Estimation of Power Bus Resonance Suppression by Lossy Resonator Filter in the Wi-Fi Band Using Equivalent Circuit Model

We investigated the power bus resonance suppression effect obtained by implementing a lossy resonator filter tuned to a resonant frequency of 2.45GHz, which corresponded to the center frequency of the 2.4GHz band used for Wi-fi communication. When we compared the suppression amount values obtained by the estimation formula based on the equivalent circuit model and full-wave analysis, the discrepancy was less than approximately 2dB, and indicates relatively high accuracy due to the absence of higher-order resonances. Therefore, it was found that even when the resonant frequency of the lossy resonator filter does not match the anti-resonant frequency of the power bus, the suppression amount can still be estimated within approximately 2dB. This is useful for deriving a bandwidth estimation formula for the suppression characteristics of the lossy resonator filter.