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: antenna feed cable pattern perturbation
Posted: Mon Feb 27, 2006 2:33 pm
Joined: Mon Feb 27, 2006 2:18 pm Posts: 1
Does anyone know a scheme to minimize scattering from the feed coax of an antenna under test during gain/pattern measurements? Frequency is 2.4 or 5.8 GHz. The problem is for configurations where the coax cannot be oriented perpendicular to the incident field.
Post subject: Antenna feed scattering
Posted: Thu Mar 23, 2006 8:44 pm
Joined: Wed Feb 22, 2006 3:51 pm Posts: 104
Does it really make sense to make an antenna measurement that has no connection to how the antenna will actually function in the real world??
That said, you might consider the use of RF absorbing material around the cable, to make it appear to have the 377 Ohm impedance of free space.
Good Luck, Fred
Post subject: Antenna Feed cable Pattern Perturbation
Posted: Fri Mar 24, 2006 11:10 am
Joined: Fri Feb 17, 2006 12:07 pm Posts: 218 Location: London UK
This is a fairly old posting, but hopefully not too late.
You could wrap the feeder cable with strips of FM4 ferrite-loaded rubber sheet type FM4 from Feriti.