circular polarization

[kishorekumar_ms]

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.

 

[ghb]

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

 

[plasma]

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

**broken link removed**
http://www.eng-tips.com/viewthread.cfm?qid=93327&page=9

pl