Maximally Flat Quarter-Wavelength-Coupled Transmission-Line Filters Using Q Distribution
This paper presents a technique for accurately designing maximally flat quarter-wavelength-coupled transmissionline filters using arbitrary resonant elements. The design procedure currently used, which is based on the lumped-element low-pass prototype, yields a response that is only approximately maximally flat. In addition, the current procedure results in an inaccurate prediction of the total Q for the filter. The technique presented in this paper, herein called the Q-distribution (QD) method, corrects these problems. With the QD method, the designer chooses the number and type of resonant elements and the total Q desired. In turn, the designer is provided with the individual resonator QD, which gives the designer flexibility in selecting the resonator that is most appropriate. © 1997 IEEE.
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