They're not vacuum tubes, but if the frequency-gap product is too large in these devices, the resulting electron cascade can destroy them via the multipactor effect.
They're not vacuum tubes, but if the frequency-gap product is too large in these devices, the resulting electron cascade can destroy them via the multipactor effect. Sommerfeld sometimes lends his name to one of these devices invented by George Goubau. The effective index method is not as good as the Marcatili method for approximating behavior inside these structures. The natural one formed by the lower boundary of the ionosphere and Earth's surface can explain Schumann resonance. Solving Maxwell's equations with appropriate boundary conditions yields hybrid, TM, TE, but not TEM modes in the one-conductor rectangular form of these devices. For 10 points, identify these structures like optical fibers that force linear propagation of electromagnetic radiation.
They're not vacuum tubes, but if the frequency-gap product is too large in these devices, the resulting electron cascade can destroy them via the multipactor effect.
waveguides