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Triangular wave
The X-band microwave bench is a system which provides standard type rectangular wave-guide components. It includes the study of reflex Klystron and impedance measurement.
The three waveforms in the trigger circuit of an oscilloscope are the sine wave, square wave and saw tooth wave.
As a sinusoidal signal is clipped the waveform approaches a square wave.
Arif Ullah khan utman kheel this is because for conductor E parallel is zero this means that the surface of the wave guide is at equipotential and this potential follow the laplace equation .it means that there is no maxima and minima inside the wave guide . this means that the electric field inside zero . hence the TEM do not exist in wave guide only TE and TM can be exist . if we place some conductor in the wave guide then the conductor inside will not be equipotential and the TEM waves can be exist . like in Coaxial cables