Abstract
A superconducting chirp filter having a dispersive time delay of 26 ns and a 3.4-GHz bandwidth centered at 4.7 GHz has been fabricated using a niobium-on-silicon shielded microstrip technology. Along a 2*1.6 m delay are, unequally spaced microstrip directional couplers ire employed as sampling devices. To achieve an improvement in dispersion and coupler directivity over conventional microstrip, the device uses a superconductive shield mounted at a distance equal to the height of the dielectric on top of the microstrip structure. Structural support of the 70- mu m-thin high-resistivity dielectric is provided by a large-area bond to a glass substrate. >
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