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 comentional gap input coupling structure will be addressed. A decision threshold for using either the top 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.
|Number of pages||3|
|Journal||IEEE Transactions on Microwave Theory and Techniques|
|Publication status||Published - 1 Apr 2002|
- disk resonator