Visit Thanks for visiting Thanks for visiting the RF Cafe Archives Thank you for visiting RF Cafe Thank you for visiting the RF Cafe Archives!

High Frequency/High Perm CP 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

 Post subject: High Frequency/High Perm CP antenna
Posted: Mon Nov 06, 2006 12:12 pm 

Joined: Wed Jul 20, 2005 9:59 am
Posts: 1
Hi All,

I am trying to design a CP patch antenna at 24 GHz. The antenna is to be fed by CPW and is EM coupled into the patch on the other side. The substrate that I am using has a high permitivity value of 12.9. I am using HFSS and would consider myself an experienced user so I am confident the of the values of axial ratio I am getting (which is at best about 10dB)

I have tried chopping the corners, alternating the angle of the feed, alternating the type of feed (cap or inductive), putting slots in the patch but all to no avail. Is there something fundamental I am missing that means I can't generate CP with the parameters set out above.



Posted  11/12/2012
RF Stencils for Visio v3.1 by RF Cafe
RF Cascade Workbook 2018 (GS) - RF Cafe
About RF Cafe Archives
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 1996 - 2024
    Kirt Blattenberger,

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website: