Fu-Kwun Hwang
«
Embed this message
on: October 22, 2005, 03:40:54 pm »
Registed user can get files related to this applet for offline access. Problem viewing java? Add http://www.phy.ntnu.edu.tw/ to exception site list If java program did not show up, please download and install latest Java RUN TIME The following applet show the E/B field for circular polarized wave.
The total E/B field is shown as default. You can select which component of E/B field to be shown. But do not turn on too many of them at the same time.
Registed user can get files related to this applet for offline access. Problem viewing java? Add http://www.phy.ntnu.edu.tw/ to exception site list If java program did not show up, please download and install latest Java RUN TIME
Meika Resti
Newbie
Offline
Posts: 3
«
Embed this message
Reply #1 on: April 27, 2010, 09:52:53 am » posted from:Surabaya,Jawa Timur,Indonesia
Hello sir, I'm curious about how the steps to make EM circular polarized wave simulation.Would you like to show it to me?
Thank you,
lookang
«
Embed this message
Reply #2 on: April 27, 2010, 02:04:57 pm » posted from:SINGAPORE,SINGAPORE,SINGAPORE
Hello sir, I'm curious about how the steps to make EM circular polarized wave simulation.Would you like to show it to me?
Thank you,
please download the source code to examine it.
the steps are many and perhaps almost impossible to write down every step clearly.
maybe you should look at the source code and articulate your learning difficulties so that we can understand what you want to learn.
Meika Resti
Newbie
Offline
Posts: 3
«
Embed this message
Reply #3 on: May 23, 2010, 07:08:48 pm » posted from:Surabaya,Jawa Timur,Indonesia
Sir, I have tried to make a EM circular wave, but the magnetic field can not appear as well as the electric field. I've been trying to find fault, but I have not found it.Please help me sir...
There are 1 more attached files. You need to login to acces it!
« Last Edit: May 23, 2010, 07:17:17 pm by Meika Resti »
Fu-Kwun Hwang
«
Embed this message
Reply #4 on: May 23, 2010, 11:32:07 pm » posted from:Taipei,T\'ai-pei,Taiwan
You need to know how to create a linear polarized wave first.
Assume the wave is moving in z direction, and electric field is in x direction (which means that magnetic field is in y direction).
Then
You can download the above simulation. Double click the jar file to run it , right click the mouse and select "open EJS model" to find out how it was created in EJS environment.
Meika Resti
Newbie
Offline
Posts: 3
«
Embed this message
Reply #5 on: May 24, 2010, 09:15:32 am » posted from:Surabaya,Jawa Timur,Indonesia
I know what you mean sir, and I've applied to my file. I've corrected my work, but I have not found my mistake...
I confuse sir...Help me...
Fu-Kwun Hwang
«
Embed this message
Reply #6 on: May 24, 2010, 09:24:39 am » posted from:Taipei,T\'ai-pei,Taiwan
Please upload your ejs source (xml) file and explain what you have done.
j.h.goh
Newbie
Offline
Posts: 2
«
Embed this message
Reply #7 on: October 25, 2010, 04:10:52 pm » posted from:Liverpool,Liverpool,United Kingdom
Hi Sir,
I just want know, if I transmit a EM wave in a circular cavity, is it I will create a circular polarization?
Fu-Kwun Hwang
«
Embed this message
Reply #8 on: October 25, 2010, 05:36:16 pm » posted from:Taipei,T'ai-pei,Taiwan
The answer is No (normally).
Circular wave is due to there is 90 degree phase difference between two polarization waves.
You can create such phase difference if the wave speed is different when electric field is in different direction (different polarization).
i.e. two different refraction index values for different polarization.
You need to understand the meaning of polarization of wave to understand it.
j.h.goh
Newbie
Offline
Posts: 2
«
Embed this message
Reply #9 on: October 25, 2010, 06:30:37 pm » posted from:Liverpool,Liverpool,United Kingdom
Thank you for your reply Sir,
I have another idea, if I using the Vector Network Analyzer (VNA) to sweep the frequencies range in circular cavity, is it will generate a circular polarization?
Because different frequencies will have different wavelength, is this right?
or I could used a loop antenna to propagate the frequencies (from VNA) in the circular cavity, this will make different?
thank for all your helpful answer.
Fu-Kwun Hwang
«
Embed this message
Reply #10 on: October 25, 2010, 09:10:48 pm » posted from:,,Taiwan
Circular polarized wave means two wave with the same frequency but different polarization (Electric field are perpendicular to each other),
and the phase between those two electric field is 90 degree. It is circular polzrized if the amplitude of those two electric field are the same, otherwise, it is ellipse polarized.
lookang
«
Embed this message
Reply #11 on: February 27, 2020, 08:09:05 am » posted from:SINGAPORE,SINGAPORE,SINGAPORE
Dear Prof Hwang,
i would like to add
https://en.wikipedia.org/wiki/Circular_polarization the helical line that joins up all the ends of the E vectors.
the AnalyticCurve3D (EJSS_DRAWING3D.AnalyticCurve) in RED.
could you add it on your source EJS and i will try to study it or alternatively you can also add on my source EJSS?
https://iwant2study.org/ospsg/index.php/618 Thanks!
my initial attempt is
functionX = Ex[0].toFixed(3)+"*cos("+_view._format(omega,"0.000")+"*c)"
functionY = "c"
functionZ = Ez[0].toFixed(3)+"*cos("+_view._format(omega,"0.000")+"*c)"
but the correct formula looks very complex, thought i better check with you, rather than i try to brute force the equations out by myself.
Thanks!
« Last Edit: February 27, 2020, 08:13:12 am by lookang »
to toggle author information(expand message area).
Intensity of reflected s-wave/p-wave
October 16, 2007, 04:37:51 pm
