Patch Antenna & HFSS

Hi,

I am new to EM (So to HFSS). I have used FDTD for my initial Patch Antenna simulation so I have some basic concepts. Now I need to do a fast start in HFSS.

I will summarize my situation so that it helps your suggestions.

I know how to calculate dimensions for the patch and substrate for my centre freq. Material selection is easy given HFSS has a list sufficient for me. I will eventualy add parasitic patches and play with slots and other BW enhancements to come up with a nice patch element. Finally my solution will be an phased array.

Now when it comes to Simulation & Antenna parameters,

With HFSS I am in short of knowledge in:

1) Solution Type (Which to select?)

2) Port Setup (Which to select When?)

(For a start to model probe feed I am about to use lumped port but eventually it will be feed by microstrip so I understand that I will have to move towards wave port. Any comment on accuracy of the lumped port? I mean will my Impedance BW, Gain, Pattern etc will vary drastically when lumped port is replaced some practical feed in reality? )

I guess I have lot more but I will not overflow here.

Overall If somebody could provide a HFSS design project of a Patch Antenna, I should be able to explore how things are done and base on that.

Thanks,

Soyuz

PS: My apologies for my english

Look at the attachment file, please.

Hi Borich,

It helped a lot. Now I know I am in the right track. Thanks for the doc.

A minor issue though,

I haven't set up my feed as MStrip. Right now its a lumped port right at the edge of my patch and I plan to do optimetrics on moving the feed towards the centre (I can roughly calculate feed location to match 50 Ohm) to see how it impcats my Impedance BW.

Having this scenerio, I was wondering how the size (width) of the rectangle used for the port have impacts my results/simulation? You can see that I am trying to roughly immitiate a probe feed. I will not try to mede a coax as it will not be used for my final design. I can see that for a MStrip I can make the port box as wide as the line width. But for the patch I have taken it 100um where my patch width is 1600 um at the radiating edge.

So any suggestion/rules on the lumped port rectangle size?

Next thing I have in my mind is, how do I know that my Analysis setup to proper enoguh to give near accurate result. What I am trying to say that what are the thing to play with to force a very good (more that default) analysis? For example how can I make the mesh fine enough for rigorous Em filed calculation. I know that I can use "mesh operation" but the help file didn't give me a good understanding on the parameters I can play with.

any good technical material on that?

Thnaks to all for helping out.

Regards,
-- Soyuz

Soyuz said:

.....any good technical material on that?

Click to expand...

OK!
You can look at the next attachment file.
Also, you can visit to Ansoft web-site:
**broken link removed**
and Ansoft ftp-server:
**broken link removed**

Here is a link to a tutorial on simulating a patch antenna using HFSS

https://www.emtalk.com/tut_1.htm