Discussion
What is the front to back ratio of an antenna?
Answer: B
Front to back ratio compares the radiation in the main beam direction with that in the opposite direction, and is quoted in decibels. A Yagi may reach twenty decibels and a reflector far more. Comparison with the largest side lobe is the side lobe level, forward gain referred to input power is simply gain, and the ratio of beamwidths describes the shape of the beam rather than any rejection. A high front to back ratio matters where interference arrives from behind the antenna.
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