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loss resistance of a small loop 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: loss resistance of a small loop antenna
Posted: Sun Feb 19, 2006 7:47 pm
 
Captain

Joined: Tue Dec 27, 2005 1:51 pm
Posts: 8
Hi!

What is the formula to calculate the loss resistance of a small loop antenna having a square shape?


 
 
Post subject: Loss Resistance of small loop antennas
Posted: Thu Feb 23, 2006 8:03 am
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
The formula I have is for circular loops, but I understand the important quantity is the perimeter, not the shape.

For a copper wire antenna

Loss Resistance is = 0.000996*SQRT(F)*perimeter/diameter of wire

all dimensions in meters and MHz


nubbage


 
 
Post subject: Loss resistance of a loop antenna
Posted: Thu Feb 23, 2006 8:43 am
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
Caramba

Wrong again. The perimeter and radius should be in feet and inches respectively in the previous posting

nubbage


 
 
Post subject:
Posted: Thu Feb 23, 2006 2:36 pm
 
Captain

Joined: Tue Dec 27, 2005 1:51 pm
Posts: 8
OK, thank you very much


 
 
Post subject:
Posted: Sun Feb 26, 2006 2:39 pm
 
Captain

Joined: Tue Dec 27, 2005 1:51 pm
Posts: 8
And now what is the inductance of a square small loop made of copper wire?


 
 
Post subject: Inductance of a square loop
Posted: Thu Mar 23, 2006 8:46 pm
 
General
User avatar

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

See the book Inductance Calculations by Grover - available through Amazon (surprise!).

Good Luck!
fred


 
 
Post subject: Re: loss resistance of a small loop antenna
Posted: Sun May 14, 2006 11:55 pm
 
Lieutenant

Joined: Mon Apr 24, 2006 10:27 pm
Posts: 1
Whitebird wrote:
Hi!

What is the formula to calculate the loss resistance of a small loop antenna having a square shape?


this can be helpful
http://ww1.microchip.com/downloads/en/A ... 00831b.pdf





Posted  11/12/2012
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