ARRL

N7TWL

Joined: Sun, Jun 5th 2011, 13:02 Roles: N/A Moderates: N/A

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Yagi Front-to-Back Ratio Aug 4th 2011, 13:51 3 1,972 on 7/8/11

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Yagi Front-to-Back Ratio N7TWL on 7/8/11
Ed, what a great answer! I can now easily visualize the principle. Thank you for your excellent reply.

73,
~todd, KF7QFN
Yagi Front-to-Back Ratio N7TWL on 4/8/11
I am studying for my Extra Class license, and the following question (E9B06) seems to be counter intuitive: "What usually occurs if a Yagi antenna is designed solely for maximum forward gain?" The correct answer is that the front-to-back ratio decreases. I would think that the ratio increases. That is, the difference between the numerator and denominator of the ratio is getting larger. If we define the ratio to be that of signal strength transmitted in a forward direction to that transmitted in a backward direction, then surely as the forward gain increases (and presumably signal strength), the backward signal strength has to be decreasing.

Clearly, I am not understanding something in the way antenna gain works. Some insight here would be greatly appreciated.

Thanks.
Todd
KF7QFN

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