Bends in a compact circularly polarized microwave feed

A method for coupling microwave energy to multiple modes of a cavity comprising the steps of:

• providing energy at an input polarization to a polarization waveguide section which contains an asymmetrical element having a shape such that it presents symmetry to microwave energy about a plane;
• and
• presenting energy exiting from the polarization waveguide section to an exit waveguide section, the exit waveguide section having a bend along a direction of microwave energy propagation therein, the bend such that an inner radius of the bend is shorter than an outer radius of the bend so that the bend introduces an additional electrical symmetry about a symmetry plane.

A method for coupling microwave energy to multiple modes of a cavity comprising the steps of:

• providing energy at an input polarization to a polarization waveguide section which contains an asymmetrical element having a shape such that it presents symmetry to microwave energy about a plane;
• and
• presenting energy entering the polarization waveguide section from an input waveguide section, the input waveguide section having a bend along a direction of microwave energy propogation therein, the bend such that an inner radius of the bend is shorter than an outer radius of the bend so that the bend introduces an additional electrical symmetry about a symmetry plane.