Coaxial waveguide commutation feed network for use with a scanni

Details Coaxial waveguide commutation feed network for use with a scanni Coaxial waveguide commutation feed network for use with a scanni

1982-02-24

1984-05-01

Gensler, Paul L.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

333 34, 333226, 333233, 333136, H01Q 322, H01Q 324, H01Q 326, H01P 512

Patent

active

044464630

ABSTRACT:
A dominant TEM mode and a pair of spatially orthogonal TE.sub.11 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.

REFERENCES:
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patent: 4103262 (1978-07-01), Woodward
Young, Victor J. and Jones, Meridith W., Pictorial Microwave Dictionary A der Publication, 1956, pp. 29 and 95.

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