Abstract
A novel frequency tripler using a composite right/left-handed transmission line is proposed. The left-handed transmission line (LH TL) in the proposed frequency tripler suppresses the fundamental component (f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> ), while the composite right/left-handed transmission line (CRLH TL) λ/4 open stub diminishes unwanted harmonics. Due to the combination of the LH TL and CRLH TL λ/4 open stub, the only desirable multiplied frequency component (3f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> ) is obtained at the output port. For the example of the proposed design, a frequency tripler was designed at 1 GHz as^ and measured. The measured output power at 3f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> was -5.67 dBm when the fundamental input power was 0 dBm.
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