Menu

Discussion Forum

New Discussion
Filter

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Negative power flow for dipole in free space?

Posted May 15, 2014, 5:03 p.m. EDT RF & Microwave Engineering 1 Reply

Justin Isaac
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

I am getting a negative power flow in the z-direction (emw.Poavz) at the dipole location. My model is attached. Ignore the nanorods (they've been set to free space). What is going wrong here?

Attachments:

1 Reply Last Post Jun 2, 2014, 2:05 p.m. EDT
Robert Koslover Certified Consultant
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Jun 2, 2014, 2:05 p.m. EDT
The quantity emw.Poavz is derived from the RF fields. You are attempting to evaluate it at the center of your dipole, and whether that is a physically-meaningful location is highly-questionable. Even so, the z-component of the average power flow there should evaluate to zero anyway, since the radiated field of a dipole along the z-axis has a null on the z-axis. I'm guessing that you are merely seeing numerical noise.
The quantity emw.Poavz is derived from the RF fields. You are attempting to evaluate it at the center of your dipole, and whether that is a physically-meaningful location is highly-questionable. Even so, the z-component of the average power flow there should evaluate to zero anyway, since the radiated field of a dipole along the z-axis has a null on the z-axis. I'm guessing that you are merely seeing numerical noise.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content