We investigate experimentally the collisions of nonlinear envelope pulses in a left-handed transmission line with regularly spaced Schottky varactors. By measuring the test line, we successfully observed that when two nonlinear envelope pulses traveling in opposite directions collide, two new envelope pulses are developed. These new pulses satisfy the phase-matching condition, and their carrier wave frequencies are the sum of the carrier wave frequencies of the original pulses. This article describes the experimental observations, together with the fundamental properties and numerical performance prospects of the test line.
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