Lockheed Martin Corporation
Multi-band circularly polarized waveguide feed network

Abstract:

A multiband waveguide feed network includes multiple transmit (TX) magic tees, multiple receive (RX)-reject waveguide filters configured to reject RX frequencies, and multiple branch-line couplers configured to couple the plurality of RX-reject waveguide filters to the plurality of TX magic tees. The multiband waveguide feed network includes a quadrature junction coupler configured to couple the plurality of RX-reject waveguide filters to an antenna port. The multiband waveguide feed network is configured to be fabricated in four pieces with three split planes, and the multiband waveguide feed network is circularly polarized.