front-to-back ratio


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front-to-back ratio

[¦frənt tə ¦bak ′rā·shō]
(electromagnetism)
Ratio of the effectiveness of a directional antenna, loudspeaker, or microphone toward the front and toward the rear.
(solid-state physics)
Ratio of resistance of a crystal to current flowing in the normal direction to current flowing in the opposite direction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The antenna features a Front-to-Back ratio of 20 dB, with Horizontal and Vertical Beamwidth of 40[degrees].
Figure 12 shows the simulated curve of front-to-back ratio versus wg at 3.5 GHz.
Even though the results show a wide beam scanning from -60 to +67 degrees, the beams are characterized by a poor front-to-back ratio and the patterns are not electrically reconfigurable.
The patterns for 40 mm and 60 mm have inferior performances in terms of the front-to-back ratio, and the case with 20 mm has slightly lower directivity.
Kharkovsky, "Metasurface-loaded circularly-polarized slot antenna with high front-to-back ratio," Electronics Letters, Vol.
The simulated gain is from 6 dBi to 9.3 dBi and front-to-back ratio is more than 10 dB.
The realized gains of 8.6 dBi are observed in the director's direction at both frequencies and the front-to-back ratio is 9.7 dB at 1.2 GHz, and 12.6 dB at 1.3 GHz.
The cross polarization is the highest cross polarization value in the -3dB beam, and the front-to-back ratio is the ratio of the radiation value in the broadside and the highest radiation value in the beam of 180 [+ or -] 20[degrees].
The LP53A operates at 5.25 GHz (802.11a), has an RF gain of 5.5 dBi and front-to-back ratio of > 20 dBi.
The antennas boast superior radiation patterns due to their unique reflector design, providing a very small variation of the -3 dB horizontal beam width over the frequency band, as well as a high front-to-back ratio. As with all Allgon antennas, the new broadband line can be used to accommodate most specifications and planning strategies.
The high front-to-back ratio of the antennas means that only two antennas will receive significant power from any single transmitter, unless the transmitter is located very near one antenna boresight.