Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Forums Thank you for visiting RF Cafe!

Antenna Feed Cable Pattern Perturbation - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


dipole
 Post subject: antenna feed cable pattern perturbation
Posted: Mon Feb 27, 2006 2:33 pm 
 
Lieutenant

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.

Thanks

_________________
Dipole


 
   
 
fred47
 Post subject: Antenna feed scattering
Posted: Thu Mar 23, 2006 8:44 pm 
 
General
User avatar

Joined: Wed Feb 22, 2006 3:51 pm
Posts: 104
HI!

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


 
   
 
nubbage
 Post subject: Antenna Feed cable Pattern Perturbation
Posted: Fri Mar 24, 2006 11:10 am 
 
General
User avatar

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.

See www.iskra-feriti.si





Posted  11/12/2012

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
Webmaster:
Kirt Blattenberger,
 BSEE - KB3UON

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:
 AirplanesAndRockets.com

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !

height-line