Microstrip Hairpin Bandpass Filter Using Modified Minkowski Fractal-Shape for Suppression of Second Harmonic

Ali LALBAKHSH  Abbas Ali LOTFI NEYESTANAK  Mohammad NASER-MOGHADDASI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.3   pp.378-381
Publication Date: 2012/03/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.378
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
microstrip filter,  fractal,  second harmonic suppression,  

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Summary: 
In this paper, a novel microstrip hairpin-line bandpass filter which employs a modified Minkowski fractal shape is proposed. Although conventional hairpin-line filters are popular for RF front ends, they suffer from undesired spurious responses located at the second harmonic, which causes asymmetry in the upper skirt band. By proper design, the second harmonic of fractal filters can be significantly suppressed through the use of fractal shape. To validate this novel geometry, the proposed filters are fabricated and measured. Simulated results are in good agreement with measured results.