Array of Horns Fed by a Transverse Slotted Groove Gap Waveguide at 28 GHz

An array of low profile horns fed by transverse slots on a groove gap waveguide (GGWG) is presented. The GGWG is implemented with glide symmetrical holes and the design frequency is 28 GHz. The low profile horns are integrated in the same waveguide wall as the slots. The designed antenna is a linear array of these horns but the solution can be easily extended to a planar array. Experimental results support this work. The designed antenna is a good candidate for applications related to 5G technologies where medium to high gains as well as high efficiencies are required and reasonable manufacturing costs are demanded.

A new technique and results of measurements of dielectric and magnetic properties of loss dielectrics for vacuum tubes

A technique for measuring dielectric and magnetic properties of materials by the waveguide method is proposed in which the error, associated with the presence of gaps between the sample and the waveguide wall is eliminated by comparison with the results of numerical analysis of a 3D model the dielectric characteristics of which are optimized in order to achieve the best agreement between the calculated and experimental data.