Lumped Parameter Band-Pass Filter DesignLow Pass Prototype FilterFinding the Filter ComponentsFilter Simulation with Ansoft DesignerSlide 6Some Observations On The ResultsRichards Transformation: Lumped to Distributed Circuit DesignKuroda TransformsELEC 412 - Lecture 14 1 ELEC 412 RF& Microwave EngineeringFall 2004Lecture 14ELEC 412 - Lecture 14 2Lumped Parameter Band-Pass Filter DesignDesign an N=3 band-pass maximally flat (Butterworth) filter with a center frequency of 900 MHz. The Bandwidth of the filter is 20% ; That is, BW = (0.20)(900 MHz) = 1.8 MHz or 0.9 MHz.From the Maximally Flat Low Pass Prototype Table 5-2, g0 = g4 = 1, g1 = g3 = 1, g2 = 2ELEC 412 - Lecture 14 3Low Pass Prototype FilterWhere the normalized center frequency is c = 1, L = 1.1(2·900 MHz), and U = 0.9(2·900 MHz) So that U - L = 1.13Grad/s and Grad/s627.5ULoELEC 412 - Lecture 14 4Finding the Filter Components nH4450131LUgLLpF713.05011231gCCoLUnH892.050222gLoLUpF2.3550122LUgCELEC 412 - Lecture 14 5Filter Simulation with Ansoft DesignerELEC 412 - Lecture 14 6Filter Simulation with Ansoft DesignerELEC 412 - Lecture 14 7Some Observations On The Results•Values of components are unreasonable•Some other method for implementing the filter design goals must be found•Solution: Use distributed filters using waveguides•Richardson Transforms and Kuroda’s IdentitiesELEC 412 - Lecture 14 8Richards Transformation: Lumped to Distributed Circuit DesignjXLjBCLCl/ 8 at cl/ 8 at cZo = 1/(j C)Zo = j LELEC 412 - Lecture 14 9Kuroda
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