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Lesson 7_Microwave Devices MICROWAVE DEVICES Conventionally, the lower boundary for microwave signals is set at 1 GHz At low fr equencie s, the inductance an d capac it ance of  component leads can be ignored; at microwave frequencies, even sho rt connect ing lea ds have sig ni fic ant capac iti ve and inductive reactance, so component construction becomes critical Passive Components Using waveguides requires the redesign of some components that used with feedlines  Typical passive components include: Bends and Tees Cavity Resonators Attenuators and Loads Circulators and Isolators a. Bends and Tees Anything that changes the shape or size of a waveguide has an effect on the electric and magnetic fields inside As long as bends or twists are gradual, the effect is minimized b. Cavity Resonators A cavity resonator is designed to be resonant with the signal being transmitted Waves are in phase with the incident signal  The Q for resonant cavities is very high Cavities are tuned by changing their size 1

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