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- W1990695650 abstract "Manufacturers are under constant pressure to reduce the development time and cost of front-end microwave and millimetre-wave hardware, for both ground and space applications. One of the most expensive components are high-performance filters-due to the associated costs of high-Q materials, any precision assembly and, more significantly, any post-manufacturing tuning. In the context of such filters, considerable effort has resulted in advanced electromagnetic (EM) simulation tools. However, the simulation accuracy that is now available has diverted the problems into the manufacturing process. This is because, in order to draw the full benefits from the increased simulation accuracy, the hardware must now be manufactured with very low tolerances. This, in turn, can significantly increase the cost. Most of the microwave and millimetre-wave band-pass filters currently being designed and manufactured are of the Chebyshev family. This class of filter produces the best out-of-band rejection for an equiripple pass-band response with a, given filter order. For conventional Chebyshev filters, one very important factor for achieving a good filter response is the relative frequency separation of the return-loss zeros. For narrowband high-order filters (e.g. 6th order or higher) the relative frequency separation becomes extremely small and, therefore, a very accurate manufacturing process needs to be employed. Moreover, post-manufacturing techniques need to be used in order to return the filter's response back to the target response. One way to overcome this problem is to address the limitations of the available manufacturing technology and the filter sensitivity to this fabrication process at the initial approximation stage. This can be achieved by emulating the target filter specifications by a transfer function having a slightly higher order but with much lower sensitivity. This results in a new filter family, the Chained Function filters, formed by the product of low-order seed functions. The chained function concept provides a variety of transfer functions to choose from, each one having different characteristics and different implementations requirements. In this paper, chained function filters will be presented. (7 pages)" @default.
- W1990695650 created "2016-06-24" @default.
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- W1990695650 date "2000-01-01" @default.
- W1990695650 modified "2023-09-27" @default.
- W1990695650 title "Application of chained function filters" @default.
- W1990695650 cites W1971130766 @default.
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- W1990695650 doi "https://doi.org/10.1049/ic:20000648" @default.
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