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collinear omni-directional high gain antenna design?

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winglj

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Hi, everyone, I have a question about the omni-directional high gain antenna design.

Basically, the topology I want to use is a series of half-wavelength wires collinear aligned. The connections between them are spring coils. But how can I determine the dimension of the coil in order to make the phase of the half-wavelength section are in-phase?

Any references will be appreciated. Thanks.
 

The inductor should be calculated to change the phase between elements with 90 degrees.

If you are using λ/2 coaxial segments you don’t have to use any inductors between elements.
 

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    winglj

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I have seen this type of antenna referred to as a "Franklin" . That may be of some help.

I have not been particularly impressed with the results of this type of series feed. Hopefully, you will get it working.
 

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    winglj

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