DocumentCode :
1249870
Title :
Phase Compensation of Cascaded Conductor-Backed CPW Periodic Cells
Author :
Ma, Kaixue ; Yeo, Kiat Seng ; Ma, Jian-Guo
Author_Institution :
Center for Integrated Circuits & Syst., Nanyang Technol. Univ., Singapore, Singapore
Volume :
2
Issue :
9
fYear :
2012
Firstpage :
1455
Lastpage :
1464
Abstract :
Several unit cells of conductor-backed coplanar waveguides with and without loading using thin-film ceramic technology are investigated. The frequency-dependent lumped equivalent circuit values of the cells are extracted from the full-wave electromagnetic analysis. Slow-wave periodic transmission lines and end-coupling bandpass filters (BPFs) are designed, fabricated, and measured. Size reductions of 23% and 27% for the loaded filters and several times increase of inverter values for the coupling inverters are achieved compared to that for the unloaded ones. A systematic design method by using cell cascading with compensation is proposed for the designs of the lines and filters. It is also demonstrated that “finite ground,” used in conductor-backed coplanar waveguides in the literature, is no longer suitable for the end-coupling BPFs due to the leakages. The leakages of finite ground deteriorate the stopband rejection of filters as much as up to 32 dB compared with that of “via ground”.
Keywords :
band-pass filters; ceramics; coplanar waveguides; equivalent circuits; transmission lines; cascaded conductor-backed CPW periodic cell; conductor-backed coplanar waveguide; coupling inverter; end-coupling bandpass filter; frequency-dependent lumped equivalent circuit; full-wave electromagnetic analysis; loaded filter; phase compensation; slow-wave periodic transmission line; stopband rejection; thin film ceramic technology; Coplanar waveguides; Couplings; Integrated circuit modeling; Inverters; Power transmission lines; Transmission line measurements; Conductor-backed coplanar waveguide; filter; periodic loading; slow-wave; transmission line;
fLanguage :
English
Journal_Title :
Components, Packaging and Manufacturing Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
2156-3950
Type :
jour
DOI :
10.1109/TCPMT.2012.2205250
Filename :
6248177
Link To Document :
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