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Encyclopedia > Travelling wave tube

A TWTA or travelling-wave tube amplifier is an electronic device used to produce high-power radiofrequency signals. The bandwidth of a broadband TWTA can be as high as one octave, although tuned (narrowband) versions exist, and operating frequencies range from 300 MHz to 50 GHz. The voltage gain of the tube can be of the order of 40 decibels.


  Results from FactBites:
 
Patents in Class 315/3.6 (2096 words)
A crossed-field amplifier tube is constructed in which there is substantially no direct RF coupling between the output of the slow-wave structure on the anode and the input of the slow-wave structure of the cathode to thereby obtain a ca...
A coupled cavity travelling wave tube of the space harmonic type is provided wherein the interaction gaps in successive cavities are alternately offset towards the input end of the slow wave structure and towards the output of the slow w...
A traveling wave tube made in accordance with this invention wherein the folded waveguide interaction circuit and the input/output transitions to standard waveguides are made of a single piece of metal such as oxygen-free, high conductiv...
Radar - Wikipedia, the free encyclopedia (4710 words)
A transmitter emits radio waves, which are reflected by the target, and detected by a receiver, typically in the same location as the transmitter.
The use of radio waves to detect "the presence of distant metallic objects via radio waves" was first implemented in 1904 by Christian Hülsmeyer, who demonstrated the feasibility of detecting the presence of ships in dense fog and received a patent for radar as Reichspatent Nr.
Radar waves scatter in a variety of ways depending on the size (wavelength) of the radio wave and the shape of the target.
  More results at FactBites »


 

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