•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe™

Sitemap

microstrip antenna - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 Post subject: microstrip antenna
Posted: Wed Jan 04, 2006 7:24 pm 
 
Captain

Joined: Sat Apr 23, 2005 2:09 pm
Posts: 17
Location: Tampa, FL
I heard that microstrip antennas are only good from 100 MHz and up. What's the design limitation for lower frequencies in regards to microstrip antennas?


 
   
 
 Post subject:
Posted: Thu Jan 05, 2006 8:04 pm 
 
Site Admin
User avatar

Joined: Sun Aug 03, 2003 2:02 pm
Posts: 308
Location: Erie, PA
Greetings Qacer:

The frequency limit is governed by the wavelength of your signal(s) in the substrate. A wavelength calculator is available here. Enter your frequency of interest and the dielectric constant of the substrate.

For example, FR4 has a dielectric constant of around 4.5, so the wavelength of 100 MHz in it is about 1.4 meters (55 inches). If you want to implement any passive circuitry that requires a wavelength shift along the line (as is necessary for filters, power splitters, baluns, etc.), very large substrate would be required.

If all you need is a substrate to implement 50 ohm (or other another impedance) transmission lines to interconnect components, then microstrip can be used at any frequency.

_________________
- Kirt Blattenberger :smt024
RF Cafe Progenitor & Webmaster


 
   
 
 Post subject:
Posted: Tue Jan 24, 2006 9:55 am 
an introduction on microstip antenna:

http://www.4shared.com/file/742081/ae5d ... strip.html


 
  
 
 Post subject:
Posted: Tue Jan 24, 2006 12:17 pm 
Thank you all!



Posted  11/12/2012
Custom Search
More than 10,000 searchable pages indexed.

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger... single-handedly redefining what an engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5th MOB: My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website