Performance of a protruding-dielectric waveguide element in a phased array

Lewis, L.; Hessel, A.; Knittel, G.

doi:10.1109/tap.1972.1140304

Cited by 23 publications

(10 citation statements)

References 6 publications

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“…These results are in agreement with the experimental evidence [31] collected for plane arrays, where the notches in the element pattern due to bound waves are always more pronounced than the notches due to grating lobe effects.…”

Section: Unclassifiedsupporting

confidence: 91%

Analysis of Dielectric Slab-Covered Waveguide Arrays on Large Cylinders

Balzano¹,

Lewis²,

Siwiak³

1973

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This report presents a method for predicting the r overage obtainable from a small ar/ay of waveguide apertures (20 -30 dB apert ire gain) over a large cylinder covered by dielectric (cylinder radius * 100 A).An infinite array model is developed, which shows that there are only minor differences between the pattern of an element in a dielec ric clad cylindrical array and that of an element in the corresponding planar c\rray. This result suggests that the coverage of a finite dimension array over a c/linder of large radius can be evaluated with good approximation by the means of a planar array model. The coverage of arrays in an infinite ground plane covered by dielectric is predicted hy developing a model which takes into account several waveguide modes in matching the fields at the array aperture interface. This model does not require the inversion of large matrices in determining the mutual coupling between array elements, thus permitting the analysis of relatively large arrays. This model shows that no coverage in the endfire direction is obtainable from these structures. To achieve endfire cove^gc the dielectric sheet covering the array must be of finite dimension.The coverage from a finite planar array covered by a finite dielectric, slab is predicted by assuming a simple but effective model of the radiation from the wedge terminating the dielectric sheet. This model shows that it i3 possible to obtain substantial coverage in the endfire direction by properly shaping the wedge at the expense of some pattern distortions. The overall array performance shows that it is possible to obtain hemispheric, scan coverage with maximum gain oscillation of no more than A. 5 dB. t»

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Section: Unclassifiedsupporting

confidence: 91%

Analysis of Dielectric Slab-Covered Waveguide Arrays on Large Cylinders

Balzano¹,

Lewis²,

Siwiak³

1973

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“…The problem is 2-D (independent of the -coordinate) and the fields are taken to be to simulate -plane scan conditions. This commonly used 2-D analog possesses the most important physical attributes of the more practical 3-D problem [3]. Moreover, the 2-D formulation is algebraically simpler and, therefore, permits a clearer presentation of its analytical and numerical properties.…”

Section: Formulationmentioning

confidence: 99%

“…Of particular interest here are efforts to address the matching problem by including dielectric inserts-protrusions in the waveguide-to-free-space transition region. Among them is the early analytical work by Lewis et al [2], [3] on protruding dielectric slabs. In the Russian literature, analogous contemporaneous developments are cited in the paper by Skobelev et al [4], which presents a numerical method for dealing with shaped protruding dielectric elements.…”

Section: Introductionmentioning

confidence: 99%

An approach to analysis of waveguide arrays with shaped dielectric inserts and protrusions

Davidovitz

2001

IEEE Trans. Microwave Theory Techn.

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The classical moment method solution of the waveguide-array problem is extended to allow for generally shaped dielectric matching inserts in the waveguide-to-free-space transition region. The aperture electric field is represented in terms of waveguide modes. To account for the presence of the matching inserts, the aperture fields are numerically propagated through the dielectric regions. Novel matching configurations, which extend the scanning range of waveguide elements or can be used to shape the element pattern in limited-scan applications, are proposed and analyzed.

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“…Then, the voltage and current equations, (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21) and , respectively, take the form…”

Section: >0mentioning

confidence: 99%

Design and Analysis of Bifurcated Twin Dielectric Slab Loaded Rectangular Waveguide. Dual Frequency Array Elements

Pozgay¹,

Fassett²,

Lewis³

1977

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List of Illustrations (continued) 34. Disposition of Roots of D(K,K.) Along Real K. Axis ... 84 35. LSE Dispersion Diagram for Bifurcated WRI87 Guide With 85 250" Thick Er = 9 Loading 36. LSE Dispersion Diagram for Bifurcated WR137 Guide With • 89 250" Thick e 3 Loading 37. LSE Dispersion Diagram for Bifurcated WR137 Guide With, • • 90 .250" Thick Er = 5 Loading 38. LSE Dispersion Diagram for Bifurcated WR137 Guide With. . 91 .250" Th..k er 7 Loading 39. LSE Dispersion Diagram for Bifurcated WR137 Guide With. 92 .250" Thick er = 9 Loading 40. LSE Dispersion Diagram for Bifurcated WR137 Guide With 93 .063" Thick er = 5 Loading 41. LSE Dispersion Diagram for Bifurcated WR137 Guide With 94 .125" Thick Er = 5 Loading 42. LSE Dispersion Diagram for Bifurcated WR137 Guide With .95 .188" Thick er = 5 Loading 43. LSE Dispersion Diagram for Bifurcated WR137 Guide With. . 96 .375" Thick er = 5 Loading.

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Performance of a protruding-dielectric waveguide element in a phased array

Cited by 23 publications

References 6 publications

Analysis of Dielectric Slab-Covered Waveguide Arrays on Large Cylinders

Analysis of Dielectric Slab-Covered Waveguide Arrays on Large Cylinders

An approach to analysis of waveguide arrays with shaped dielectric inserts and protrusions

Design and Analysis of Bifurcated Twin Dielectric Slab Loaded Rectangular Waveguide. Dual Frequency Array Elements

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