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The inherent relation between the multistage impedance transformer (MIT) of microwave engineering and the finite impulse response (FIR) digital filter of digital signal processing is determined for the first time. As a kind of FIR filter, window functions are used for MIT design. The design principle is discussed and design formulas given.<<ETX>>
The inherent relation between the window function used in digital signal processing and the tapered transmission line (TTL) of microwave engineering determined for the first time. Some high quality WFs are used for the TTL design. The design principle is given and the design formulas are derived.<<ETX>>
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