Microwave Electronics by Andrey D. Grigoriev Vyacheslav A. Ivanov & Sergey I. Molokovsky

Author:Andrey D. Grigoriev, Vyacheslav A. Ivanov & Sergey I. Molokovsky
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Circuit efficiency can be expressed in terms of loaded , external and intrinsic Q-factors of the cavity:

Loaded Q-factor can, in turn, be expressed in terms of unloaded and external t Q-factors:

For an open waveguide-type resonator, the unloaded Q-factor is determined as the ohmic Q-factor which characterizes the energy losses in the resonator walls. The external Q-factor is identified by the diffraction Q-factor of the cavity , which characterizes the energy loss due to radiation. Since the radiated energy in this case is directed to the output waveguide and represents the output energy of the device, the diffraction Q-factor plays the role of the external Q-factor.

Thus, for a loaded Q-factor and resonator efficiency, we obtain the following formulas:

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