Accession Number : ADD009689

Title :   A Coaxial Waveguide Commutation Feed Network for Use with a Scanning Circular Phased Array Antenna.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Irzinski,Edward P

Report Date : 24 Feb 1982

Pagination or Media Count : 17

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)

Descriptors :   *Patent applications, *Phased arrays, *Commutators, *Antenna arrays, *Sidelobes, *Antenna feeds, Insertion loss, Distribution, Transitions, Geometry, Bandwidth, Networks, Low loss, Low level, Radiation, Amplitude, Impedance, Feeding

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE