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helix waveguide

См. также в других словарях:

  • electron tube — an electronic device that consists, typically, of a sealed glass bulb containing two or more electrodes: used to generate, amplify, and rectify electric oscillations and alternating currents. Also called electronic tube. Cf. gas tube, vacuum tube …   Universalium

  • Traveling-wave tube — A traveling wave tube (TWT) is an electronic device used to amplify radio frequency signals to high power, usually in an electronic assembly known as a traveling wave tube amplifier (TWTA).The bandwidth of a broadband TWT can be as high as three… …   Wikipedia

  • Helical antenna — Helical antennas can operate in one of two principal modes: normal (broadside) mode or axial (or endfire) mode.In the normal mode , the dimensions of the helix are small compared with the wavelength. The far field radiation pattern is similar to… …   Wikipedia

  • Microwave cavity — A microwave cavity is a closed metal structure that confines electromagnetic fields in the microwave region of the spectrum. Such cavities act as resonant circuits with extremely low loss at their frequency of operation. Their Q factor may reach… …   Wikipedia

  • Fractal antenna — A fractal antenna is an antenna that uses a fractal, self similar design to maximize the length, or increase the perimeter (on inside sections or the outer structure), of material that can receive or transmit electromagnetic signals within a… …   Wikipedia

  • Arecibo Observatory — Arecibo Radio Telescope Organization SRI International, NSF, Cornell University Location …   Wikipedia

  • plasma — plasmatic /plaz mat ik/, plasmic, adj. /plaz meuh/, n. 1. Anat., Physiol. the liquid part of blood or lymph, as distinguished from the suspended elements. 2. Cell Biol. cytoplasm. 3. whey. 4. a green, faintly translucent chalcedony. 5. Physics. a …   Universalium

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