in this multiport (2 port) antenna how to fix the excitation of port 2? FEKO V2023.1

Here, in port 2( near the t shape slot at the bottom) I am getting about 0dB reflection, Can you kindly check this model and fix the excitation of feed 2?

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v2023.1

Accepted answers

Jaehoon

Hello @sswh2,

I checked your model with 2024 version and found out the followings.

There is no physical connection problem of the wire port in your model. (I checked the currents, too.)
Please know that when one voltage source is active, the wire port of the other voltage source works as a shoring pin. (The internal resistance of the voltage source is zero.)
You can simplify the radiator part from 3D region to 2D face to save the computational resource. (Please delete the top and side conductor plates.)
When debugging the model, I think "linear spaced discrete points" as the Frequency setting is more effective than "continuous range".

Best regards,

Jaehoon

Torben Voigt

Hi @sswh2 ,

I agree with @Jaehoon and would also use a simplified radiator; see the attached model. Note: The wires are probably too thick. If they really need to be that thick, I would recommend cylinders.

feko-blog-two-port_simplified.cfx

Best regards,
Torben

Jaehoon

You can easily delete the voltage source added to the port 2,

and add a load (of any impedance, under source/load tab) to the port 2.

Please do not delete the wireport2…

Best regards,

Jaehoon

All comments

Jaehoon

Hello @sswh2,

I checked your model with 2024 version and found out the followings.

There is no physical connection problem of the wire port in your model. (I checked the currents, too.)
Please know that when one voltage source is active, the wire port of the other voltage source works as a shoring pin. (The internal resistance of the voltage source is zero.)
You can simplify the radiator part from 3D region to 2D face to save the computational resource. (Please delete the top and side conductor plates.)
When debugging the model, I think "linear spaced discrete points" as the Frequency setting is more effective than "continuous range".

Best regards,

Jaehoon

sswh2

Sir, thanks for making sure the connections are correct in this feeding.

Torben Voigt

Hi @sswh2 ,

I agree with @Jaehoon and would also use a simplified radiator; see the attached model. Note: The wires are probably too thick. If they really need to be that thick, I would recommend cylinders.

feko-blog-two-port_simplified.cfx

Best regards,
Torben

sswh2

Thanks sir, @Torben Voigt .

sswh2

@Torben Voigt sir and @Jaehoon sir

Instead of having two ports, if I want to place a resistive load at the port 2 location, then can you kindly send me the model on how to do that in FEKO with my design?

Jaehoon

You can easily delete the voltage source added to the port 2,

and add a load (of any impedance, under source/load tab) to the port 2.

Please do not delete the wireport2…

Best regards,

Jaehoon

sswh2

Thank you!