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How to script to get power(P) by integrating electric field (E) and magnetic field (H) in Coplanar waveguide?

Posted 11 août 2019, 22:04 UTC−4 RF & Microwave Engineering, Wave Optics, Parameters, Variables, & Functions 2 Replies

Om Raj Sapkota
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Dears, I have some query about how to script the formula need to use a calculation of power using the cross product of electric field and magnetic field in the coplanar waveguide? In my case I tried in this way {intop1(-emw.Exemw.Hxt1x-emw.Eyemw.Hyt1y)}; the resulting unit is W/m, but the unit of power is watt (W) only. Note: All the calculation need to do in the RF module in COMSOL So I am requesting all of you can help me to solve this problem?

2 Replies Last Post 23 août 2019, 03:45 UTC−4
Robert Koslover Certified Consultant
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Posted: 6 years ago 16 août 2019, 11:10 UTC−4
Updated: 6 years ago 16 août 2019, 11:11 UTC−4
  1. First of all, your equation has errors in the variable names. For z-directed power, you would need to integrate emw.Ex * emw.Hy -emw.Ey * emw.Hx. But assuming you are working in the frequency domain, what you really need to integrate is 0.5 * real(emw.Ex * conj(emw.Hy) -emw.Ey * conj(emw.Hx)).
  2. BUT there is no need for you to do this anyway! Instead, just integrate the value of the Poynting vector in the z-direction. And Comsol provides that quantity for you. Specifically, integrate emw.Poavz over the cross-sectional area (in the xy plane) through which the power flows.
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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
1. First of all, your equation has errors in the variable names. For z-directed power, you would need to integrate emw.Ex * emw.Hy -emw.Ey * emw.Hx. But assuming you are working in the frequency domain, what you really need to integrate is 0.5 * real(emw.Ex * conj(emw.Hy) -emw.Ey * conj(emw.Hx)). 2. BUT there is no need for you to do this anyway! Instead, just integrate the value of the Poynting vector in the z-direction. And Comsol provides that quantity for you. Specifically, integrate emw.Poavz over the cross-sectional area (in the xy plane) through which the power flows.
Om Raj Sapkota
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Posted: 6 years ago 23 août 2019, 03:45 UTC−4

Dear Robert Koslover; I will try using this idea. Actually i did not know about that integrate emw.Poavz and integrate0.5 * real(emw.Ex * conj(emw.Hy) -emw.Ey * conj(emw.Hx)) is same.

Thank you for your valuable suggestion.

Dear Robert Koslover; I will try using this idea. Actually i did not know about that integrate emw.Poavz and integrate0.5 * real(emw.Ex * conj(emw.Hy) -emw.Ey * conj(emw.Hx)) is same. Thank you for your valuable suggestion.

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