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I am designing a microstrip antenna with microstrip line feed technique, I need the equations for the width and length of the microstrip line feed plz help me
but this pdf does not contain design equations for microstrip feed line. I need the equations for width and length of microstrip line feed. tell me if you have those equations. Thanks for the help
---------- Post added at 15:21 ---------- Previous post was at 15:03 ----------
microstrip feed line can be a simple transmission line...
It's width depends on the output impedance of the RF circuit you are connecting to antenna...
Example: If you are trying connect a circuit of output impedance 100 ohms to antenna (of 50 ohms impedance)...a 100 to 50 ohm transformer need to be used...
you can use APPCAD to design the width of transmission line for various impedances...........
The input impedance of patch is 233 ohms so the impedance of strip line should also be 233 ohms k, but the co-axial cable has impedance of 50 ohms so how to match them without using incept feed
The input impedance of patch is 233 ohms so the impedance of strip line should also be 233 ohms k, but the co-axial cable has impedance of 50 ohms so how to match them without using incept feed
I understand you are using a connector at the end of feed for coupling, am i right?
From the connector you will be haivng a 50-ohm line, i agree, From there you have to design a transmission line which matches to 233ohms on your patch...
You shouldn't match 50 to 233 directly as it may lead to sharp bends leading in reflections...
The transmission line step from the feed to patch can be in following order, 50ohms->100ohms-> 150ohms->200ohms->233ohms
The corresponding widts of tranmission line can be calculated from APPCAD...
can u help me out with appcad as i dont know this software and i have only 20 days remaining to submit the project. Plz it would be of great help to me
APPCAD is a free transmission line calculator tool from AGILENT...
You can calculate the length, width of the Micrstripline/stripline using this tool...
For this you must know the parameters of dielectric and condcutor material...
For a given characteristic impedence, by supplying all the material properties (dielectric constant, conductivity, loss tangent,...)you can calculate the length/width...
---------- Post added at 09:18 ---------- Previous post was at 08:39 ----------
in this case, i suggest to use balun or impedance transformer or taper feed-line
You can use balun but i doubt you can get a balun from 50ohm to 233ohm....you can get 50:200 which needs to be tuned again at the output for 233ohms....
Presently, i don't have it installed, so, i can only give you brief overview but it is very easy to use
Once you open the application,
1. Choose the type of transmission line (for you microstrip).
2. Then enter the charactersitic impedance
3. You must also enter the dielectric properties of the material you are using.
4. After entering all the above and pressing calculate gives you length and width...
I have donwloaded a snap shot of the APP CAD window and attached it here....
in my version of appcad all the unknowns to the left have to be given and all the unknowns on the right are found on the click of the button. so i could not find wo
---------- Post added at 13:20 ---------- Previous post was at 13:18 ----------
my operating frequency is 800Mhz L is somwhere around 9.5cm W is somewhere around 11.5cm height of substrate is 0.1588cm
---------- Post added at 13:21 ---------- Previous post was at 13:20 ----------
its a mini project and is gonna be used for lab purpose
---------- Post added at 13:38 ---------- Previous post was at 13:21 ----------
plz help me in finding Zc and Wo fast as the submissions are on the verge of starting
---------- Post added at 13:39 ---------- Previous post was at 13:38 ----------
how???? do u know the steps?????? if yes then plz help me............................
I hope you have downloaded the APPCAD from the above link....
1. Select the dielectric in the application
2. Enter the frequency
3. Select units as per your convenience
4. Length and width will be some default values when you open the APPCAD....ignore this
5. Press calculate now
6. You will get a certain characteristic impedance.
7. Now adjust the dielectric height 'H' as per your requirement and press calculate.
8. The characteristic impedance gets varied.
9. Also copper thickness 'T' will be very low and enter as per your value and press calculate
10. Charactersitic impedance gets varied.
12. Now adjust width and press calculate check the Zo
13. Repeat above step 9, until you get your desired Zo....
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