At the end of the course, student will be able to Explain the characteristics of different wave guide structures From the setup above, the signal frequency of the microwave source is varied, keeping the signal level constant and then the output power is measured The cavity resonator is tuned to this frequency, and the signal level and the output power is again noted down to notice the difference. This measurement technique is vastly different from that of the more conventional techniques The methods are based on the wave character of high frequency currents rather than on the low frequency technique of direct determination of current or voltage.
This video provides you with a detailed understanding of low frequency measurement vs microwave measurements. There are three popular devices for sensing and measuring average power at rf and microwave frequencies Each of the methods uses a different kind of device to convert the rf power to a measurable dc or low frequency signal. The reason is that the size of a typical microwave circuit is comparable the wavelength, so phase variation along a portion of the circuit cannot be ignored as is the case at lower frequencies. At low frequency, it is convenient to measure voltage, current and frequency and use them to calculate the power However, at microwave frequencies, the amplitude of the voltage and current on a transmission line are function of distance and are not easily measurable.
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