Theory and Application of Compact Microstrip PBG Cell for Wide Stop-Band Filter

Wenmei ZHANG  Xiaowei SUN  Junfa MAO  

IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.6   pp.1315-1321
Publication Date: 2005/06/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.6.1315
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
microstrip,  photonic band-gap (PBG),  band-stop filter,  periodically loaded structure,  

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Based on the periodical-loaded principle, a new wider stop-band filter is presented. The design equations are provided, the validity of which is proved by the measured results. Compared with loaded stub of length 1/4λg, the improved T-shape stub can change admittance paralleled with microstrip line and widen the band width of the band-stop filter. The size of the filter loaded by one side can be reduced by 2/3. The stop-band filter loaded by one side and two sides are simulated and realized. The filter loaded by two sides can achieve very wide stop-band. In addition, the stop-band of the new type of filter is deep and steep.