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effect of temperature on antenna radiation pattern

Posted 13 août 2015, 01:51 UTC−4 RF & Microwave Engineering, Heat Transfer & Phase Change Version 4.4 1 Reply

Avinash Gupta
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Hi Everyone.

I have a Dielectric Resonator antenna. I have its radiation pattern and gain. Now I want to set dielectric block temperature to some degrees, say 50degC. And now I want to check its radiation pattern with this 50 degC temperature of dielectric. (How temperature effects on antenna radiation pattern.?) How to solve this in Comsol.? Can someone please help me.? What Physics and Study I should select.?
1 Reply Last Post 14 août 2015, 19:14 UTC−4
Robert Koslover Certified Consultant
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Posted: 9 years ago 14 août 2015, 19:14 UTC−4
Varying the temperature of the antenna is only relevant to the antenna pattern if it affects the material's RF properties and/or geometry of the antenna. Most (not all) materials don't physically deform much at only 50 deg C as compared to room temperature, so most likely, your concern is limited to the RF properties of the dielectric. Thus, you need to find some published data on the RF properties (e.g., the dielectric constant) at the temperature(s) of interest, then simply plug those values into the material properties specified in your RF model.

Note: If, by some chance, this is an extremely narrowband (high Q) antennna, then physical deformation just may dominate, in which case you should simply adjust the geometry appropriately (and maybe the RF properties too). Now, if there is a lot of RF power applied and a resulting temperature variation across the antenna, and if you care about computing the heating and RF properties self-consistently, then you just might have a multi-physics problem after all...
Varying the temperature of the antenna is only relevant to the antenna pattern if it affects the material's RF properties and/or geometry of the antenna. Most (not all) materials don't physically deform much at only 50 deg C as compared to room temperature, so most likely, your concern is limited to the RF properties of the dielectric. Thus, you need to find some published data on the RF properties (e.g., the dielectric constant) at the temperature(s) of interest, then simply plug those values into the material properties specified in your RF model. Note: If, by some chance, this is an extremely narrowband (high Q) antennna, then physical deformation just may dominate, in which case you should simply adjust the geometry appropriately (and maybe the RF properties too). Now, if there is a lot of RF power applied and a resulting temperature variation across the antenna, and if you care about computing the heating and RF properties self-consistently, then you just might have a multi-physics problem after all...

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