The launching of surface waves on an axial-cylindrical reactive surface

Wenger, N. C.

doi:10.1109/tap.1965.1138360

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…Chopped surface wave method The launching efficiency of the horn [6] can be estimated by this very simple technique. The power lost to radiation and reflection is estimated by calculating the percentage of insular guide modal power which lies outside the launching aperture.…”

Section: Psmentioning

confidence: 99%

Analysis of Insular Guide Launcher Radiation Loss and Comparison with Microstrip Counterparts

John¹,

Henderson²,

James³

1982

12th European Microwave Conference, 1982

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An analysis of a launching configuration enables the radiation loss associated with the feed region of a millimetre wave insular guide to be assessed. Series expansions of the guide fields are used in conjunction with a variational formulation of the launcher loss which is computed for various guide parameters and dimensions . An alternative assessment of loss based on a chopped surface wave distribution is also presented and reveals other effects present. Finally a comparison with typical launching losses for microstrip lines is made and some experimental data is also given. It is concluded that for some circuit and antenna applications the use of micros trip rather than insular guide could lead to an overall lower system loss. INTRODUCTIONThe past decade has witnessed an upsurge of interest in designing radar and communication systems at millimetre wavelengths. Much attention has been focussed on the use of dielectric structures, such as image and insular guide [1] in filters, waveguides and antennas [2], due to their low transmission loss at these wavelengths. In the case of antennas, the planar construction of the new dielectric arrays is particularly useful for conformal applications [31 and has the potential for full integration with similarly constructed feed systems. At present, however, conventional waveguides are predominantly being used for millimetre systems, in preference to microstrip lines, due to their lower transmission losses. Whilst this achieves a reduction in system loss, it does introduce a degree of incompatibility with the new dielectric planar array structures which can result in a significant radiation loss at the feed point. This places a different emphasis on the merits of these dielectric-type arrays in comparison to their microstrip counterparts and the purpose of the paper is to obtain by analysis an assessment of * typical launcher radiation loss associated with use of insular guide. * comparative data for microstrip structures.* system implications for millimetre wave circuits and antemnas using these guides. ANALYSISThe launcher used in practise, shown in Figs 1 (c) and 3(a), consists of a conventional waveguide horn, with a tapered insular guide insert to obtain a good VSWR. For the purposes of obtaining some estimation of the radiation loss, we have analysed a more simplified model of the launcher consisting of a parallel plate waveguide, fitted with an insular guide insert and the top metal plate abruptly terminated. Before we consider the launching mechanism, we have to obtain an adequate representation of the basic insular guide fields, firstly bounded by the top metal plate of 534

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Section: Psmentioning

confidence: 99%

Analysis of Insular Guide Launcher Radiation Loss and Comparison with Microstrip Counterparts

John¹,

Henderson²,

James³

1982

12th European Microwave Conference, 1982

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“…Early investigations to solve the problem of excitation of surface waves by a circular wave guide over a dielectric rod and by a parallel plate wave guide over a plane dielectric surface were reported in the past Chang, 1953, 1959]. Similarly, the excitation of a dielectric-coated conductor by a coaxial line received considerable attention [ Wenger, 1965;Ledeboer, 1965]. In addition, details of launchers and their design procedures are described in the literature [Barlow and Brown, 1962].…”

Section: Introductionmentioning

confidence: 99%

On the coaxial excitation of the modified Goubau line

Rao¹,

Hamid²

1980

Radio Science

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The problem of excitation of the modified Goubau line from a coaxial junction is analyzed using the Wiener‐Hopf technique and Fourier transforms in the axial direction. The analytical expressions reduce to those of Ledeboer in the absence of the air gap. The effects of the air gap in reducing the input reflection coefficient and in modifying such other parameters as the launching efficiency and propagation constants for different frequencies are illustrated with numerical examples.

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Wave Propagation in Inhomogeneous Media

Karbowiak

1967

Electromagnetic Wave Theory

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The launching of surface waves on an axial-cylindrical reactive surface

Cited by 8 publications

References 5 publications

Analysis of Insular Guide Launcher Radiation Loss and Comparison with Microstrip Counterparts

Analysis of Insular Guide Launcher Radiation Loss and Comparison with Microstrip Counterparts

On the coaxial excitation of the modified Goubau line

Wave Propagation in Inhomogeneous Media

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