Could someone help me with how to simulate antenna for microwave liver ablation using HFSSv.13 i build the geometry of a spherical portion of liver and tumor and the antenna has to be inserted in the center of the tumor. Should I assign a box as a radiation boundry as the analysis check keep saying that the antenna and tumor overlap..
Any suggestion?? Will be really appreciated!
Dear Eman,
I think the problem is in the boundary dimensions (Air-box) and that's why it is overlapped. So, i suggest you to recheck the dimensions of radiation boundary (Air-box). The radiation boundary should be a quarter-wavelength (~λ/4) long from all surfaces of your antenna
Hello Eman,
You need to duplicate a realistic situation, if the antenna has to be placed inside the tumor, then you need to create a hole to place it, 2 objects can not occupy the same volume.
If you share with me your file, I can review it.
Regards,
Ibrahim
Thank you for your reply! I did created a hole in the tumor and liver phantom However the radiation box dimensions i guess was far larger than the tumor and liver phantom dimensions which made the simulation running very slow... Is it okay if the dimensions of radiation bounry ( airbox) to be small than the tumor-liver dimensions and to cut through them?
One more question, how to create a simulation report for SAR in the tumor volume as the one in the file attached?
Regards,
Eman
The air box needs to enclose the antenna and the tumor. Anything you place outside the airbox will be considered part of the background which is PEC.
If you type SAR in the Help, you should get the procedures.
Regards,
Ibrahim
Hello,
To make a report for SAR, I suggest that you create a plane between the antenna and the area where you want to find out, after the simulation selections the plane and you click right in Field Overlays Plot Fields/Other/ Local_SAR or Average_SAR.
Regards,
Yanet
Thank you for your reply!
Hello Yanet Almaguer: regarding the plane you mentioned, Should I assign the plane as a perfect E as boundary? I want to check a SAR distribution for 2 plane horizontal and vertical plane as attached in the figure above
Thank you for reply!
any suggestions about assigning a wave port as the antenna is fed by a probe coax (solution type is terminal driven) and a message popped up that port is assigned to face which apparently cause an error with the simulation
I am familiar with the lumped port but a few articles recommended terminal driven solution type and a wave port assignment since I'm dealing with a coax fed
any suggestions?
Regards,
Eman.
Hello,
You need to create on the outer edge of the coaxial connector a circle of diameter equal to the lining of coaxial, then when you assign the wave port is located in the circle created by default. You can also look in the HFSS User-Guide in Chapter 5, section 5.3.
Regards,
Yanet
Hello,
I am having a prolem check memory limit in hfss... Dont know what is the problem and the program stops and simulation completed with errors..
Could anyone help me to solve this problem...?
Thanks..
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