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A nonuniform scaling technique is proposed for the synthesis of lossy filters realized by parallel-coupled pairs. By adding two or more non-resonating nodes for each coupled pair to nonuniformly distribute the losses, more design freedom can be provided to adjust Q-factors. For the fourth-order generalized Chebyshev filter, a uniform Q is obtained with Q=490. And for a 10-4-4 lossy filter, the insertion...
In this paper, a lossy triple-mode microstrip filter is proposed, where the nonuniform-Q method is applied. By properly loading a resistor on the resonator, only the Q-factor of odd mode is reduced to its optimized value. The passband flatness can be significantly improved. In comparison with the conventional filter counterpart, our proposed filter shows an enhanced bandwidth with a small variation...
A negative resistive coupling coefficient between two resonators can be realized by a resistor in series with a phase inverter. Therefore, the calculation of g-factors of a lossy coupling matrix should be modified. In order to synthesize lossy filters with uniform g-factors, an optimization method is proposed for generalized specifications, where the hyperbolic rotation angles are regarded as the...
A new synthesis method is proposed for the design of high-performance parallel connected lossy filters. Compared with the nonuniform Q method, where the Q distribution is determined by the sensitivities of a preset coupling matrix, our method can provide a flat passband with flexible combination of nonuniform Q resonators by utilizing the predistortion technique with an adaptive offset. Two generalized...
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