Spurious Response Suppression in Microstrip Bandpass Filters Using Defected Microstrip Structures

A new technique for suppressing the spurious passband of microstrip bandpass filters using defected microstrip structures is presented. This new defected microstrip structure resonator is realized by etching an open ring in the microstrip line. Due to its bandstop nature, the defected microstrip str...

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Bibliographic Details
Published in:Electromagnetics 2012-10, Vol.32 (7), p.389-400
Main Authors: Fallahzadeh, S., Akbarzadeh, A., Tayarani, M.
Format: Article
Language:English
Subjects:
Banded structure
Bandpass filters
bandstop resonator
defected microstrip structure
Design engineering
Electrical equipment
Electricity distribution
Filters
microstrip bandpass filter
Microstrip lines
Microstructure
Noise levels
Resonators
Retarding
Simulation
spurious suppression
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Summary:A new technique for suppressing the spurious passband of microstrip bandpass filters using defected microstrip structures is presented. This new defected microstrip structure resonator is realized by etching an open ring in the microstrip line. Due to its bandstop nature, the defected microstrip structure resonator can be used in microstrip bandpass filters to eliminate the spurious response. A detailed, fast, and accurate analysis using multiconductor transmission lines, and the method of lines is introduced to design the defected microstrip structure structure. The great advantage of the proposed technique is that the design procedure of the filter does not differ from its conventional counterpart; also, the transmission zeros can be allocated to suppress any unwanted passband. To demonstrate the versatility of the proposed method, simulated and measured results for two typical coupled-line and interdigital bandpass filters are presented. The results reveal that the defected microstrip structure integrated bandpass filters can provide a rejection level exceeding 35 dB in the first spurious passband.
ISSN:0272-6343
1532-527X
DOI:10.1080/02726343.2012.716680