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50&#8486; antenna - RF Cafe Forums

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: 50&#8486; antenna
Posted: Tue Apr 05, 2005 10:27 am 
Hi everyone!

I need a small and flexible antenna for a transceiver chip in the 868Mhz frequency band.

I've got a PCB layout, with single ended connection to 50Ω antenna.

Is it possible to use a 1/4λ coax-cable (50Ω) as antenna?

Hopefully anyone can give me an answer.

Enno.


 
  
 
 Post subject:
Posted: Wed Apr 06, 2005 8:11 am 
I've got the answer..


 
  
 
 Post subject:
Posted: Wed Apr 06, 2005 8:23 am 
 
Site Admin
User avatar

Joined: Sun Aug 03, 2003 2:02 pm
Posts: 308
Location: Erie, PA
Greetings Mr. Enno:

So, what is your answer?

My guess is that the coax cable cannot be used as an antenna, although I have had a number of times when my cables were so trashy that they leaked enough to radiate rather well. With a well-constructed coaxial cable, the fields are all contained within the cable cross-section and should not radiate at all.

BTW, I deleted the duplicate original post since it appears to have been a mistake.


- Kirt Blattenberger :smt024


 
   
 
 Post subject:
Posted: Fri Apr 08, 2005 6:12 am 
I don't no, what will happen if you use an coax-cable for antenna. Perhaps there will be some radiation, but I think it isn't much.

I only know that a coax-cable mainly be used to connect the print to the antenna and not to replace an antenna.

Enno.




Posted  11/12/2012
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