IEE Journal on Microwaves, Optics and Acoustics
Volume 1, Issue 6, November 1977
Volume 1, Issue 6
November 1977
Resonances of rectangular dielectric cylinders
- Author(s): M. Verplanken and J. Van Bladel
- Source: IEE Journal on Microwaves, Optics and Acoustics, Volume 1, Issue 6, p. 185 –191
- DOI: 10.1049/ij-moa.1977.0024
- Type: Article
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Numerical data are presented for the lowest monopole, dipole and quadrupole resonant modes of a dielectric rectangular cylinder. The data consist of a few typical field plots, together with curves for the resonant wavenumber, the quality factor, the dipole moment and the quadrupole dyadic.
Scattering by cylinders in translational motion
- Author(s): D. De Zutter and J. Van Bladel
- Source: IEE Journal on Microwaves, Optics and Acoustics, Volume 1, Issue 6, p. 192 –196
- DOI: 10.1049/ij-moa.1977.0025
- Type: Article
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The Fourier spectrum of the signal scattered by cylinders in translational motion is evaluated. The incident wave is a plane wave. Both perfectly conducting and dielectric cylinders are considered. Particular attention is given to the low-frequency limit. The spectrum turns out to be continuous, and evidences two (infinite) peaks, at frequencies ωi(1 — β cos θ i)(1 ± β)-1.
Measurements of rainfall for studies of millimetric radio attenuation
- Author(s): B.N. Harden ; J.R. Norbury ; W.J.K. White
- Source: IEE Journal on Microwaves, Optics and Acoustics, Volume 1, Issue 6, p. 197 –202
- DOI: 10.1049/ij-moa.1977.0026
- Type: Article
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Point and line rates of intense convective rain, measured between 1970 and 1976, with rapid-response gauges sited mainly in SE England, are presented in forms relevant to the estimation of attenuation by rain on terrestrial millimetric radio links; e.g. annual probability distributions of point rates for a range of gauge integration times, distributions of the duration and return periods of specific point rates and relationships between line and point rates. Statistical models have been deduced for the temporal and spatial variations and the frequency of occurrence of intense rain events in the UK and comparisons have been made with estimated long-term average values and models from other records. The models are being used to assist the development of prediction procedures for network planning.
Asymptotic evaluation of the normalised cut-off frequencies of an optical waveguide with quadratic index variation
- Author(s): J.M. Arnold
- Source: IEE Journal on Microwaves, Optics and Acoustics, Volume 1, Issue 6, p. 203 –208
- DOI: 10.1049/ij-moa.1977.0027
- Type: Article
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Asymptotic expressions for normalised cut-off frequencies of modes having large meridional order n and small azimuthal order m are obtained for an inhomogeneous waveguide having quadratic index variation. A fractional integral technique is used to construct solutions directly from the differential equation in the form of an integral representation, which is expanded by the steepest-descent procedure.
Erratum: Transmission-line matrix analysis of continuous waveguiding Structures using Stepped-impedance cavities
- Source: IEE Journal on Microwaves, Optics and Acoustics, Volume 1, Issue 6, page: 208 –208
- DOI: 10.1049/ij-moa.1977.0028
- Type: Article
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Design of microstrip spur-line band-stop filters
- Author(s): R.N. Bates
- Source: IEE Journal on Microwaves, Optics and Acoustics, Volume 1, Issue 6, p. 209 –214
- DOI: 10.1049/ij-moa.1977.0029
- Type: Article
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The paper describes the design of a new class of microstrip bandstop filter. This filter is a very compact structure, it radiates power significantly less than conventional shunt-stub and coupled-line filters and is also less susceptible to the influence of other components and lines in its vicinity.
TE and TM mode analysis of planar ion-exchanged waveguides
- Author(s): J.G. Gallagher and R.M. De La Rue
- Source: IEE Journal on Microwaves, Optics and Acoustics, Volume 1, Issue 6, p. 215 –219
- DOI: 10.1049/ij-moa.1977.0030
- Type: Article
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The WKB technique has been used to analyse the measured TE and TM mode spectra of planar optical waveguides produced by silver ion-exchange at 215° C in an unstirred melt of silver nitrate for fabrication times ranging from 7 min up to 540 min. The effects of slight variations in the fabrication temperature on the repeatability of the process have been investigated. It has been shown that control over the temperature should be within ±0.5°C of the set point in order to maintain reproducible mode-spectra measurements. A Gaussian refractive index profile, where the maximum index value occurs at some depth below the surface of the guiding region, was found to adequately describe the observed mode spectra. Evidence for the existence of ‘buried’ modes is presented, based on close examination of the m-line structure. Comparison with results predicted by a monotonically decreasing linear refractive-index profile is given.
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