Abstract

The paper presents a few practical measurement of the transmission and reflection coefficients of a circuit at microwave frequencies. The measurements are strictly necessary for designer in order to check thei design products practically and modify them. The measurement procedure uses some basical measuring instruments operating at microwave frequencies (sweep generator, spectrum analyser directional couper, ...) are used, some passive circuits (low-pass or band-pass filter, couper...) are realized by microtrip technology. The measurements provided relatively accurate results and fitted well to the intentional design parameters, such as the working frequency band, the impedance matching...