Comments on: Friis Free Space Propagation Model https://www.gaussianwaves.com/2013/09/friss-free-space-propagation-model/ Signal Processing for Communication Systems Mon, 23 Nov 2020 05:36:23 +0000 hourly 1 https://wordpress.org/?v=6.7.2 By: Mathuranathan https://www.gaussianwaves.com/2013/09/friss-free-space-propagation-model/#comment-26897 Mon, 27 Oct 2014 02:52:00 +0000 http://www.gaussianwaves.com/?p=3131#comment-26897 In reply to student1.

yes. It is a typo in the latex equation. corrected.

]]> By: student1 https://www.gaussianwaves.com/2013/09/friss-free-space-propagation-model/#comment-26896 Mon, 27 Oct 2014 02:31:00 +0000 http://www.gaussianwaves.com/?p=3131#comment-26896 In the numerical example, in “…=52 + 2 + 15 +…” , where that 2 came from? if it refers to the transmitter antenna gain, I think it should be 25, not 2. Please clarify. Thanks,

]]> By: Mathuranathan https://www.gaussianwaves.com/2013/09/friss-free-space-propagation-model/#comment-26600 Tue, 12 Aug 2014 15:56:00 +0000 http://www.gaussianwaves.com/?p=3131#comment-26600 In reply to 9thIDsgt.

Thanks for the eye opener.

]]> By: 9thIDsgt https://www.gaussianwaves.com/2013/09/friss-free-space-propagation-model/#comment-26598 Tue, 12 Aug 2014 14:09:00 +0000 http://www.gaussianwaves.com/?p=3131#comment-26598 Free space isotropic propagation is governed by the wave equation, which does not predict that propagation loss is a function of frequency. The Friis equation includes a frequency dependence because it defines Antenna gain relative to an isotropic gain of unity.

see:

https://en.wikipedia.org/wiki/Free-space_path_loss

Path loss can be a function of frequecy if the waves are propagating through an a absorbing media but this is not the assumption for the Friis equation.

]]> By: Mathuranathan https://www.gaussianwaves.com/2013/09/friss-free-space-propagation-model/#comment-26553 Fri, 01 Aug 2014 03:31:00 +0000 http://www.gaussianwaves.com/?p=3131#comment-26553 In reply to Red Noise.

Thanks for spotting the mistake. Corrected !!!

]]> By: Red Noise https://www.gaussianwaves.com/2013/09/friss-free-space-propagation-model/#comment-26548 Thu, 31 Jul 2014 11:07:00 +0000 http://www.gaussianwaves.com/?p=3131#comment-26548 I think it’s “Friis”, instead of “Friss”

]]>