10 ELEMENTS YAGI DIRECTIONAL ANTENNA FOR 23cm

This page describes the antenna I realised toghether with some friends for ATV transmission in the 23cm band. It consists of a simple 10 elements Yagi, completely built in copper, and with the element soldered directly to the central boom.

The dimensions of the antenna have been computed using a software based on the DL6WU design. The software for DOS environment is simple to be used and quite intuitive, therefore you can easily compute dimensions for other frequencies and for boom or elements with different diameters.
In order to check the goodness of the design I did some simulations using the software 4NEC2 by Arie Voors. The main characteristics of the antenna obtained from the simulation are the followings.

Peak gain: 14.1dBi
Front/Back ration : 28.2dB
First secondary lobe : -19.3dB with respect to peak
Main lobe width at -3dB : 36° (H plane) and 40° (V plane)
VSWR at 1242.5 MHz : 1.4:1

The plots of the gain patterns on the horizontal plane, on the vertical plane and a 3D view are reported in the following three pictures. In the fourth picture it is reported the VSWR (and the return-loss) between 1200 and 1300 MHz.

Here below you can find the assembly manual of the antenna, the software to compute the dimensions and the NEC file used for the simulation.
WARNING! In the versione 1.0 of the assembly manual, the length of the balun was wrong. The length (equal to lambda/2) has to be measured from the point where you cut the cable shield, and not from the point where you cut the inner conductor. To have the correct measure, downloand the latest version!

DOWNLOADS
	23cm Yagi Assembly Manual - english version (~1,2MByte)
	23cm Yagi Assembly Manual - italian version (~1,2MByte)
	Antenna Dimensions Computation SW (~80kbyte) This is the SW I used to compute the dimensions of the anntenna. Note that it runs in DOS environment.
	NEC file for the simulation (~1kbyte)