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Antenna Feed Points?? - 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


rf_sd77
 Post subject: antenna feed points??
Posted: Thu Jun 17, 2004 3:51 pm 
 
Captain

Joined: Fri Jun 11, 2004 2:17 pm
Posts: 5
I was measuring atthe feed point on a printed circuit board antenna and the impedance was supposed to be seeing about 200 ohms for 2.4GHz application. But when I measured it was about 20 ohms (this is from a previous engineer here). I am new to antenna and when I measured the antenna without the feed point, it measures about 180 ohms but as stated above, the with the feed point it is 20 ohms, any insight??


 
   
 
KC2SHO
 Post subject:
Posted: Fri Jun 18, 2004 11:48 am 
 
Captain
 

Joined: Mon Apr 12, 2004 4:50 pm
Posts: 20
Location: South Florida
What instrument are you measuring the impeadance?

_________________
KC2SHO


 
   
 
rf_sd77
 Post subject:
Posted: Fri Jun 18, 2004 12:21 pm 
 
Captain

Joined: Fri Jun 11, 2004 2:17 pm
Posts: 5
I was using a agilent VNA. But I am mistated, it was not the feed point, it was a transmission line to the feed point, sorry for the confusion, I am new to some of the terminology,


 
   
 
Guest
 Post subject: Antenna design books
Posted: Tue Jun 22, 2004 8:13 am 
Hi:

There are a lot of books out with good information on designing and testing patch (printed circuit) antennas, particularly for data communications. You can look at places like Amazon.com.

Kirt has a good list on RF Cafe where (he claims) the ones listed are 4-star rating or above. Of course, ratings can be slewed by biased reviewers, but in general they are probably pretty reliable.


You should check them out. Most are around $120, but get free shipping, and that's a small price to pay for taking the guesswork out of your effort.

Cheers!



Posted  11/12/2012

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