900MHz frequency paragraph of directional antenna make

This is a tall gain that makes easily simply directional antenna, classical structure of 8 wood antenna, pursue as follows:

Note: 8 wood invent Japanese this kind of antenna, friend calls 8 wood aerial.

   In the graph linear brace up child with Φ aluminium of 10 ｍ ｍ is in charge of, amount to brace up child with sectional for 10 × the aluminium of 3 ｍ ｍ make. Among them reflector 200 ｍ ｍ , director 130 ｍｍ , amount to brace up child 150 ｍ ｍ .

This antenna is in 800 - the effect is used between 900 MH ｚ best, upper limit but outspread the mobile frequency to the mobile phone paragraph, the effect is passable, gain is sharp after 970 MH ｚ reduce. Floor level can come 780 MH ｚ , the following gain of 750 MH ｚ is reduced quickly.

The amount as to director but according to actual condition make choice of, although be more,had jumped over, but overmuch later gain rises not much, aerial total length increases however many. According to actual measurement, gain of the antenna when 7 director makes an appointment with 10 ｄ B, if 15 ｄ B is made an appointment with when the graph.
 

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