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Phasor analysis of a.c. circuits
Published in David Crecraft, David Gorham, electronics, 2018
may also be used to define the Q-factor of an RLC circuit. In practice, the actual value of Q might be found by dividing the measured value of the resonant frequency by the measured value of the 3 dB bandwidth.
A monostatic RCS reduction study for an antenna in structural mode at X band
Published in International Journal of Electronics, 2023
The equivalent circuit diagram for the low RCS antenna has been extracted to understand the working mechanism clearly as illustrated in Figure 7(a). The equivalent circuit of the antenna structure is obtained by a parallel RLC circuit approach due to the numerically calculated Z matrix results given in Figure 7(c,d). Therefore, the schematic parameters of the equivalent circuit demonstrated in Figure 7(a) have been extracted by using a standard RLC circuit impedance calculator. The RLC circuits can resonate at the resonance frequency and the resonance is observed when there is no reactance and only a resistive effect in the circuit. The reason for using two parallel RLCs is to obtain identical bandwidth characteristics with the proposed antenna. The series inductor achieves to compensate capacitive effect resulting from features of the dielectric substrate. The equivalent circuit consists of parallel RLCs connected to a series inductor and a 50Ω transmission line. The return loss parameter and impedances of the equivalent circuit have been compared with antennas in Figures 7(b-d). Return loss is monitored at around 5.4 GHz with a reflection coefficient of −40 dB as other antennas. Although there is a small deficiency, the real and imaginary impedances of all three structures have shown the same characteristics. While the imaginary parts of the impedances are going to zero, the real parts of them are reaching the maximum level.