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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 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.
antenna is not good if it does not radiate enough signal or if it sends the signal off in the wrong direction. Our purpose here is to discuss only those features of radio wave transmission that have some bearing on the installation and maintenance of a high-frequency (HF) antenna system. B. Wavelength and Frequency
The radiation pattern for an antenna is defined on this page. We have 3D graphs of real antenna radiation patterns, with a discussion on isotropic, omnidirectional and directional radiation patterns.
HF radio propagation basics: Understanding the core principles of HF radio waves and ionosphere interactions. Skywave Propagation: How radio waves reflect off the ionosphere for long-distance communication. Solar Effects: Solar phenomena influence radio communications by altering ionosphere behavior.
NOTE 1 – Part 1 to Annex 1 gives comprehensive and detailed information on the theoretical characteristics of HF transmitting antennas. Computer programs have been developed from the theory to calculate the radiation patterns and gain for the various included antenna types.
In the field of antenna design the term radiation pattern (or antenna pattern or far-field pattern) refers to the directional (angular) dependence of the strength of the radio waves from the antenna or other source.
