资料介绍
70539_16Q
Q-FACTOR
DARKO KAJFEZ
University of Mississippi University, Mississippi
1. INTRODUCTION Figure 1 shows several one-port resonators. The lumpedelement resonator in Fig. 1a is a simple parallel-resonant circuit, the resonant frequency of which is 1 o0 p LC 1
At this frequency, the absolute value of the input impedance reaches a maximum (admittance reaches a minimum). At other frequencies, the absolute value of impedance monotonically decays according to a well known bell-shaped curve in Fig. 2. In the elementary circuit theory, the Q factor of the parallel resonant circuit is dened as Q0 o0 C G0 2
At rf and microwave frequencies, the resonators are seldom built in the form of lumped inductances and capacitances. Instead, they consist of distributed circuits, such as a half-wavelength-
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