<Li> The ratio of power gain between the front and rear of a directional antenna . </Li> <Li> Ratio of signal strength transmitted in a forward direction to that transmitted in a backward direction . For receiving antennas, the ratio of received - signal strength when the antenna is rotated 180 ° . </Li> <P> The ratio compares the antenna gain in a specified direction, i.e., azimuth, usually that of maximum gain, to the gain in a direction 180 ° from the specified azimuth . A front - to - back ratio is usually expressed in dB . </P> <P> In point - to - point microwave antennas, a "high performance" antenna usually has a higher front to back ratio than other antennas . For example, an unshrouded 38 GHz microwave dish may have a front to back ratio of 64 dB, while the same size reflector equipped with a shroud would have a front to back ratio of 70 dB . Other factors affecting the front to back ratio of a parabolic microwave antenna include the material of the dish and the precision with which the reflector itself was formed . </P>

What is front to back ratio in antenna
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