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Results tagged with antenna-modeling
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user 10565
Use for questions about using antenna modeling software to simulate an antenna system and determine its gain and radiation pattern.
2
votes
Modelling a folded dipole
@pymekrolimus: Below is a clip showing the details of a quick study of a model based on your posts so far. The NEC4.2 engine was used for the calculations.
The results look close to what might be ex …
- 2,940
1
vote
How to model my rooftop vertical on 4NEC2?
RE: This antenna is showing only 30% radiation efficiency. What causes it to be so low? ... Is a radiation efficiency of only 30% the expected result for a radiator slightly less than half its ideal …
- 2,940
3
votes
Does mounting a ground plane antenna upside down change the takeoff angle?
Please see my graphic below.
A λ/2, center-fed dipole has about 0.7 dB more gain than a λ/4 ground plane, but otherwise their v-pol, free-space radiation patterns are very similar.
Whether the verti …
- 2,940
2
votes
Antenna gain vs. radiation efficiency in 4nec2
Recall that:
Antenna system gain (efficiency) includes system r-f losses. If any exists, then a proportional amount of applied power from the transmitter is dissipated as heat in the lossy elements …
- 2,940
1
vote
How to produce a NEC antenna file (and what software to use it with)?
4nec2 software does include a means of generating .NEC input data files. The path to do that is shown in the clip below.
- 2,940
2
votes
Do Far-Field Radiation Patterns/Gains of NEC Software Accurately and Always Show the E-M Fie...
The NEC4.2 analysis below compares the intrinsic fields/gains of the same monopole for the definitions and conditions shown in that graphic.
Note that the monopole having a 10 Ω path connecting it to …
- 2,940
1
vote
How Accurately Does NEC-based Antenna Software Calculate Vertical Monopole Antenna System Ra...
Below is a graphic of a short monograph addressing this issue.
- 2,940