Formation of a transmission-line transformer providing a frequency-dependent impedance transformation ratio
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United States of America Patent
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Jan 8, 2002
Grant Date -
N/A
app pub date -
Sep 22, 1999
filing date -
Sep 22, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A transformer for connection between a generator and a load may be formed by connecting n transmission lines together, in series at one end and in parallel at the other end. The transmission lines are configured to each have a characteristic impedance of R.sub.G +L .vertline.Z.sub.L +L (f.sub.0 +L .vertline., where f.sub.0 is the frequency at which each transmission line is one quarter of a wavelength long (quarter-wavelength frequency), .vertline.Z.sub.L (f.sub.0).vertline. is the magnitude of the load impedance at the quarter-wavelength frequency, and R.sub.G is the generator resistance. The transformer exhibits a frequency-dependent impedance transformation ratio, allowing a more efficient impedance match of a generator to a load having a frequency-dependent impedance, such as an antenna.
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