Abstract
A compact ultra-wideband (UWB) bandpass fllter (BPF) with improved harmonic suppression using a modifled coupling structure is presented in this paper. The modifled coupling structure is constructed by taper-connecting two folded open stubs to the traditional parallel-coupled lines, which shows an improved characteristic in harmonic suppression. By integrating the proposed coupling and the stepped-impedance stub loaded resonator (SISLR), a UWB BPF is flnally built and tested. The simulated and measured results are in good agreement with each other, exhibiting good wideband flltering characteristic and improved out-of-band performance.
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