HF Helical Antennas: Theory and Practice

Figure 3 View of the Typical Hand Held Radio and Design of the Helical Antenna

But why, then, there are very little publication on helical antenna? Why are there no clear formulas for calculating shortened helical antennas? In practice, it is occurred that the shortened helical antennas, despite their seemingly simple form, are very ambiguous in the calculations and in the theory of operation. Probably this is the reason why it is hard to find articles devoted to the theoretical analysis of the operation of helical shortened antennas.

Another reason that limits the number of publications about shortened helical antennas is that it is not possible accurately simulate a real shortened helical antenna of short waves using modern available antenna simulating software. This is due to some limitations inherent in these programs. Some old special software made by enthusiast (see References 1) as well has serious limitations.

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