Groups | Search | Server Info | Login | Register

Groups > comp.dsp > #34441

Re: Wavelength Dependency in RF Propagation?

Show all headers | View raw

Hi Marcel,

Thank you for responding and discussing.

Marcel Mueller <news.5.maazl@spamgourmet.org> writes:

> On 26.05.18 07.40, Randy Yates wrote:
>> I was miffed initially by this statement since, as far as I know, there
>> is nothing inherent in wavelength that impacts how RF waves travel
>> through space.
>
> If you are talking about vacuum then yes. In all other media the
> velocity of propagation depends on the frequency. E.g. water molecules
> in the air interact frequency dependent.

Does the velocity of propagation affect path loss/attenuation? 

>> But I guess this was just a way (a confusing one, IMO) of referring to
>> the wavelength dependency of antenna aperture, as explained nicely
>> in this article on the Friis equation?
>
> The coupling of the antenna to the free space also introduces a
> frequency dependent group delay.

I didn't know that. I can certainly see that group delay impacts the
overall response (namely, the phase response), but it doesn't cause 
attenuatation. 

I was mainly interested in attenutation.

> And last but not least a short distance link has some frequencies with
> poor performance due to eigenvalues of the overall geometry.

I love it! Applying linear algebra to wave propagation! Do you have
a reference (hopefully easy to read)?
-- 
Randy Yates, DSP/Embedded Firmware Developer
Digital Signal Labs
http://www.digitalsignallabs.com

Back to comp.dsp | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

Wavelength Dependency in RF Propagation? Randy Yates <yates@digitalsignallabs.com> - 2018-05-26 01:40 -0400
  Re: Wavelength Dependency in RF Propagation? Marcel Mueller <news.5.maazl@spamgourmet.org> - 2018-05-26 10:12 +0200
    Re: Wavelength Dependency in RF Propagation? Randy Yates <yates@digitalsignallabs.com> - 2018-05-26 14:39 -0400
    Re: Wavelength Dependency in RF Propagation? Les Cargill <lcargill99@comcast.com> - 2018-05-27 13:25 -0500
  Re: Wavelength Dependency in RF Propagation? boB <boB@K7IQ.com> - 2018-05-26 01:27 -0700
  Re: Wavelength Dependency in RF Propagation? theman@ericjacobsen.org (Eric Jacobsen) - 2018-05-26 20:56 +0000
    Re: Wavelength Dependency in RF Propagation? gyansorova@gmail.com - 2018-06-25 11:54 -0700
      Re: Wavelength Dependency in RF Propagation? theman@ericjacobsen.org (Eric Jacobsen) - 2018-06-25 20:59 +0000
        Re: Wavelength Dependency in RF Propagation? makolber@yahoo.com - 2018-06-26 06:16 -0700
  Re: Wavelength Dependency in RF Propagation? spope384@gmail.com (Steve Pope) - 2018-05-26 21:30 +0000

csiph-web