Transmission line with left-hand characteristics including an interdigital capacitor with partially overlapping fingers
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United States of America Patent
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May 6, 2014
Grant Date -
Feb 18, 2010
app pub date -
Oct 30, 2007
filing date -
Oct 30, 2006
priority date (Note) -
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Abstract
There is herein disclosed an interdigital capacitor, an inductor, and an LH transmission line and a coupler using the interdigital capacitor and the inductor. The interdigital capacitor comprises two finger sets which are substantially disposed in parallel with each other. Fingers of each finger set are overlapped at outer edges thereof with each other to thereby generate capacitance. The inductor is formed substantially spirally inside the transmission line, so that it can have a large inductance in a compact shape and can be used in a broad frequency band. The LH transmission line has a broad frequency band in a compact shape, which includes interdigital capacitors connected in series with each other and inductors connected in parallel with each other. In addition, the coupler employing the LH transmission line has an excellent couplability.
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