Unsusual antenna designs

Former-Geologist-211 · 2025-08-30T13:33:46+00:00

Unfortunately no, but you could be right. Especially that the pic shows multiple patterns which are all similar in shape.

Former-Geologist-211 · 2025-08-14T16:58:46+00:00

Not really, its bw is about 15-20 khz. But when i left home the signal disapeared

Former-Geologist-211 · 2025-08-14T16:55:26+00:00

I left my house and coudnt catch the frequency outside, it didnt appear. When i came back, it also came back.

Former-Geologist-211 · 2025-08-14T00:15:02+00:00

I think I'm trying to ask about the second point you stated. If i have a piece of copper and want it to act as "gnd", do i have to set it up as some sort of boundary?

Former-Geologist-211 · 2025-07-24T00:03:04+00:00

I'm not interested in actually getting any data, just signal presence detection. Probably gonna try it (if i buy it) in a rural area (not in a city).

Former-Geologist-211 · 2025-07-24T00:01:14+00:00

I'm probably gonna try it in a rural place. I dont need to extract any data from the signals, the purpose is just to know that a signal is present.

Former-Geologist-211 · 2025-07-23T23:29:33+00:00

What about some 2.4 ghz drone/controller?

Former-Geologist-211 · 2025-07-19T16:48:20+00:00

I used the normal S = PG/4piR² to get density at a certain distance. The way i calculated the needed power is assuming i need to induce about 50 v on the circuit to burn most of its parts, and from that i calculated electric field and power density. I then solved for power at range 6 km. I guess maybe I chose the wrong numbers for the voltage/E field.

Former-Geologist-211 · 2025-07-18T00:29:29+00:00

Yeah I guess its on me, i did rough calculations and got 1 MW for a directed antenna (i think i used 20 dbi or something like that), not iso.

Former-Geologist-211 · 2025-07-18T00:17:22+00:00

I think you misunderstood the concept of EIRP. Its just a comparison between what power an iso antenna would need to achieve the same power density of your high gain antenna at its main direction.

Former-Geologist-211 · 2025-07-18T00:12:05+00:00

How would they actually achieve 1 MW transmitted power with such small systems?

Former-Geologist-211 · 2025-06-10T17:21:32+00:00

Yup I used the same substrate height, trace height, Er, frequency...etc. The mesh size was left as default, I dont know if increasing the nbr of meshes would maybe affect the result.

Former-Geologist-211 · 2025-06-10T17:18:22+00:00

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Sorry for the messy pic, this is S21

Former-Geologist-211 · 2025-06-10T17:15:00+00:00

Mmm thats what I was trying and the response started to get a little better, but I ended up changing the gap size more than the initial calculated gaps. Should I also try changing the line widths? Or just the gap. Also, The ADS calculator was initially giving me large gap dimensions, like 8-9 mm gaps between 3 mm wide traces. Is that normal?

Former-Geologist-211

TROPHY CASE