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5 maj 2023 · Two or more dipole antennas a connected to a common feedline. As long as the frequencies and the antenna wires are far enough apart, they will work independently. Two dipoles on a common feedpoint. When the wires are close together, there will be more interaction in the tuning.
Here is a fairly simple and easy to build multi band horizontal fan type dipole that can be constructed for all band operation from 160 meters up thru 6 meters or even higher. In the drawing above, it is shown for just four bands, 80 thru 10. One separate dipole for each band needed.
Random Length Multiband Dipoles You can also enjoy multiband performance without traps, coils, fans or other schemes. Simply cut two equal lengths of stranded copper wire.
classic multiband dipole antenna. Power is fed at the center through a length of 450-ohm windowed ladder line. The ladder line connects to a balun that converts the impedance to a lower value for the antenna tuner. Finally, the tuner connects to the transceiver. ARRL1989 1
Multiband antenna #5 - the "fan" dipole. This is really just the simple dipole but a bunch of them, all using the same center insulator and feed line. Yes, you just cut wire dipoles for each band you wish to operate (40 and 15 can use the same one), attach them all to the center insulator and feed line and scurry from band to band with ease.
The Kelemen multiband dipoles are dipole antennas that try to achieve a reasonable compromise between length and available bands. In addition, the weight should be kept as low as possible due to the blocking circuits (traps), while still achieving good durability and robustness.
Band. Frequency. Length. The elevation plots on the right show that the lower we place a dipole, the higher the angle of radiation, a fact that limits our effective range of communications under normal propagation conditions.
