A Coaxial Waveguide Commutation Feed Network for Use with a Scanning Circular Phased Array Antenna.
Abstract
A dominant TEM mode and a pair of spatially orthogonal TE11 modes suitably excited at the input ports of a coaxial waveguide commutator portion of a coaxial waveguide commutation feed network are employed to generate a commutatable low-sidelobe amplitude distribution at symmetrically disposed peripheral output ports of the coaxial waveguide commutator. The resulting low-sidelobe amplitude distribution can be used to feed radiating elements of an associated circular phased array antenna. The coaxial waveguide commutator is configured, inter alia, with a linearly tapered inner conductor surrounded by a uniform tube outer conductor to achieve a smoother TEM-dominant mode characteristic impedance transition from the input port plane to the output port plane thereof. Employment of this feed geometry, in conjunction with balanced four-port feeding of the coaxial waveguide commutator which inhibits the higher order TE modes, increases the bandwidth capability while maintaining low insertion loss. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 24, 1982
- Accession Number
- ADD009689
Entities
People
- Edward P. Irzinski
Organizations
- United States Department of the Navy