A Technique of Providing an on-Axis Beam from a Circular Waveguide Operating in the TE01 Mode at Millimeter Wavelengths

摘要

The objective of this investigation was to devise a technique for producing an on-axis beam from a circular waveguide operating in the TE sub 01 circular waveguide mode at millimeter wavelengths and at relatively high power levels. Such a device could be used as the feed for lens or reflector type high gain antennas. One such basic device was conceived. Two variations of the basic device were constructed and tested at low power levels. The basic device involved dividing the circular waveguide into halves with a thin baffle and obtaining a 180 degrees phase shift in one half of the guide with respect to the other, thus providing an on-axis beam through one cut of the circular waveguide as opposed to a null on-axis for all cuts. Comments are made concerning the construction, band coverage and probable power handling capabilities of the device. (Author)