Microwave insertion loss measurements in phosphate glasses containing transition metal oxides

The scope of this work is to report the results of microwave insertion loss measurements as a function of frequency and composition of some selected phosphate glasses containing transition metal oxide. Borosilicate glasses are commonly used in microwave travelling wave tubes, microwave windows, etc. They present very high microwave transmittance (low microwave insertion loss) in a certain frequency domain, which must be a very important feature for microwave power applications. The works regarding, microwave insertion loss studies in glass systems are found to be very scarce at present. The results show that there is a possibility Of our glasses being used in windows for high-power microwave tubes, once the microwave signal insertion loss at the frequencies of 8.3 and 11.8 GHz attains values nearly 0 dB. The results show that it is possible to control the 9.7 GHz absorption peak, by increasing the transition metal oxide concentration in the glass, above a certain value. The transmittance technique can also be used for the study of a greatest variety of materials.