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Beacause there is a step in the center conductor, there is a fringing electric field that looks like a capacitance from the center conductor to ground. Because the center conductor current is impeded going from the bigger to the smaller diameter, it acts like a series inductance. So the classic model for such a step in diameter is a shunt capacitor, then a series iinductor, followed by another shunt capacitor. Most microwave analysis programs have the model, or specific model component values for your dimensions can be readily found in the literature.
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