PROJECT TITLE :
Improved microstrip hairpin-line bandpass filters for spurious response suppression
A new fractal technique is applied to hair-pin microstrip bandpass filters for the second spurious suppression. The coupled edges of hair-pin microstrip resonators are changed by a replacement fractal to equalise the odd-mode and even-mode part velocities thus that the closest spurious harmonic can be suppressed. Simulated and measured results show that the second spurious level is reduced below 30 dB for a 1 GHz and 25p.c bandwidth bandpass filter. An analysis is presented to point out the consequences of tap point height on fundamental parameters of the filters. As well, the circuit size is reduced by eleven% compared to the conventional filter.
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