front-to-back ratio


Also found in: Wikipedia.

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.
References in periodicals archive ?
RFS UBB technology delivers higher performance gain for better coverage, reduced interference, and excellent front-to-back ratio and performance stability across frequencies.
6 dBi are observed in the director's direction at both frequencies and the front-to-back ratio is 9.
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].
Main challenges of the UWB antenna design for radars include impedance matching, low distortion of pulses, directional patterns, high front-to-back ratio for rejecting false alarms from the movement of the user holding the device, compact size and low cost.
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.
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.
RFS ultra-broadband (UBB) technology delivers higher performance gain for better coverage, reduced interference, and excellent front-to-back ratio and performance stability across frequencies.
Compared with Ref 1, much narrower beam and higher front-to-back ratio can be obtained by the proposed antenna.
Additionally, aperture-coupled patch antennas feature a high front-to-back ratio due to the intermediate ground plane.
Other features include low sidelobe performance, excellent front-to-back ratio, and high level co-located antenna-to-antenna isolation.
To achieve high front-to-back ratio, the slot-loaded and triangle-cut balanced Vivaldi antenna is proposed in Fig.
In this example, the goal was to optimize the variables to achieve a directivity and front-to-back ratio of 8 dB or greater.