ABSTRACT
In waveguide and transmission-line circuits, just as in lumped-element circuits of a more conventional nature, resonant elements find a wide range of application. Filters, frequency measuring devices and oscillators all involve resonators of one sort or another, but at higher frequencies, even radiating elements are resonant circuits. The properties of lumped-element resonators will be examined in this chapter, while later in the chapter the authors study cavity resonators, dielectric resonators and other such devices based on their electromagnetic field descriptions. The act of connecting a resonator to an external circuit will inherently modify its behavior, but it is usually desired to make such modification as small as possible. The authors investigate the effect of connecting an external load to a lumped-element resonator. For lumped-element resonators, they have studied the coupling process in the chapter.
