Is there any advantage offered by using a tapered microstrip line for a patch antenna instead of a regular straight one?? Will it any way help in UWB applications?
50 years ago long tapers were used, to get a broadband impedance change, for example. Nowadays broadband components can be achieved with short stepped lines or short tapers - they become very similar as the steps get shorter. You need prediction and optimisation code to design the shortest, low-loss components with short tapers or combinations of steps.
Tapered line is mainly used to match the impedance, as a result of that, BW will obviously increased due to proper matching. Now, if you design the tapered line as radiating line (say, for example, travelling wave antenna type line) at some frequency which is related to your interested frequency band, it will add up to your designed antenna. As a result of that, effective BW will be increased.
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