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For original paper by R. Li and L. Zhu, see ibid., vol. 17, no. 1, p. 40-42, (2007). An unloaded MMR must have a sufficiently large impedance ratio (R >5) so that the leading three resonances have a relatively close proximity to form a broad passband. Therefore, at least two points are worth investigating from circuit design point of view. One is that the B value of the unloaded MMR is only 1.5, and the other is where the fourth resonance and the zero come from.
Date of Publication: Nov. 2007