Visit RFCafe.com Thanks for visiting RFCafe.net Thanks for visiting the RF Cafe Archives Thank you for visiting RF Cafe Thank you for visiting the RF Cafe Archives!

Amotech GPS antenna - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues - primarily having to spend time purging garbage posts from the board. At some point I might start the RF Cafe Forums again if the phpBB software gets better at filtering spam.

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

-- Amateur Radio
-- Anecdotes, Gripes & Humor
-- Antennas
-- CAE, CAD, & Software
-- Circuits & Components
-- Employment & Interviews
-- Miscellany
-- Swap Shop
-- Systems
-- Test & Measurement
-- Webmaster

nebelwerfer
 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