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Observed 50 to 60 Gc/s Attenuation for the Circular Electric Wave in Dielectric-Coated Cylindrical Waveguide Bends

1966; Institute of Electrical and Electronics Engineers; Volume: 45; Issue: 5 Linguagem: Inglês

10.1002/j.1538-7305.1966.tb01053.x

2376-7154

Glenn E. Conklin,

Gyrotron and Vacuum Electronics Research

A thin low-loss dielectric coating inside a 0.875-inch i.d. round waveguide was achieved by drawing a slightly oversize flexible tube of polyethylene into the waveguide. The plastic tube fits snugly to the guide wall. Several 14-foot lengths of waveguide were lined and loss measurements made. The lined pipes were 8 per cent lossier than the unlined. The increase in loss could be almost completely accounted for by the theory of H. Unger. A 92° Fresnel integral bend (curvature a linear function of arc length) was constructed from a 14-foot section of the 0.875-inch i.d. lined waveguide. The insertion loss between 50 and 60 Gc/s had a value of about 0.1 db. This small value is close to the theoretical result for such bends.