An experimental investigation of the properties of corrugated cylindrical surface waveguides

Barlow, H.E.M.; Karbowiak, A.E.

doi:10.1049/pi-3.1954.0042

Cited by 26 publications

(16 citation statements)

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“…X may be fixed arbitrarily at, say, 0.01. With a small transverse-decay coefficient, the 11 y 504 + 0.002/ 528 +10-1 0 / 600 +10" 16 y 720 +10-132 / 1008 +2 * 10-7 / 1056 +10-2 2 / 1200 +10-9 4 / 1440 +10-2 6 8 / energy extends a long way from the surface of the strip. The energy is loosely coupled to or trapped in the waveguide.…”

Section: Outer Radiusmentioning

confidence: 99%

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Dielectric-fibre surface waveguides for optical frequencies

Kao

Hockham

1986

IEE Proc. J Optoelectron. UK

106

114

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A dielectric fibre with a refractive index higher than its surrounding region is a form of dielectric waveguide which represents a possible medium for the guided transmission of energy at optical frequencies. The particular type of dielectric-fibre waveguide discussed is one with a circular cross-section. The choice of the mode of propagation for a fibre waveguide used for communication purposes is governed by consideration of loss characteristics and information capacity. Dielectric loss, bending loss and radiation loss are discussed, and mode stability, dispersion and power handling are examined with respect to information capacity. Physicalrealisation aspects are also discussed. Experimental investigations at both optical and microwave wavelengths are included. List of principle symbolsJ n = nth-order Bessel function of the first kind K n = nth-order modified Bessel function of the second kind 271 271

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Section: Outer Radiusmentioning

confidence: 99%

“…The corrugated metallic rods [10,11], with corrugated pitch much smaller than the operating wavelength, are used to simulate the dielectric-fibre waveguide. To a first approximation, the surface reactance of such a waveguide is derived by considering only the fundamental space harmonic.…”

Section: Micro Wa Ve Scaled Measuremen Tsmentioning

confidence: 99%

Dielectric-fibre surface waveguides for optical frequencies

Kao

Hockham

1986

IEE Proc. J Optoelectron. UK

106

114

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“…To cite specific examples relating to the case at hand, the surface impedance can be highly inductive when propagating over horizontally stratified media (Attwood, 1951;Barlow and Cull~n, 1953;Wait, 1953Wait, , 1957Wait, , 1962aWait, ,b, 1964Fernando and Barlow, 1956), corrugated surfaces (Barlow and Karbowiak, 1954;Zucker, 1954;Fernando and Barlow, 1956;Wait, 1957), or a surface which is uniformly rough (Wait 1%~ ' Some common examples of stratified media which might provide a highly inductive surface at low and very low frequencies are arctic ice on a nearly perfectly conducting sea or a poorly conducting layer of earth lying above a highly conducting sub~tratum. Indeed, some of the observed experimental anomalies over a supposedly plane, homogeneous earth can be explained by assuming that the ground is stratified.…”

Section: Introductionmentioning

confidence: 99%

Groundwave Attenuation Function for Propagation Over A Highly Inductive Earth

King

Schlak

1967

Radio Science

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Propagation of an electromagnetic groundwave over a plane surface in which the ar.gument of the surface impedance is greater than -rr/4 but less than -rr/2 is considered in some detail. The numerical distance, p, over such a surface is characterized by 0,;; arg p,;; -rr/2. The groundwave behaves in a peculiar manner, and this is attributed to the interaction of two phasor components representing a trapped wave and a Norton surface wave. Approximate expressions are derived which determine the magnitude and phase of the groundwave attenuation function when these two waves are inphase and antiphase. A. method is also given for estimating the asymptotic phase for large jpj which was previously not possible except through detailed calculations. Finally, detailed curves are presented which show the amplitude and phase of the groundwave attenuation function versus p.

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“…I was excited to see an actual circular waveguide [4] (Figure 1). I was assigned to look for new methods for microwave and optical transmission.…”

Section: Vignettes From Childhood and Working Life Memoriesmentioning

confidence: 99%