| 单词 |
log-periodic antenna |
| 释义 |
Log-Periodic Antenna
log-periodic antenna[′läg ‚pir·ē¦ad·ik an′ten·ə] (electromagnetism) A broad-band antenna which consists of a sheet of metal with two wedge-shaped cutouts, each with teeth cut into its radii along circular arcs; characteristics are repeated at a number of frequencies that are equally spaced on a logarithmic scale. Log-Periodic Antenna a type of a frequency-independent antenna with periodic repetition of the ratios of the characteristic dimensions of the adjoining components. The repetition obeys a logarithmic law in such a way that the ratio between the wavelength of the electromagnetic oscillations being radiated and the characteristic dimensions of the excited part of the antenna remains virtually constant over a wide frequency range. |
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