Timeline for Is half wave the best distance between dipoles in an antenna array?
Current License: CC BY-SA 4.0
16 events
| when toggle format | what | by | license | comment | |
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| Dec 29, 2021 at 13:30 | comment | added | Chuckyy | When I said "best" I meant the highest gain value of the antenna. It is difficult to say in which direction as it is for educational purposes only. Observing on the example of this model of antenna array, I can see that the radiation pattern has an "eight-shape". | |
| Dec 29, 2021 at 13:04 | comment | added | Marcus Müller | I mean, what do you mean when you say "best": best for what? Best in which direction? | |
| Dec 29, 2021 at 13:02 | comment | added | Chuckyy | @MarcusMüller yes, I meant the antenna gain, not energy gain (my bad). How to specify direction? | |
| Dec 29, 2021 at 12:48 | answer | added | SteveSh | timeline score: 2 | |
| Dec 29, 2021 at 12:48 | comment | added | Marcus Müller | @Chuckyy could you define "energy gain"? Energy is a conservative quantity in this universe, so I guess you mean gain in a specific direction, but you don't specify the direction! | |
| Dec 29, 2021 at 12:27 | comment | added | Chuckyy | "You should force the plots to have a fixed 10 dBi outer limit." I have no idea how to do it. Could you please tell which option in 4NEC2 I can do this? If that's not a problem, of course. | |
| Dec 29, 2021 at 12:07 | comment | added | Andy aka | You should force the plots to have a fixed 10 dBi outer limit. It makes them easier to compare. It's up to you. | |
| Dec 29, 2021 at 12:00 | comment | added | Chuckyy | @GrahamNye it is my NEC code to definition current source: EX 6 1 5 0 1 0, maybe it is not correctly? | |
| Dec 29, 2021 at 12:00 | comment | added | Graham Nye | "Both dipoles are supplied with 1 A DC." Are you sure? It seems more likely that the dipoles are supplied with AC at whatever frequency makes them λ/2 long. You should also specify the orientation of the dipoles (which seem to be vertical) and the phasing of the two feeds (which seem to be in phase). Best distance depends on what polar pattern you are trying to achieve. You can also change the polar pattern by introducing a phase shift in the feeds to the two copies. You should get an interesting result for λ/4 spacing by feeding the two dipoles with a 90° phase shift between them. | |
| Dec 29, 2021 at 11:59 | comment | added | Chuckyy | @Andyaka "It would have been far better if you'd have kept the scaling the same on all plots." what do you mean? "You still haven't linked to 4NEC2." I added screenshot Pattern window (F4) from 4NEC2. What can I add to make my post understandable? | |
| Dec 29, 2021 at 11:47 | comment | added | Andy aka | It would have been far better if you'd have kept the scaling the same on all plots. Now, it makes it really hard to differentiate. You still haven't linked to 4NEC2. | |
| Dec 29, 2021 at 11:16 | comment | added | Chuckyy | @Andyaka ok, I edited the post. | |
| Dec 29, 2021 at 11:14 | history | edited | Chuckyy | CC BY-SA 4.0 |
add pictures
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| Dec 29, 2021 at 11:09 | comment | added | Andy aka | A picture would help plus a link to whatever 4NEC2 is. | |
| Dec 29, 2021 at 10:49 | history | edited | JRE | CC BY-SA 4.0 |
deleted 27 characters in body; edited title
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| Dec 29, 2021 at 10:42 | history | asked | Chuckyy | CC BY-SA 4.0 |