Publications on Antenna Simulations - another hobby of mine
Most of the following simulations have been performed with computer simulation using EM tools such as NEC-2,
which is available via anonymous ftp
or at the NEC Unofficial home page.
A description of the tools can be found at my site.
You can also obtain further information from the
Applied Computational Electromagnetics Society (ACES).
Tools such as MININEC, NEC, ELNEC etc are derived from common ancestors which use the Method of Moments as a basis.
- Recent Advances to NEC: Applications and Validation
, Dr G. J. Burke, (March 1989) Modern Antenna Design Using Computers and Measurement Application of Antenna Problems of
Military Interest Ankara Turkey October 19-20, 1989. (pdf 3.4MB)
Among other interested findings Burke introduces Relative Communication Efficiency (RCE) and uses this as a measure
for elevated radial systems.
- The Gain of the Axial-Mode Helix Antenna
, Dr D. T. Emerson, Antenna Compendium Volume 4, pp 64-48, 1995, ARRL.
This article is a summary of some 10,000 different models of axial-mode helical antennas by NEC-2.
- ShortVertical Antennas and Ground Systems, Ralph Holland, AmateurRadio, Vol 63 No 10, October 1995, pp 9-13, WIA.
This article describes how an effective ground system can be produced for
a short vertical antenna. The article explores ground losses and elevated sradial systems. A case study is presented for a 3 radial elevated groundplane.
SpiralTop-loading of a Short Vertical , Ralph Holland, AmateurRadio, Vol 63 No 10, October 1995, pp 16-18, WIA.
This article explores how spiral top-loading can be employed to significantly reduce the height of a resonant radiator. Experimental results show howa 1.5m vertical can be resonated between 1.6 and 3.5 MHz! An attempt has
been made to quantify the system losses. When the technique is applied to a 10 m vertical the losses can be reduced to about 3 dB at 3.5 MHz.
- HorizontalAntennas Above Real Ground, Ralph Holland, Amateur Radio, Vol64 No 10, Oct 1996, pp 22- 24, WIA.
This article shows how the impedance of a horizontal dipole is affected by the ground parameters and mounting height. Various plots are provided to show the effect of frequency and ground parameters.
Two tables are provided detailing the r.f. loss resistance in circular copper conductors.
- HorizontalHalf-wave Dipole Above a Counterpoise, Ralph Holland, AmateurRadio, Vol 64 No 11, Nov 1996, pp 12-13, WIA.
This article describes how the efficiency of a dipole can be improved byplacing it above a counterpoise.
An optimimum height and separation is observed which can be used to obtain an improvement of approximately 40%in efficiency. The radiation pattern is also displayed.
- HybridAntennas, Amateur radio, Ralph Holland, Amateur Radio, Vol65 No 1, Jan 1997, pp 10-14, WIA.
This article is a treatise on antennas that use a combination of vertical and horizontal polarisation. There is a comparison table where the pros and cons of a particular configuration can be weighed up against the constructionand location. Radiation patterns, complete with holes, are displayed ina three-dimensional plot and charts are provided showing the feedpoint impedance and total system efficiency for various soils.
- Antenna Visualisation code, Adrian Agogino - Kenneth Harker
This site illustrates a current research project to visualise different antenna characteristics in a useful fashion.
The antenna visualisation software uses NEC2 as the antenna simulation engine.
- Half-Length 80-Meter Vertical Monopoles: the Best Method of LoadingL. B. Cebik, W4RNL, May 1997
This article describes different forms of antenna loading. One form of loading employs up to four wires to form a spiral top-hat.All antennas are modeled over perfect ground.
- A Modeling Perspective on Ground Planes W4RNL,
L. B. Cebik, W4RNL, 6 June 1997.
This article provides good background reading and introduces the reader to the concept of ground.
The importance of various ground attributes are explained and various effects are modeled using computer simulation.The article covers the effect of elevated ground planes.
- Literature about 136kHz and related topics ON7YD,
Antenna Modeling and Notes - W4RNL
My host does not support active counters, but this page has been accessed 12,467 times up to 05 Mar 1999.
You can view my site stats at usage.
Copyright (c), Ralph Holland, 1997 - 2004