| 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. |
| 随便看 |
- nuclear, biological, and chemical environment
- nuclear, biological, and chemical mission area analysis
- nuclear, biological, and chemical officer
- nuclear, biological and chemical protection
- nuclear, biological, and chemical protective cover
- nuclear, biological, and chemical reconnaissance system
- nuclear, biological and chemical status product
- nuclear, biological, and chemical support element
- nuclear, biological, and chemical unmanned ground vehicle system
- nuclear, biological and chemical warfare
- nuclear, biological, and chemical warfare
- nuclear, biological, and chemical warning
- nuclear, biological, and chemical warning and reporting system
- nuclear, biological, and chemical weapons
- nuclear, biological, and chemical weapons of mass destruction
- nuclear, biological and chemical zone control center
- nuclear, biological, chemical
- nuclear, biological, chemical, and directed energy
- oro
- oro-
- oro-anal transit time
- oroantral fistula
- orobanchaceae
- orobanchaceous
- orobanche
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