US Patent:
20090309801, Dec 17, 2009
Inventors:
Sudhakar K. RAO - Churchville PA, US
Chris G. Baran - Hamilton NJ, US
Chih-Chien Hsu - Cherry Hill NJ, US
Surjit S. Dhillon - Robbinsville NJ, US
Assignee:
Lockheed Martin Corporation - Bethesda MD
International Classification:
H01Q 13/02
H04B 7/14
Abstract:
An antenna system for transmitting and/or receiving radio frequency (RF) signals in multiple frequency bands includes a horn antenna and a feed network. The horn antenna may transmit and/or receive RF signals in multiple frequency bands that are spread over more than an octave bandwidth with at least a 2.44-to-1 bandwidth ratio. The horn antenna includes a throat, an aperture, and an interior surface. The feed network includes a first waveguide section, a first junction, one or more first filters, and a first step-down waveguide section. The first waveguide section can provide a matching network and transmit and/or receive the RF signals in the multiple frequency bands. The first junction can transmit and/or receive the RF signals in first selected band(s) of the multiple frequency bands. The first step-down waveguide section may transmit and/or receive the RF signals in second selected band(s) of the multiple frequency bands.
