On Fri, 31 Jul 2015 14:59:27 +0000, "Pawson, James" <[email protected]> wrote:
> I'm trying to calculate the distances/angles at which a maximum (in phase) or > minimum (anti-phase) signal would occur on an OATS/SAC. ... > Is there a standard equation for calculating the reflection angle on an > OATS/SAC with a varying height antenna? Or can someone give me some pointers > to help me figure it out myself? I was so distracted thinking about this that > I missed my turnoff whilst cycling home the other day. I found Smith's article very helpful: Calculation of Site Attenuation From Antenna Factors, Smith, A.A. et al., http://dx.doi.org/10.1109/TEMC.1982.304041 Calculation of path length is simple: sqrt(R^2 + (h1 - h2)^2) for direct wave and sqrt(R^2 + (h1 + h2)^2) for reflected wave. https://en.wikipedia.org/wiki/Two-ray_ground-reflection_model#/media/File:2-Ray_Ground_Reflection.png I think reflection angle is not important as far as we assume specular reflection on the conductive ground plane. However, at least for vertical polarization, we probably need to consider incident angle to the antennas. Regards, Tom - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
