Novel UWB Bandpass Filter Using CPW-to-Microstrip Transition Structure

Tae-Hak LEE  Jung-Woo BAIK  Seongmin PYO  Young-Sik KIM  

IEICE TRANSACTIONS on Electronics   Vol.E92-C    No.12    pp.1545-1547
Publication Date: 2009/12/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E92.C.1545
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
ultra-wideband (UWB),  UWB bandpass filter,  coplanar waveguide-to-microstrip,  transition,  coplanar strip-to-microstrip transition,  

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A novel bandpass filter (BPF) for an ultra-wideband (UWB) system is proposed in this letter. The BPF consists of four coplanar stripline (CPS)-to-microstrip transitions. Each transition is employed for broad electromagnetic (EM) coupling between a short-circuited CPS and an open-circuited microstrip line. The equivalent circuit model of the proposed geometry is derived and utilized in the impedance and mode matching analysis. Measured results show good agreement with the analysis and simulated ones.