theory and/or tools for building a 433 MHz Yagi-Cuda antenna

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chromatik

Joined: 15 Aug 2006
Posts: 43

01 Apr 2009 13:36 Yagi antenna question

Hi all,

I'm searching for theory and/or tools for building a 433 MHz Yagi-Cuda antenna.
I understand the principle of Yagi-Cuda antenna, the use of parasitic elements to increase directivity, I found some informations about it, but without explanations why I should separate each element by this distance, nor this one.

And, by the way, a question: what is the consequence of putting dielectric, instead of simple air, between elements ? Will it change the gain of the antenna ?

I think my question could be answered by reading Yagi-Cuda antenna theory so, if you have technical information, this will be great !

Thanks a lot in advance !
Regards

vfone

Joined: 10 Oct 2001
Posts: 2328
Helped: 327

01 Apr 2009 18:54 Re: Yagi antenna question

First of all the name of the inventors of this antenna are Yagi and Uda.

The distance between elements is related to fractions of the wavelength (of resonant frequency), in this way reflecting or directing the radio waves in a particular direction.

A Yagi antenna always uses a dielectric between elements, whatever this dielectric is: air, epoxi, alumina, etc.

The Er of different dielectric materials will affect the resonant frequency of the driven element, and also the frequency bandwidth and beamwidth angle of the antenna.