A new method is proposed for measuring the loss tangent of flat substrate materials using the split cylindrical resonator method. It is based on a full-wave analysis and a rigorous mode match solution for the TE 011 mode. The dielectric losses of several commercial substrates have been measured. The results demonstrate that the proposed non-destructive method is capable of accurately characterizing the dielectric loss of flat substrate materials.

No abstract

This paper presents a design of a compact tri‐band feed horn for reflector, which has sufficient wide‐distributed operating bands at 14.5, 35, and 94 GHz. A single cavity is used to downsize and simplify the whole structure, replacing multiple transition sections, or dielectric rods. To maintain a good isolation, two 3‐order low‐pass filters are applied in the waveguide ports of Ku/Ka‐band respectively, meanwhile retaining a good coupling and minimal destruction on transmission modes. The prototype of the proposed tri‐band feed horn is fabricated and measured, showing an adoptable candidate for multiband reflector antennas.