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  • CQ Amateur Radio

    ANALOG ADVENTURES

    Oct 01, 2021 5 minutes
    BY ERIC P. NICHOLS, KLAJ

    In our last installment, we spoke of the glories of the Vector Network Analyzer (VNA) and touched on some of the unique insights one might obtain from this wonderful instrument. One of the phenomena that the VNA can help you explore is this thing called antiresonance … and how it can explain why things like end-fed horizontal wire antennas can be such touchy little beasts.

    If you’re really old like me, you probably learned the term antiresonance as a “pre-synonym” of what we now call parallel resonance. While, from a purely mathematical standpoint, antiresonance and parallel resonance are indeed the same, the term antiresonance gives us a special insight when it comes to antennas … at least linear antennas.

    Allow me to steal a diagram) from the , which in turn was stolen from somewhere in the broadcast engineering literature, quite likely the ancient , which is where I first encountered it.

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