
End scattering:
;
.


Frequency response and phase response of an open resonator.

;
.
Longitudinal resonance due to phase balance
;
;
.
Consider separately the frequency resonance and angular resonances:
one) 
frequency dependent it is known that
,
,
,
,
,
,
,
.

,
.
Set the frequency response near the resonance if
then 
- phase detuning,
,
,
,
,
,




,
Q without active element:
,
,
,
,
Q with active element: 
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Quantum electronics
Terms: Quantum electronics