioning

confidence: 99%

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Traveling Waves on Two- and Three-Dimensional Periodic Arrays of Lossless Acoustic Monopoles, Electric Dipoles, and Magnetodielectric Spheres

Shore¹,

Yaghjian²

2006

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Section: Silver Nanospheresmentioning

confidence: 99%

“…It should be noted that some lossless waveguides can support traveling waves with complex propagation constants. These "complex waves" must, of course, carry zero total power [33], [34], [35].…”

Section: A Bidirectionality Of Reciprocal Lossy or Lossless Uniformmentioning

confidence: 99%

Traveling Waves on Two- and Three-Dimensional Periodic Arrays of Lossless Acoustic Monopoles, Electric Dipoles, and Magnetodielectric Spheres

Shore¹,

Yaghjian²

2006

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“…Figure 5 shows the plot of the expression in Eq. (2). Table 1 summarizes the results of the radar measurements and compares them to the reference data obtained with the accelerometer installed on the structure.…”

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confidence: 99%

A robust and efficient method for obtaining the complex modes in inhomogeneously filled waveguides

Monsoriu¹,

Coves²,

Gimeno³

et al. 2003

Micro & Optical Tech Letters

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The method described above is able to separate the contributions of a set of targets, provided that vibration frequency is known. This can be adequately measured by calculating the FFT of the angle of the measured response in time, normalized with respect to the instantaneous microwave frequency. EXPERIMENTAL RESULTSThe radar technique has been tested at a facility of the Department of Civil and Environmental Engineering at the University of Perugia. The test structure was a vertical steel frame 10-m in height. A mechanical vibrodyne was positioned on the summit (Fig. 3). The CW radar was a prototype based on a network analyzer (HP 8753D) that operated as a coherent microwave transmitter and receiver, with a couple of horn antennas as described in [5]. The radar system was positioned in front of the structure, at a distance of 8 m. An accelerometer was installed on the structure at a height of 6 m.CWSF measurement was carried out both with the structure artificially shaken by the vibrodyne, and naturally stirred by a light breeze. Figure 4 shows the FFT plots of the radar angular response in time with the structure naturally stirred. CWMF measurement was carried out with the structure artificially shaken. Figure 5 shows the plot of the expression in Eq. (2). Table 1 summarizes the results of the radar measurements and compares them to the reference data obtained with the accelerometer installed on the structure.The agreement between CWSF tests and accelerometer measurements is rather qualitative. In effect, as the radar performs a global displacement measurement, the comparison with a punctual sensor is of minor significance.On the contrary, because the CWMF technique is able to separate the contribution of the structure section where the accelerometer was installed, the agreement between CWMF tests and accelerometer measurements is more satisfactory. CONCLUSIONThe non-contact remote operating microwave techniques described in this paper provided effective measurements of the dynamic response of large structures. Furthermore, it has been demonstrated that the CWSF technique is able to measure the response of vertical structures without artificial stimuli. A ROBUST AND EFFICIENT METHOD FOR OBTAINING THE COMPLEX MODES IN INHOMOGENEOUSLY FILLED WAVEGUIDES

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“…The techniques used in these works proved to be numerically efficient in many cases. However, these approaches fail when two eigenvalues are very close or the structure supports complex modes [81][82][83].…”

Section: Solving the Characteristic Equationmentioning

confidence: 99%

“…However, cylindrically layered waveguides can support solutions with k z < 0. These so-called backward-waves can appears in closed inhomogeneous waveguides [81,82], [42, pp. 684-685].…”

Section: Region Of Searchmentioning

confidence: 99%

Pseudo-Analytical Modeling for Electromagnetic Well-Logging Tools in Complex Geophysical Formations

Rosa¹

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Evanescent and propagating modes of dielectric-loaded circular waveguide

Cited by 56 publications

References 2 publications

Traveling Waves on Two- and Three-Dimensional Periodic Arrays of Lossless Acoustic Monopoles, Electric Dipoles, and Magnetodielectric Spheres

Traveling Waves on Two- and Three-Dimensional Periodic Arrays of Lossless Acoustic Monopoles, Electric Dipoles, and Magnetodielectric Spheres

A robust and efficient method for obtaining the complex modes in inhomogeneously filled waveguides

Pseudo-Analytical Modeling for Electromagnetic Well-Logging Tools in Complex Geophysical Formations

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