×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Negative Real part Of input impedance

Negative Real part Of input impedance

Negative Real part Of input impedance

(OP)
Hi

I simulate an inverted patch microstrip antennac using FDTD. the feed structure that I used, was a Gussian Pulse input J-current. Everything is ok. and I almost get good result but the problem is that the real part of input impedance is negative. Can anybody have any comment about that?

tanx

 

RE: Negative Real part Of input impedance

the negative real part of the input impedance is due to the lack of energy absorbing layers.
so you need to incorporate some kind of energy absorbing mechanism(like dielectric loading) in your design.

i had the similar problem when i was simulating my antenna using FDTD based Zeland Software.When i increased the number of perfectly matched layers(PML),i could able to get the real part of the impedance in positive.

all the best.

RE: Negative Real part Of input impedance

Suggestion: Have you tried to increase the antenna thickness?

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! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close