# Loss Resistance of a Small Loop Antenna - RF Cafe Forums

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

Whitebird
 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?

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

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

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

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

Whitebird
 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

Whitebird
 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?

fred47
 Post subject: Inductance of a square loop Posted: Thu Mar 23, 2006 8:46 pm
 General

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

RFdumm
 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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