×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Patch Design

Patch Design

Patch Design

(OP)
I'm new to patch antenna design. I'm trying to find out the best software to design 900 MHz F antenna's as well as some rectangular patches in 900 & 2.4G ISM bands.

I downloaded (free) Sonnet and tried a 2.4 GHz patch design with it. It's 37.1x28.9mm with coax feed at 18.5 and 7.1mm. It's on FR4 with er=4.48 and 1.6mm thick. Gnd plane is 100mm square.

After simulation, I see that the return loss peaks at a lower freq (2.38G) than expected (2.44G). So, I start to shave off the "L" length 0.1mm at a time and see the peak moving up. However, magically, at a certain point, this peak jumps about 50MHz even though I'm still shaving in 0.1mm decrements.

Is this a problem with the (free) Sonnet simulator?

How accurate are these simulators? Must I know the intricate details of RF antenna design in order to config the simulation parametrics?

What's the best software to purchase? Right now I'd like to pay minimal ($1K range) because I'm doing just rect patches... but, eventually will start doing smaller form factors and hopefully will have more cash to invest.

Thanks for any help.

RE: Patch Design

Try changing the feed point as well... Most of the time they do have a significant influence on your operating frequency...

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources