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THE HAND-HELD RADIO ANTENNA DILEMMA – 4 – •Adding appropriate lengths of radial material at the base of the antenna provides a ground plane for improved radiation pattern and counterpoise for known RF current return path. (C)2016 - NO1PC, JIM ASPINWALL
28 kwi 2023 · Antennas made up of radiating straight sections like Yagis, half-squares, full-wavelength quad loops, etc. also work quite well. Minimize Ground Losses. If you choose a vertically polarized antenna, especially a quarter-wave ground-plane design, ground losses can really eat up a lot of signal. Why?
Antenna radiation pattern depending on length and height. In the images below, I hope to clarify how length and antenna height affect the antenna radiation pattern. In many cases, the available space around the house determines the size and height of the antenna.
Antennas radiate (or receive) because electrons are accelerated (or are caused to accelerate) in the antenna’s elements. Radio or electromagnetic waves are both an E- (electric) and H- (magnetic) field. Electrons move parallel to E-fields. Strongest radiation from accelerating electrons linearly (back and forth)
20 kwi 2003 · Following is a series of dipole radiation pattern plots, produced by a popular antenna modeling program. The first plot below shows a dipole at an elevation of two wavelengths above a standard earth ground model. Note the multiple lobes at varying elevation angles above the horizontal.
Antenna for VHF and Above by G3YWX, published by the Radio Society of Great Britain (RSGB) - covers basic antenna designs that work well at short wavelengths through microwaves; ARRL Antenna Classics series - a series of books containing time-tested antenna designs for HF through microwave antennas.
The vertically oriented STL antenna’s -of-8 doughnut shaped radiation pattern figure maximum is in the plane of the loop with -farfield nulls (for small loops) at right angles to the plane of the loop.
