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Due to its natural bandwidth, the helix is a slow wave structure (SWS) widely used in the travelling wave tube. Reflections may become a severe problem in the travelling wave amplifier, giving rise to feedback and hence oscillations. In a popularly used method, reflections are measured at the extreme ends of the helix. The helix is sometimes made in many(More)
This article presents a CPW fed capacitive coupled circular shaped monopole antenna. Ground dimensions of the geometry are used to tune the proposed antenna's input impedance (impedance bandwidth). Furthermore, these ground dimensions can be used to make antenna operating either in ultra wideband or multiband mode. Besides these dimensions, the(More)
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