Improved microstrip hairpin-line bandpass filters for spurious response suppression

A. A. Lotfi-Neyestanak; A. Lalbakhsh

doi:10.1049/el.2012.0967

Improved microstrip hairpin-line bandpass filters for spurious response suppression

A. A. Lotfi-Neyestanak^*, A. Lalbakhsh

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

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 30dB for a 1GHz 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.

Original language	English
Pages (from-to)	858-859
Number of pages	2
Journal	Electronics Letters
Volume	48
Issue number	14
DOIs	https://doi.org/10.1049/el.2012.0967
Publication status	Published - 5 Jul 2012
Externally published	Yes

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10.1049/el.2012.0967

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Improved microstrip hairpin-line bandpass filters for spurious response suppression

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