Thank you for visiting RF Cafe! 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 RF Cafe Homepage Thank you for visiting RF Cafe!

Converting Inductors and Capacitors to Microstrip - 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


guest
Post subject: converting inductors and capacitors to microstrip
Unread postPosted: Thu Jan 06, 2005 6:03 am

Hello.I need help about microwave office simulation program.I need to draw layout of my circuit and i dont know how to realize the inductors and capacitors with microstrips.For example i used a 10 nH inductor but i could not find which substrate or W, L to use.Any link or formula about this will help me a lot.Thanks....


Top


Guest
Post subject: Inductor Layout
Unread postPosted: Fri Jan 07, 2005 12:10 pm

Most of the closed form equations for spiral inductor are for inductances with no ground plane influence. The influence of a ground plane will lower the inductance due to field restriction. The equation for a square inductor with no ground plane is:

L=0.85*sqrt(A)*N^(5/3)
A=area of the inductor mm^2
N=number of turns

The total lenght of the line in mm is calculated:

Le=N*[8*Ri+d*(4*N-3)]
N=number of turns
Ri=inner radius of inductor in mm

You can use the equation to get a starting point but since microwave office has a layou toll it may be easier to play around with simulator by adjusting the lenght and width and determining the inductance. The inductance is calculated by:

L=1/(2*PI*F*Xc), where Xc is the reactance of the spiral inductor when terminated to ground. You put this equation in microwave office and optimize for the required inductance while placing limits on how wide and spacing between each turn. If you have an EM simulator ( or you can go online and download the free Sonnet Lite em simulator) you should verify the the design since the linear simulator may not be as accurate.


Top


Guest
Post subject:
Unread postPosted: Tue Mar 08, 2005 4:16 pm

can we use ADS for reliazation of inductor into microstips?


Top


Kirt Blattenberger
Post subject:
Unread postPosted: Tue Mar 08, 2005 5:24 pm
Offline
Site Admin
User avatar

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

I'm a little late to the game, but take a look at this page and see if it helps.

http://www.rfcafe.com/references/electr ... onents.htm



- Kirt Blattenberger :smt024


Top
Profile

T
Post subject:
Unread postPosted: Tue Mar 08, 2005 5:33 pm

Hello,

What is the meaning of the angels (Theta) when calculating the distributed elemenets(Capacitors, inductors)? How does it combines with the implementation of the inductor/capacitor?

Thanks,

-T


Top


Kirt Blattenberger
Post subject:
Unread postPosted: Tue Mar 08, 2005 11:39 pm
Offline
Site Admin
User avatar

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

Theta is the electrical length (360 degrees = one wavelength) of the transmission line at the frequency of interest.


- Kirt Blattenberger :smt024


Top
Profile

Guest
Post subject:
Unread postPosted: Wed Mar 09, 2005 11:20 am

Just one additional comment. Because the value of inductance and capacitance is dependent on the electrical length of the line then the effectiveness of using this type of distributive inductance and capacitance will be band limited. Typically, these types of distributed components are only good for 10 to 15% band.


Top


T
Post subject:
Unread postPosted: Wed Mar 09, 2005 3:05 pm

Thanks for your reply Kirt!

What I really don't undersatnd is why these inductors and capacitors are dependent on the wavelength of the transmission line?

Thanks in advance.

- T


Top


Rod
Post subject:
Unread postPosted: Wed Mar 09, 2005 5:06 pm

If you study the Smith Chart it will make sense to you.

90 degree short = open

91-179 degree short = capacitve

180 degree short = short

_____________________________

90 degree open = short

91-179 degree short = inductive

180 degree short = open


Top


MICRO
Post subject: MICROSTRIP
Unread postPosted: Thu Apr 21, 2005 3:12 am

I AM A NEW USER ..CAN U TELL ME HOW REPRESENT CAPACITOR/INDUCTOR VIA MICROSTRIP?WHAT SHOULD B ETEH DESIRED LEGTH /WIDTH IN OR TO GET THE DESIRED CAPACITOR/INDUCTOR?

WHAT ARE PADS IN ADS?


Top


Guest
Post subject:
Unread postPosted: Thu Apr 21, 2005 9:08 am

Read a book!





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