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http://dx.doi.org/10.5515/KJKIEES.2011.22.9.904

The Analysis of Dual Resonant Iris for Designing Waveguide Band-Pass Filter  

Choi, Jin-Young (School of Electronics Engineering, IT College, Kyungpook University)
Kim, Byung-Mun (Division of IT Cooperative Systems, Gyeongbuk Provincial College)
Cho, Young-Ki (School of Electronics Engineering, IT College, Kyungpook University)
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Abstract
This paper deals with transmission characteristics of a new dual resonant structure for designing waveguide band-pass filter. The structure which has a pass-band between two adjacent stop-bands in a single body consists of circular ridged aperture and four armed conducting patch. The dual resonant behavior of the structure can be represented by a combination of LC series and parallel resonant circuits. Also these resonant properties can be easily controlled by varying the geometry of the aperture and four armed conducting patch. Actually, the structure is fabricated on the microstrip substrate by use of etching technique so that it is formed an iris type resonator which can be easily put into the transverse plane of the waveguide. We use WR-90 standard waveguide, adapters, and VNA(vector network analyzer) to measure the resonant characteristics of the structure. It is very useful to design and to improve the cutoff skirts characteristics in the waveguide band-pass filter design area.
Keywords
Waveguide Band-Pass Filter; Small Resonant Aperture; LC Resonant Circuit;
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