Surface and Anomolous Waves on Phased Arrays of TEM Waveguides with Fences.
Physical sciences research papers,
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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The report describes the behavior of an infinite array of parallel plane waveguides in a conducting ground plane with metallic fences perpendicular to the ground plane and spaced halfway between each pair of radiators. The study is mainly concerned with anomolous wave nulls and their relation to endfire surface-wave radiation, and, in addition, some data is presented to demonstrate the scan-matching properties of the fence geometry. An interesting new development in open periodic structure theory is reported and is shown to apply to both surface waves and anomolous waves. Certain restrictions on the phase distributions of the aperture fields and fence currents are revealed and studied in detail. In addition to these basic relationships, a numerical study of the scanning properties of waveguide-fence arrays is presented which has indicated that structures of this type can reduce impedance variation during scan and can be especially useful when it is desirable to scan very near to, or even slightly beyond, the point at which a grating lobe moves into real space. Author
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