A compact septum polarizer

A notched septum waveguide polarizer theory has been developed whose results are presently compared to experimental results for two different waveguide device designs. It is noted that with one notch, isolation as good as 20 dB is obtainable over a 3.2-percent bandwidth, although phase control is not possible and the design is not useful for circular polarization. Good isolation is obtainable with a two-notch design over a wider band, and phase is controllable to the extent that a 20-dB separation of circular polarization can be obtained over a 3.7-percent bandwidth.