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January 2008 [Test & Measurement] Determine Twisted-Line Characteristic Impedance This approach shows how to calculate and measure the characteristic impedance of balanced twisted bifilar transmission lines using a commercial vector network analyzer. ANTONIO ALVES FERREIRA JUNIOR Electronic and Electrotechnical Department National Telecommunications Institute (INATEL), 510 João de Camargo Ave. 37540-000, Santa Rita do Sapucaí, Minas Gerais, Brazil; e-mail: ... March 2007 [Components] Designing Wideband RF Impedance Transformers Impedance matching devices are often used in high-frequency circuits, typically to match the impedance of a device or component to the characteristic impedance of a circuit or system. In some circuits, it is desirable for the impedance matching to achieve multiple-octave frequency coverage accompanied by low insertion loss. To help designers working with impedance transformations, this article explores the design of unbalanced-to-unbalanced (unun) wideband impedance... |
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