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The gamma match is often used for providing Yagi impedance matching. It is relatively simple to implement. As seen in the figure below, the outer of the coax feeder is connected to the centre of the driven element of the Yagi antenna where the voltage is zero. As a result of the fact that the voltage is zero, the driven element may also be connected directly to a metal boom at this point without any loss of performance. The inner conductor of the coax is then taken to a point further out on the driven element - it is taken to a tap point to provide the correct match. Any inductance is tuned out using the series capacitor. When adjusting the RF antenna design, both the variable capacitor and the point at which the arm contacts the driven element are adjusted. Once a value has been ascertained for the variable capacitor, its value can be measured and a fixed component inserted if required.

"why do not you try to go through this forum better?"

The real antenna

Try to remove those extra lines and you will see the result ...!!!~

,,,these it"s the real antenna...

,,,no,don"t work..!!! ,,,show me the design...!!!

Yes, it's a double parabolic reflector,like the antenna grid.

that's it ,,, see here ....

I can"t open with coreldraw x5 portable....!!!! ,,,put another type of file...ex.*dxf.file,,!!!

,,,okay buddy...

Buddy, I can not open * cdr.file, can you put * dxf.file? this is the antenna,,,?? I should have some dimensions,,,!!!!

You can show me an Ubiquiti PowerBeam Antenna...???

,,,a constructive solution for adaptive lines...

I did not install MS Visio..!!! ,,but what do you want to look at with this file...?

I can not open vsdx.file, it does to put a different file...!!!

,,, acri, it really matters material PCB-substrate ... !!! What is the type of PCB material used by you?

Я думаю, что с дополнительным директором ...!!!

,,,with the reflector size ( 130mm)

... it is not necessarily so...!!!

With this type of MiMo antenna there is no isolation between ports..!!!

,,,EEEEE>>>