Design & testing of reflectors for microwave interferometer using free-space microwave measurement system / Eliza Hamzah

The main objective of this project is to design and testing of reflectors for microwave interferometer using free-space microwave measurement system at the microwave frequencies in the range of 7.5 to 14.5 GHz. Throughout this experiment, different composite material samples with different thicknesses are used to obtain resonant frequency response. The sample had to be sandwiched between these two reflectors. This free-space measurement system is used to measure the reflection coefficient, S 11. The measurement system consists of transmit and receive horn lens antennas, a vector network analyser, mode transitions and a computer. Diffraction effects at the edges of the samples are minimized by using spot-focusing lens antennas. Errors due to multiple reflections between antennas via the surface of the sample are corrected by using a freespace LRL (line, reflect, line) calibration technique.