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The Microwave Sources for EPR Spectroscopy

Hruszowiec M., Nowak K., Szlachetko B., Grzelczak M., Czarczyński W., Pliński E. F., Więckowski T.

Journal of Telecommunications and Information Technology

2017

nr 2

18--25

Rapid development of many scientific and technical disciplines, especially in material science and material engineering increases a demand for quick, accurate and cheap techniques of materials investigations. The EPR spectroscopy meets these requirements and it is used in many fields of science including biology, chemistry and physics. For proper work, the EPR spectrometer needs a microwave source, which are reviewed in this paper. Vacuum tubes as well as semiconductor generators are presented such as magnetron, klystron, traveling wave tube, backward wave oscillator, orotron, gyrotron, Gunn and IMPATT diodes. In this paper main advantages of gyrotron usage, such as stability and an increased spectral resolution in application to EPR spectroscopy is discussed. The most promising and reliable microwave source is suggested.

A Computer-controlled System of High-power Microwave Sources

Korpas P., Gryglewski D., Wojtasiak W., Gwarek W.

International Journal of Electronics and Telecommunications

2011

Vol. 57, No. 1

121-126

The paper presents the design and hardware implementation of a computer controlled system composed of up to four high-power microwave sources. Each source provides up to 200 W of continuous wave power. Frequency of each source is stabilized within ±0.5 ppm of the nominal frequency adjustable within 2.35÷2.6 GHz range. All four sources can be synchronized to the same frequency with computer-controlled phase shift between the signals generated by each of them. The paper concentrates on the choice of components for such a system and the properties of the realized hardware implementation.