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Mohammed

Replies: 4
Views: 15795

Forum: Questions Related to Antenna Theory   Posted: Thu Apr 08, 2010 10:20 am   Subject: how to explain the s-polar and smith chart of an antenna..:)
On the Smith chart, the closer the curve gets to the center, the better the impedance matching is (to 50 Ohms usually). On the outer circle of the smith chart, all power is reflected so nothing is r ...
Mohammed

Replies: 4
Views: 15795

Forum: Questions Related to Antenna Theory   Posted: Wed Apr 07, 2010 2:00 pm   Subject: how to explain the s-polar and smith chart of an antenna..:)
So for the s parameter polar plot you are plotting s11?

What frequency range are you scanning on the smith chart? My guess is that the start frequency is out of band, you travel closer to the cen ...
Mohammed

Replies: 4
Views: 15795

Forum: Questions Related to Antenna Theory   Posted: Mon Apr 05, 2010 4:04 am   Subject: how to explain the s-polar and smith chart of an antenna..:)
Hello everyone

Im simulating a planar array antenna using CST  but l dont know how to explain the s-polar and smith chart graphs  and how should be my optimum graph  here is the graphs
...
Mohammed

Replies: 8
Views: 22610

Forum: Questions Related to Antenna Theory   Posted: Tue Feb 16, 2010 10:07 am   Subject: Design planar patch antenna using CST MWS .... help plzzzzz
Well, first of all you should be writing the code yourself. If you can't write it yourself, then you don't really know what's going on, and there's no point in regurgitating someone else's work.
...
Mohammed

Replies: 8
Views: 22610

Forum: Questions Related to Antenna Theory   Posted: Mon Feb 15, 2010 3:25 pm   Subject: Design planar patch antenna using CST MWS .... help plzzzzz
Use the equations here:
http://www.antenna-theory.com/arrays/weights/phased.php

Particularly the array factor equation. That's all you really need. See the related pages for weighting methods.
...
Mohammed

Replies: 8
Views: 22610

Forum: Questions Related to Antenna Theory   Posted: Thu Feb 11, 2010 2:40 pm   Subject: Design planar patch antenna using CST MWS .... help plzzzzz
A smart antenna is an adaptively controlled array, so you will need to have some method of independently controlling the array.

The directivity must increase with more elements, because the "e ...
Mohammed

Replies: 8
Views: 22610

Forum: Questions Related to Antenna Theory   Posted: Wed Feb 10, 2010 4:56 am   Subject: Design planar patch antenna using CST MWS .... help plzzzzz
If you feed them all with a single feed, then the design/implementation is simpler. However, you lose the ability to independently control the elements, so you cannot steer the array.

Feeding them ...
Mohammed

Replies: 8
Views: 22610

Forum: Questions Related to Antenna Theory   Posted: Mon Feb 08, 2010 3:03 pm   Subject: Design planar patch antenna using CST MWS .... help plzzzzz
hello everyone ...

l'm doing a design for a planar array for a smart antenna ... l'm using CST program for my design and l need to do a comparison for the function of the antenna when a 2*2, 4*4, ...
Mohammed

Replies: 4
Views: 15896

Forum: Questions Related to Antenna Theory   Posted: Sun Jan 10, 2010 3:44 pm   Subject: help regarding Microstrip patch antenna design ...
hey boss .. l would like to ask u about the simulation program as well.... which the best program to use for my design application ( HFSS or CTS ) ??.... actually l would like to do design a single pa ...
Mohammed

Replies: 4
Views: 15896

Forum: Questions Related to Antenna Theory   Posted: Sat Jan 09, 2010 9:46 am   Subject: help regarding Microstrip patch antenna design ...
acually l got similar result for both the W and L .. but diff. results for impedance ... but since the only result above then 200 is the online one ..it's the best to take ...

But l'm still confus ...
Mohammed

Replies: 4
Views: 15896

Forum: Questions Related to Antenna Theory   Posted: Thu Jan 07, 2010 4:29 pm   Subject: help regarding Microstrip patch antenna design ...
alsallam alikom ....

Dear beloved Engineers ...

l'm doing a hand design for a microstrip single patch antenna and planar patch antenna separately ... but l have some problems ..such as ..

...
Mohammed

Replies: 2
Views: 11780

Forum: Questions Related to Antenna Theory   Posted: Wed Dec 02, 2009 3:23 pm   Subject: Looking for assist ragarding SMART ANTENNA project
Dear Schubert

Firstly thank you for replaying  actually, l got the topic as general and l have to specify the application and the parameters as well as a first draft for my antenna  also, I have ...
Mohammed

Replies: 2
Views: 11780

Forum: Questions Related to Antenna Theory   Posted: Sun Nov 29, 2009 1:02 pm   Subject: Looking for assist ragarding SMART ANTENNA project
hello there ...

l'm doing my final year project and l have to design, develop and implement a smart broadband antenna ... But l dont know how to start my desing and what is the best program to use ...
Topic: SLL
Mohammed

Replies: 4
Views: 14757

Forum: Questions Related to Antenna Theory   Posted: Tue Nov 10, 2009 5:04 am   Subject: SLL
talking about sidelobe level is a bit confusing and the more l read about it the more confusion i got ...

anyhow, what should be my expected sidelobe level for a smart broadband antenna and how wi ...

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