Timeline for Dipole Antenna: Electromagnetic Wave
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 20, 2023 at 18:54 | comment | added | Thomas Fritsch | @WilliamGarske I'm not sure what you mean by multiple EM waves. I would say, there is just one EM field $\vec{E}(\vec{r},t)$ and $\vec{B}(\vec{r},t)$, i.e. having a different value at every position $\vec{r}$ and time $t$. This EM wave spreads out from the center into all directions, thus filling all space. There is no need for the concept of multiple EM waves. | |
| Nov 20, 2023 at 18:22 | comment | added | William Garske | I mean one antenna. Are there an infinite number of these EM waves that propagate outward? Specifically, looking at the drawing you made | |
| Nov 20, 2023 at 17:57 | comment | added | Thomas Fritsch | @WilliamGarske Do you mean different EM waves from different antennas? Sure there are. Think of a radio station transmitting at $\lambda=3$ m, and at the same time a cell phone transmitting at $\lambda=0.2$ m. All their transmitted waves superimpose, adding up to one single electromagnetic field. | |
| Nov 20, 2023 at 17:34 | comment | added | William Garske | I now get that $\lambda$ can easily be concluded from this. Are there an infinite number of those EM waves that radiate outward? Like do they all have different amplitudes sometimes being a mile long and other times being a few meters? | |
| Nov 20, 2023 at 17:15 | vote | accept | William Garske | ||
| Nov 20, 2023 at 17:08 | history | answered | Thomas Fritsch | CC BY-SA 4.0 |