×
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

Ground plate thickness of 1GHz monopole antenna

Ground plate thickness of 1GHz monopole antenna

Ground plate thickness of 1GHz monopole antenna

(OP)

Hi,

How do I determine the thickness of the ground plate of a 1GHz monopole antenna?

Thank you.

RE: Ground plate thickness of 1GHz monopole antenna

The thickness of the ground plane is going to be largely irrelevant. Assuming the ground plane is non-ferrous eg copper, brass, aluminium etc, the skin depth is going to limit the usable thickness dramatically. For copper the skin depth is about 9mm at 50Hz. Scale by the square root of frequency. Two decades of frequency gives one decade of resistance change.

9mm @ 50Hz
0.9mm @ 5kHz
90µm @500kHz
9µm @ 50MHz
0.9µm @ 5GHz

2µm @1GHz

Metals other than copper will give the same order of magnitude of skin depth. What you need is a large area of ground plane under the monopole. I would say a radius equal to the monopole height would be a minimum, and maybe 3x the radius would give as much benefit as you could get.

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