Low-reflection bandpass filters with a flat group delay

Recently, low-reflection low-pass RLC filters with a linear phase characteristic have been reported. This paper is an extension of this study on bandpass filters, including their realizations with lumped-element and distributed-parameter networks. A topology particularly suitable for microstrip techniques is proposed. It yields a compact design that enables miniaturization and is easy for manufacturing and tuning. Index Terms--Bandpass filters, impedance matching, linear phase filters.