The input impedance of a circulator with an inphase eigen excitation resonator can be expressed by that of a 2-stage bandpass filter. The external Q factor of an inphase eigenexcitation resonator should be three-quarters that of rotational-phase eigen-excitation resonators to obtain a maximally fiat performance.
Published in:
Electronics Letters
(Volume:9
,
Issue:
12
)
Date of Publication: June 14 1973