Abstract
The round-corner design of an all symmetric edge-coupled bandpass fllter (BPF) is presented. The manufacturing tolerances and its efiects of frequency shift on the design of the edge-coupled are investigated. Consequently, the round-ended design method is proposed in order to compensate the open-end efiect in the half- wavelength resonator section with the round-ended corners rather than decrementing the lengths in a conventional way, and an experience formula and a corresponding procedure are devised for the design of such fllters. The widths of all the half-wavelength resonators are set equal to avoid discontinuities in the interior of the fllter. The fllter is realized on a ceramic fllled soft substrate with dielectric constant of 6.2. For obtaining the de-embedded measured results at the device plane an in-house customized through-re∞ect-line (TRL) calibration kit is produced. Three kinds of fllters at difierent center frequencies are manufactured, and their measured results are in good agreement with the simulated ones after calibration.
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