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What does "front-to-back ratio" mean in reference to a Yagi antenna?

The power radiated in the major lobe compared to that in the opposite direction

The term "front-to-back ratio" is specifically used to describe the comparison of the power radiated by a Yagi antenna in its main direction of radiation (the front) versus the power radiated in the direction opposite to that (the back). Essentially, it helps to quantify how much more effectively the antenna directs power in the desired direction than it does in the opposite direction. A high front-to-back ratio indicates that the antenna is performing well at focusing energy forward, thus minimizing unwanted radiation behind it, which is advantageous in communications as it reduces interference from signals coming from that direction. This characteristic is particularly important for applications that require selective communication, as it enhances overall performance by improving signal clarity and reducing noise.

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The total power radiated

The gain compared to a dipole antenna

The overall efficiency of the antenna

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