PERIODIC CYLINDER ARRAYS AS TRANSMISSION LINES
Abstract
Periodic structures of conducting cylinders were used as radiators (Yagi antennas), and as slowwave lines in traveling-wave tubes and masers. It is shown that a non-resonant structure may have interesting capabilities as an open surfacewave transmission line. By means of a relatively simple matching network, efficient excitation of a surface-wave on the periodic line was obtained. Response was flat over a 20% frequency range at x-band for several combinations of cylinder lengths and spacings. Total insertion losses are less than 3 db and largely independent of length of transmission line. Conducting cylinders were embedded in styrofoam. The effects of bends and twists in the line were investigated. It is shown experimentally that a guided wave on this periodic structure can follow a circular path having 1.5 lambda radius of curva ure with very little loss. By terminating the transmission line with short circuits at both ends, a discreet series of transmission maxima was observed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 15, 1962
- Accession Number
- AD0286973
Entities
People
- Joshua Shefer
Organizations
- Harvard University