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Vertical ZL- Beam Antenna for 430- MHz

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ANTENTOP- 02- 2010, # 014

Vertical ZL- Beam Antenna for 430- MHz

 

Figure 2 J- Antenna

 

Stub provides two antiphased RF voltages at its ends. Dipoles at the ZL- beam fed by antiphased RF voltages. So, it is possible to connect vertical dipoles to the ends of the stub. Phase shift between dipoles should be got by shortening left one and lengthening right one.

To obtain space between the dipoles lambda/8 it

needs just bend each dipole. Figure 3 shows the

ready Vertical ZL- Beam Antenna for 430- MHz.

Antenna. Antenna was made from one length of a

copper wire in diameter 1.7- mm (14- AWG).

 

Figure 3 Vertical ZL- Beam Antenna for 430- MHz

A Diagram of Directivity

B Feeding Points

C Dimensions of the Antenna

My practical measurement showed that

the antenna had one sided lobe (Figure

3, A) and 4- dB gain over a usual half

wave dipole.

 

References

1.

http://www.eham.net/ehamforum/smf/index.php?topic=13700.0

2. www.hamuniverse.com/gi6jpozl-special.pdf

3.

http://www.dxzone.com/catalog/Antennas/J-Pole/

4. http://en.wikipedia.org/wiki/J-pole_antenna

 

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August 2, 2016 10:41

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