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Amotech GPS antenna - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 Post subject: Amotech GPS antenna
Posted: Tue Feb 22, 2011 5:21 am 
 
Lieutenant

Joined: Mon Feb 21, 2011 7:27 pm
Posts: 1
I am using the following antenna to form an array that can radiate two different patterns with appropriate switching.

http://www.amotech.co.kr/__Data/_uploads/antenna/01%20GPS%20Antenna/GPS_Patch_Pin%20Type/Datasheet_YDRA-A25-1575%20(Rev%200).pdf

First mode is called anti-jam mode and we request highest directivity as possible. I am ok with this.

Second mode is normal mode and we want a radiation similar to stand-alone antenna, Which is 5 dB peak gain and 90-100 degree HPBW. Despite all my trials I havent been able to achieve this mode. When I activate one element of the array, gain reduces significantly due to mutual coupling, when I activate two elements, hpbw decreases. Increasing element spacing reduces coupling however axial ratio deteriorates this time. How I can I achieve those two beamform properly?

I am using FEKO and can upload feko files upon request.




Posted  11/12/2012
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