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kishorekumar_ms
Joined: 12 Nov 2006
Posts: 91
Helped: 1
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 07 Dec 2006 10:55 circular polarization |
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hi frns,
How to confirm the polarization of microstip antenna is whether right handed circular polarization or left handed circular polarization.... i mean by observing which parameters or graghs can we say the type of circular polarization that antenna is radiating...
curiously waiting 4 ur repliesss,
kishore.
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ghb
Joined: 15 Jul 2002
Posts: 99
Helped: 6
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07 Dec 2006 20:23 Re: circular polarization |
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to confirm CP
•using network analyzer
•illuminate with a known cp antenna
•reverse the polarization of this known cp antenna
•compare signal strengths of various polarizations
or go the more diificult route/ time consuming
•record amp & phase of AUT
•generate FF patterns using appropriate techniques
•generate patterns for both LH and RH
•compare patterns
Added after 1 minutes:
also per definition if you have access to the feed points and how those are fed i.e. phase you can easily define CP
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07 Dec 2006 20:23 Ads |
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plasma
Joined: 20 Dec 2001
Posts: 577
Helped: 40
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08 Dec 2006 1:06 Re: circular polarization |
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For the first use spiral antenna well known polarization
look at http://www.cebik.com/amod/amod92.html
next you can rotate linear transmit antenna. you will get sine behavior that
will give you the axial ratio
http://www.andrew.com/products/antennas/esa/articles/axial-ratio.aspx
http://www.eng-tips.com/viewthread.cfm?qid=93327&page=9
pl
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