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Microstrip radial line stubs are analyzed using a planar circuit technique and characterized for design purposes. Experiments performed on various structures are in excellent agreement with the theory.
A recent method of analysis that takes into account fringe effects is applied to 2-port annular structures. It is shown that the filtering properties of the structure can be controlled by varying the ring width and/or the position of the ports. Experiments performed on microstrips are in good agreement with the theoretical results.
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