Communications: radio wave antennas – Antennas – Wave guide type
Patent
1979-08-22
1980-10-28
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
333 21R, H01Q 1302
Patent
active
042310423
ABSTRACT:
The present invention relates to a hybrid mode waveguide or feedhorn antenna for transforming the TE.sub.11 mode into the HE.sub.11 mode. The waveguide or feedhorn comprises a circular waveguide including a tubular section at the TE.sub.11 mode entrance port changing in the antenna configuration to a conical section that flares outward to the feedhorn mouth, and a spiro-helical projection bonded to the interior surface of the waveguide. In a first arrangement, the spiro-helical projection comprises an initially flattened dielectrically coated wire that gradually returns to a rounded configuration in closely spaced helical turns after which the spacings between turns gradually increase linearly in the tubular section and then continue with uniform spacings in the conical section. In a second arrangement, multiple layers of closely-wound helically wound dielectrically coated wires, which layers gradually taper down to a single layer, can replace the closely spaced flattened-to-round wire section of the first arrangement.
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Bell Telephone Laboratories Incorporated
Lieberman Eli
Pfeifle Erwin W.
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