Abstract
A compact microstrip bandpass fllter (BPF) with multispurious suppression is presented. The fllter consists of two coupled half-wavelength stepped impedance resonators (SIRs) and tapped input/output (I/O) lines. With tuning the impedance ratio (K) and length ratio (fi) of SIRs, a very wide stopband can be easily achieved. The fllter is designed at 2.4GHz (f0) with a wide stopband to 20GHz (8.16f0) and an average rejection level better than 25dB. This study provides a simple and efiective method to achieve a fllter with very wide stopband and compact circuit size simultaneously. Good agreement between the full-wave electromagnetic (EM) simulation and measurement is compared.
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