Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Forums Thank you for visiting RF Cafe!

Gap Between the Microstip Trace and Ground Trace - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


Sujatha Gopinath
Post subject: Gap between the Microstip trace and ground trace
Unread postPosted: Fri Jan 14, 2005 5:27 am

If 'W' is the width of the microstrip line, maintaining a gap of 'W' between the microstrip line and ground trace/plane next to it on the same layer is considered as good RF practice. Am I right on this thumb rule?

If anyone has opinion on this , pl let me know. Let me know even if you agree on it. I am following this thumb rule in the RF board I am making. It will greatly aid in coming out with good board with your valuable opinions.


Top


Guest
Post subject: Microstrip Line width
Unread postPosted: Fri Jan 14, 2005 11:09 am

The rule of thumb is correct but remember it is a rule of thunb. The width is what determines the impedance of the line so I would recommend going on the Microsoft Office Website and downloading there "free" transmission line calculator. I am sure Kirt has a link to the sight. In this way you will know for a fact that you have the proper impedance. Keeping the ground trace a W away from the ground trace is usually adequate but I usually keep it 2W away.


Top


IR
Post subject:
Unread postPosted: Fri Jan 14, 2005 11:39 am

Yes it is a good practice. I did it in my latest board design and will be doing it in the next too.


Top


Kirt Blattenberger
Post subject: Re: Microstrip Line width
Unread postPosted: Fri Jan 14, 2005 12:16 pm
Offline
Site Admin
User avatar

Joined: Sun Aug 03, 2003 2:02 pm
Posts: 308
Location: Erie, PA
Anonymous wrote:
...I would recommend going on the Microsoft Office Website and downloading there "free" transmission line calculator. I am sure Kirt has a link to the sight.



Right you are. There is a link to it (Tx-Line is the applet name) on the Software page (1) and the Calculators page (2), and the direct link to the MWO site is here (3). It is quite a nice program for free!



- Kirt Blattenberger :smt024


Top
Profile

Arool
Post subject:
Unread postPosted: Mon Jan 17, 2005 3:55 am

Please make sure that GND away from the Transmission Line (At least 3 to 4 times of the width due to the GND coupling effects if it is filter / high power applications).


Or make use of Coplanar Waveguide with GND plane, which is very similar to the Microstrip but it has lots of advantages.


Please check Microstrip Vs Coplanar Waveguides (with GND plane)


Posted  11/12/2012

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
Webmaster:
Kirt Blattenberger,
 BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:
 AirplanesAndRockets.com

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !

height-line