Letter | Published:

Non-Linear Transmission Lines for Millimetre Wave Generation and Reception

Naturevolume 192page1064 (1961) | Download Citation



THE properties of non-linear transmission lines, containing, for example, ferroelectric material of the barium titanate class, have been examined, in connexion with a computing system1. Their possible use as a variable capacity parametric amplifier element is obvious, and it has been shown recently that an electromagnetic shock-wave can be propagated2. This effect occurs when a signal of large amplitude is injected into the line. The high-field part of the wave travels at a greater speed than the low-field part so that a sine wave becomes a saw-tooth. After a certain time this has a vertical leading edge analogous to a shock-wave in a gas. Such a wave is rich in harmonics and a number of lines, driven with power derived from the same microwave magnetron and with outputs recombined through phase shifters, could be an efficient harmonic generator.

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  1. 1

    Landauer, R., Proc. Inst. Rad. Eng., 48, 1328 (1960).

  2. 2

    Landauer, R., IBM J., 4, 391 (1960).

  3. 3

    Davis, L., and Rubin, L. G., J. App. Phys., 24, 1194 (1953).

  4. 4

    Powles, J. G., and Jackson, W., Proc. Inst. Elec. Eng., III, 96, 383 (1949).

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  1. Engineering Laboratory, University of Oxford

    • D. WALSH


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