Low-power microwave sources use solid-state units such because the field-effect transistor , tunnel diodes, Gunn diodes, and IMPATT diodes. Low-power sources are available as benchtop devices, rackmount instruments, embeddable modules and in card-level codecs. A maser is a strong state device which amplifies microwaves using similar principles to the laser, which amplifies larger frequency mild waves. As a consequence, sensible microwave circuits have a tendency to maneuver away from the discrete resistors, capacitors, and inductors used with lower-frequency radio waves. Open-wire and coaxial transmission traces used at decrease frequencies are replaced by waveguides and stripline, and lumped-element tuned circuits are replaced by cavity resonators or resonant stubs.
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