It has been discovered that a trisection bandpass filter with mixed cross-coupling K13has flat group delay if the condition K13= 0 is satisfied, which occurs when magnetic Km and electric |Ke| components of the coupling are equal. It has been proven that the group delay of the filter increases as the values Km= |Ke| increase. The microstrip construction of the trisection delay line filter is proposed. The analysis of this construction has been carried out, which allows controlling the values Km = |Ke| at the zero of cross-coupling. The results of the measurements and the simulation are presented.
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A. V. Zakharov (2017) studied this question.
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