A Focused Aperture Millimeter Wave Transmission Line

Design details are presented for an open waveguide RADAR transmission line. This 94 GHz quasi-optical guide is presently in use at The Aerospace Corporation Laboratories, with two focusing mirrors and offset reeds providing power transfer and rotary joint action for a scanning 15' diameter parabolic antenna. Experimental results are given for the beam shapes, phase contours, insertion loss, and isolation of the beam guide.