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| Explicit design formulas are given for symmetrical broader bandwidth parallel diplexers, where the diplexer consists of two bandpass channels connected to a common port, and the two bandpass channels with same band width and operating at different center frequencies are derived from same lowpass prototype. The modified element values of the corresponding lowpass prototypes are expanded as power series in well defined band-separation factors separately, and the input admittances of the both channels are expressed as functions of the modified element values. To keep all zero reflection frequencies of the lowpass prototype as corresponding zero reflection frequencies of the corresponding channel, the coefficients for the power series are determined, and the explicit design formulas are given for all modified element values of the lowpass prototypes of the two channels. Meanwhile, additional impedance invertors are used to obtain a parallel realization. |
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| Keywords:Diplexers, Insertion loss, Network synthese, Filter Design |
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