A low‐cost, easy to fabricate waveguide‐to‐microstrip E‐probe transition for the entire × band is introduced. Experimental data shows the E‐probe transition to be broadband with low insertion loss. The design of a test fixture to characterize accurately a single waveguide‐to‐microstrip transition is also presented.

The theoretical resonant length and experimental normalized conductance of inclined slots are applied in the design of an X-band edge slot waveguide array antenna over the frequency range of 9.5 to 10.5 GHz. The array consists of eight radiating slots machined in the narrow wall of a WR90 waveguide. The array has a non-uniform amplitude distribution with all of the elements fed in-phase. Since the array consists of only eight elements, each element contributes significantly to the overall antenna's characteristics. Experimental results of the measured slot conductances and a formula for the slot depth, including the waveguide wall thickness, for any slot orientation less than 46.6" is presented. This data was used to determine the amplitude distribution and configuration for each element of the array. Measured radiation patterns are presented and characteristics of the antenna examined.

This paper describes a ferrite antenna that can produce any polarization on the Poincaré sphere over the frequency range of 9.0 to 11.4 GHz by utilizing Faraday rotation and a quarter-wavelength phase shifter. All possible polarizations of the electromagnetic wave are achievable with this antenna which includes linear, circular and elliptical polarizations. Any tilt angle of elliptical polarization and any orientation of the linear polarization can be achieved as well. The polarization of the ferrite antenna can be electronically switched to a different polarization instantly without the use of moving parts. An automatic data acquisition system was designed and built to fully analyze the antenna' s characteristics.

This article considers mutual coupling as a function of the skew angle between rectangular microstrip patch antennas configured in a two‐element array. Reflection and transmission data for antenna arrays are presented with emphasis on the measured mutual coupling between the elements for varying skew angles.