Power system harmonics and passive filter designs od Das, J. C. 1934-

The circuits and filters handbook passive, active, and digital filters

Available for University of the Philippines Diliman via Taylor & Francis. Click here to access
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The circuits and filters handbook passive, active, and digital filters

Ridge waveguides and passive microwave components od Helszajn, J. (Joseph)

Available for University of the Philippines Diliman via IET Digital Library. Click here to access
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Advanced electromagnetic analysis of passive and active planar structures od Rozzi, T. (Tullio), Farina, Marco Ph.D

Available for University of the Philippines Diliman via IET Digital Library. Click here to access
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Microwave planar passive circuits and filters od Helszajn, J. (Joseph)

Active and passive analog filter design an introduction od Huelsman, Lawrence P.