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Based on the new structure, a dual-band stub can be realized using the isolation characteristic of the conductor plane, where the stub can be treated as a combination of two back-to-back microstrip stubs operating at different frequencies.
The developed principles show that the characteristic line impedance of a short-circuited (open-circuited) shunt stub should be high (low).
The proposed open stub is small and does not interfere with the surrounding active modules; therefore, this method is extremely attractive from a practical implementation point of view.
Open accessProceedings ArticleDOI
W. Menzel, F. Hogelsack 
14 Jun 1993
11 Citations
It is shown that, by an appropriate design, open and short-circuited series and shunt stubs covering a wide range of stub impedances can be realized.
According to the presented stub-loaded theory, the first differential-mode resonance can be independently designed by the loaded stubs, while not affecting the second one.
This “modified analytical procedure” was demonstrated to be able to describe the force-displacement response of the T-stub model for both static and dynamic situations with relevant accuracy.
The results show that an ultra-wide stopband is achieved, and a multiple double stub is realized by altering the structure size of the double stub that plays important role in the stopband phenomenon.

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