Design of Planer type Comb-Line Bandpass Filter And Design Parameter Extraction Using FE Analysis
In this paper, we present a design procedure of comb-line bandpass filter with asymmetrical coupled-lines, which has small size in comparison with other planar type filters to take full advantage of reducing the size of RF and microwave components. Based on a parallel coupled-line theory, we develop...
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Published in | 2002 32nd European Microwave Conference pp. 1 - 4 |
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Main Authors | , , , , , |
Format | Conference Proceeding |
Language | English |
Published |
IEEE
01.09.2002
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Subjects | |
Online Access | Get full text |
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Summary: | In this paper, we present a design procedure of comb-line bandpass filter with asymmetrical coupled-lines, which has small size in comparison with other planar type filters to take full advantage of reducing the size of RF and microwave components. Based on a parallel coupled-line theory, we develop admittance inverter model for each asymmetric coupled-line pair. By combining equivalent circuits of the coupled-line section, the design formula, which means the J-inverter formula, for the presented filter is derived. Furthermore, a simple approach using 2-D static FE calculations is employed to extract the physical dimensions of asymmetric coupled-line for a comb-line band-pass filter. Fourth order comb-line bandpass filter with a microstrip multiple coupled-lines is designed by the aforementioned method. In addition, the comb-line filter has been simulated with 3-D EM software and fabricated for measurements. Excellent agreement between the simulation and measurement on the design filter shows the validity of the presented design and design-parameter extraction methods. |
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DOI: | 10.1109/EUMA.2002.339202 |