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A novel tap input coupling structure for a narrow bandpass filter using TM010 mode of a microstrip circular-disk resonator

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2 Author(s)
K. S. K. Yeo ; Sch. of Electron. & Electr. Eng., Univ. of Birmingham, UK ; M. J. Lancaster

This paper discusses a new method to couple into the TM010 mode of a microstrip circular-disk resonator. This method can achieve reasonably strong input coupling, which is useful for narrow-band filters with fractional bandwidths of approximately 0.5% and above. A comparison between this newly proposed input coupling structure and the conventional gap input coupling structure will be addressed. A decision threshold for using either the tap input or the conventional gap-coupled input is also explained. Experimental results of a filter fabricated using this novel input coupling structure is also presented

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:50 ,  Issue: 4 )