Helical coupler from rectangular-to-circular waveguide

Details Helical coupler from rectangular-to-circular waveguide Helical coupler from rectangular-to-circular waveguide

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976itmtt..24..847p&link_type=abstract

IEEE Transactions on Microwave Theory and Techniques, vol. MTT-24, Nov. 1976, p. 847-852. NSF-supported research.

Computer Science

Antenna Couplers, Helical Antennas, Radio Telescopes, Rectangular Waveguides, Transmission Efficiency, Waveguides, Antenna Arrays, Antenna Design, Cross Sections, Directional Antennas, Microwave Coupling, Propagation Modes, Very Large Array (Vla)

Scientific paper

The very-large-array (VLA) radio telescope utilizes a low-loss TE-01 circular waveguide transmission system. During the design of this system a coupler was developed which couples directly from a standard millimeter rectangular waveguide to the TE-01 mode in highly overmoded circular waveguide. In contrast to previous couplers which used periodically spaced groups of coupling holes, this design wraps the rectangular waveguide in a helix around the circular waveguide to give a continuous array of coupling apertures for maximum coupling and a compact mechanical configuration. In particular, couplers have been designed and fabricated which couple from WR-28 (26.5-40 GHz) and WR-22 (33-50 GHz) rectangular waveguides to the TE-01 mode in 20- and 60-mm-diam circular waveguide.

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