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A 20 Meter Half Square Antenna for QRP
- I've always enjoyed tinkering with wire antennas with the hope of finding a magic configuration that was easy to erect and also made good use of the meager power from my QRP rig
post 07 Jan 2025
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The W8JK antenna design
Invented by Dr. John D. Kraus, W8JK, in 1937, it uses two dipoles, both driven and out of phase with each other, to create a directional antenna no front to back ratio, though that works on six bands 20-17-15-12-10-6 meters and as a top loaded vertical on 40 meters
Using half square antenna for low band
A simple modification to a dipole wouldbe to add two λ/4 vertical wires, one at eachend, this is a half-squareantenna. The antenna can be fed at one cor-ner
Welcome to the Folded Dipole
A variation of the dipole is an antenna called a folded dipole. It radiates like a dipole but sort of looks like a squashed quad
An End Fed Inverted Monoband Vee
An End Fed Inverted Monoband Vee has a low impedance point around 1/4 wave away from ground, and the multiples of 1/4 wave on the feed side
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Invented by Dr. John D. Kraus, W8JK, in 1937, it uses two dipoles, both driven and out of phase with each other, to create a directional antenna no front to back ratio, though that works on six bands 20-17-15-12-10-6 meters and as a top loaded vertical on 40 meters
A simple modification to a dipole wouldbe to add two λ/4 vertical wires, one at eachend, this is a half-squareantenna. The antenna can be fed at one cor-ner
A variation of the dipole is an antenna called a folded dipole. It radiates like a dipole but sort of looks like a squashed quad
An End Fed Inverted Monoband Vee has a low impedance point around 1/4 wave away from ground, and the multiples of 1/4 wave on the feed side
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