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What type of Ports are used for HFSS S parameter analysis

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hioyo

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Dear Team,

In Ansys HFSS for S parameter extraction what type of Ports are used.

May I know the difference between waveport and lumped port.

Regards

HARI
 

Solution
P
I'm not sure what you mean by "PCB channel"; if you're using microstrip or slotline either would suffice. Generally, waveports are used for external excitations (that come from outside the domain), while lumped ports are used for internal excitations -- although these are somewhat flexible, as well.

Mostly, it is a matter of preference and accuracy to modelling your exact situation.
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From the HFSS "Help" documentation:

Wave Port
Represents the external surface through which a signal enters or exits the geometry. It is effectively a semi-infinite waveguide attached to the model. This waveguide has the same cross-section and material properties as the port. Wave ports are placed on this interface to provide a means to link the model device to the external world.

Lumped Port
Represents an internal surface through which a signal enters or exits the device. It is effectively a lumped element for exciting the device and measuring S-parameters. For designs with only lumped ports or a combination of lumped and circuit ports, the Advanced Solution Setup, Options tab includes an option to use Enhanced low frequency accuracy.
 

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Hi Planar,

Thank you very much.

What I understood from the above definitions is for PCB channel S parameter extraction we need to use Lumped S parameters.

Please correct me if I am wrong.

Regards
HARI
 

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I'm not sure what you mean by "PCB channel"; if you're using microstrip or slotline either would suffice. Generally, waveports are used for external excitations (that come from outside the domain), while lumped ports are used for internal excitations -- although these are somewhat flexible, as well.

Mostly, it is a matter of preference and accuracy to modelling your exact situation.
 

    H

    hioyo

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Hi Plannar,

Thank you very much.

Channel I mean if you are extracting the S parameters of DDR, then the path from processor to DDR.

Regards
HARI
 

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If you're using a differential-mode CPS, I would either use a waveport exciting the differential mode, or a lumped port placed between the two lines.

Good Luck!
 

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    hioyo

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