A frequency scanning waveguide slot-array antenna has been designed and simulated. The antenna has 24 radiating elements and has been designed to work in the 6.6-6.9GHz frequency band. The slot width is taken about 4mm and for the convenience of the mechanical fabrication of the antenna, the dumbbell shaped slots has been used. The beam width of the antenna is about 5-6 degrees. The main lobe direction is about 90 degrees at the start of the frequency band namely 6.6GHz and the main lobe rotates about 5 degrees for every 50MHz change in the input frequency. The software CST Microwave Studio has been used to simulate the behavior of the antenna. The antenna has a simple mechanical structure which leads to a simple fabrication process.

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In this paper, wave interaction with a ferrite material in a rectangular waveguide system is analyzed by using the transmission line (TL) model at Ku band. Using the presented model, the equivalent transverse admittance of the system is extracted. According to the corresponding relationship between the transverse admittance and the scattering parameters (S 11 , S 21 ) of the system, the saturation magnetization and permittivity of a ferrite material (4πMs and ϵ r ) are extracted. In comparison to other works, the proposed method has made the implementation very easy and has eliminated the problems associated with phase measurement and calibration. The presented model is simulated on the several types of ferrites and experimentally is tested on an SL-470 ferrite sample. Comparison of the results shows that the extracted parameters are close to the manufacturing values with %5 error. K E Y W O R D S ferrite, material characterization, rectangular waveguide, scattering parameters, transmission line

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