Abstract
Instantaneous frequency measurement devices are useful for conducting extremely fast measurements of the current frequency value of microwave signals, even if their duration is extremely short. This paper presents the principle of determination of temporary values of the microwave signal phase and frequency using interferometer techniques, based on passive microwave components. Additionally, the structures and results of measurements of two novel versions of integrated microwave correlators for microwave frequency discriminators, made on a single printed circuit board, are shown. Three Wilkinson-type, single-stage power dividers, and two rat-race hybrids create the developed correlators. The developed devices were designed to work over a wide frequency range, i.e., of 1.6–3.1 GHz, and can be used to monitor Wi-Fi devices as well as pulse and CW radar systems operating in the S band. They can also be applied in passive radars and active Doppler radars. The view of the printed circuits boards and results of measurements are presented. Recommendations for improving the accuracy of measurement are proposed.
Highlights
IntroductionAcademic Editors: Ondrej Fišer and Lubos Rejfek
The power meters are controlled by a computer with a program for estimating the temporary values of the frequency of the microwave signal fed to port 1
The presented microwave frequency discriminators can work as an important block of instantaneous frequency measurement devices for electronic warfare applications and for measurements of internal frequency modulation of microwave signals emitted by CW radars, pulse radars, Doppler radars, and other telecommunications transmitters
Summary
Academic Editors: Ondrej Fišer and Lubos Rejfek. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Microwave frequency discriminators (MFD) and microwave phase discriminators (MPhD) are the fundamental elements of instantaneous frequency measurement (IFM)
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