Improved microstrip hairpin-line bandpass filters for spurious response suppression
Authors:
- 5 July 2012
- journal article
- research article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 48 (14) , 858-859
Abstract
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 new fractal to equalise the odd-mode and even-mode phase velocities so that the nearest 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 25% bandwidth bandpass filter. An analysis is presented to show the effects of tap point height on fundamental parameters of the filters. In addition, the circuit size is reduced by 11% in comparison to the conventional filter.Keywords
This publication has 5 references indexed in Scilit:
- Microstrip Hairpin Bandpass Filter Using Modified Minkowski Fractal-Shape for Suppression of Second HarmonicIEICE Transactions on Electronics, 2012
- Spurious-Response Suppression in Microstrip Parallel-Coupled Bandpass Filters by Grooved SubstratesIEEE Transactions on Microwave Theory and Techniques, 2008
- Design of Parallel-Coupled Microstrip Filters With Suppression of Spurious Resonances Using Substrate SuspensionIEEE Transactions on Microwave Theory and Techniques, 2004
- Tapped wiggly-coupled technique applied to microstrip bandpass filters for multi-octave spurious suppressionElectronics Letters, 2004
- Microstrip Filters for RF/Microwave Applications2001