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  dipole  
 

ON5BWE

Multiband Dipole

The Dipole Antenna = The Reference Antenna!
 
My VHF & UHT Portable Dipole using 2 Telescopic Whip

All antenna constructions started from a dipole antenna

 

Basic Info:

Dipole antennas can be made from wires, aluminium tubes, copper tubing any material that conducts electricity.
Radio frequency voltages at the design frequency are applied to dipole antennas at the center, between the two conductors.
They are used alone as antennas, and as the driven elements in other types of antennas that are sometimes slightly modified from an exact half wavelength (λ/2).

 

Parts Used:

Wires
Alu tubes
Isolatos
Cable ties
Balun for HF dipoles

 

Diagram:

dipolediagram
 

Construction:

The half wave dipole antenna consists of a conductive wire or rod that is half the length of the maximum wavelength (λ/2) the antenna is designed to operate at end to end.
The wire or tube is split in the middle, and the two sections are separated by an insulator at the center.
Each wire or tube is connected electrically to a 50 ohm coaxial cable at the ends of the center insulator closest to the middle of the antenna.
This gives 2 identical lengths of the conductor on each side of the center insulator.
The feedline for HF dipoles is connected through a Balun of some kind most of the time.

 

 
 
 
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