Thank you for visiting RF Cafe! 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 RF Cafe Homepage Thank you for visiting RF Cafe!

How to Test a Directional Couplers? - 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


rakesh_aarya
 Post subject: How to test a directional couplers?
Posted: Tue Jun 16, 2009 12:39 pm 
 
Lieutenant

Joined: Tue Jun 16, 2009 12:25 pm
Posts: 4
Can anybody tell me how to test a directional coupler using vector network analyser...
I dont have specifications for the the directional coupler...the components are pretty old ....I need to get the specification using Vector network analyser...

thanks

cheers
Rakesh


 
   
 
nubbage
 Post subject: Re: How to test a directional couplers?
Posted: Wed Jun 17, 2009 3:04 am 
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 268
Location: London UK
Hi Rakesh
The approach to testing depends on the configuration of the DUT:
is it coaxial or waveguide or stripline?
is the isolated port internally terminated?
or is there an external load with access to the isolated port?

_________________
At bottom, life is all about
Sucking in and blowing out.


 
   
 
rakesh_aarya
 Post subject: Re: How to test a directional couplers?
Posted: Tue Jun 23, 2009 11:52 am 
 
Lieutenant

Joined: Tue Jun 16, 2009 12:25 pm
Posts: 4
The problem is that the directional couplers that i have is from manufacture named ANZAC electronics. it was closed in 1960's.I dont have any datasheets for it... I need to find all the characteristics including the frequency range,etc..
I have a two port VNA by agilent technologies ...
can u tell for both kind of Dc.. The islolated port is terminated internally...

thanks
rakesh


 
   
 
nubbage
 Post subject: Re: How to test a directional couplers?
Posted: Wed Jun 24, 2009 2:48 am 
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 268
Location: London UK
Hi Rakesh
I see Kirt has given you a very comprehensive answer under "components".
Not much to add to that. I guess the coupler of 1960s vintage has N type connectors, which at that time maxed out at 6 or 7GHz, so that probably sets a top limit to the frequency range. Above 7GHz the N-type connector starts to launch waveguide modes and the Reflexion Coefficient vs frequency becomes erratic (although today technology has improved that to around 12GHz).
The only point to be careful about then is obtain a good quality APC-7 to N type transition for at least 2 of the 3 exposed ports of the coupler.
Good luck with that.

_________________
At bottom, life is all about
Sucking in and blowing out.




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