ON THE ANALYSIS AND DESIGN OF SPURLINE BANDSTOP FILTERS.
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abstract
The parameters of general two-coupled lines and symmetric three-coupled lines in an inhomogeneous medium for the lossless case are obtained. By applying the appropriate port-termination conditions, the chain and impedance matrices of the corresponding spurline bandstop filters have been derived. One-section spurline bandstop filters with their stopbands centered near 33 GHz have been designed and tested. There is excellent agreement between the experimental results and those predicted theoretically.