I ran a quick simulation of what I see as a one story house. The RX antenna is at a height of 1 meter. Frequency is 10 MHz and the RX antenna was moved from 1 meter to 40 meters. Ground is average Sommerfield/Norton. The E-field falls roughly 10dB with each doubling of distance beyond 6 meters. The H-field falls roughly 6dB with each doubling of distance beyond 6 meters. This is just a first cut. One could make a real project out of modeling and measuring BPL. Dave Cuthbert Micron Technology
From: [email protected] [mailto:[email protected]]On Behalf Of drcuthbert Sent: Monday, December 15, 2003 10:07 AM To: [email protected]; [email protected] Subject: RE: E-field drop off with distance (1-30MHz) lain, this can be calculated (I can send you the formulas) or simulated with NEC. If you give me dimensions of a "typical" house wiring antenna I can run some simulations and see how the e-field goes. As far as a real test, you can drive some RF into an AC socket and take field strength measurements. One way or the other, when you are >1/2 wavelength from the building you will be in the 1/r region. What to use for a house wiring antenna model? I assume the RF is driven into line and neutral differentially with the neutral eventually connected to earth ground at the power entrance. Radiation will be by common mode current. So, an antenna model could be just a single wire to drive the common mode current on. Dave Cuthbert Micron Technology From: [email protected] [mailto:[email protected]]On Behalf Of PLC Webmaster Sent: Sunday, December 14, 2003 6:04 PM To: [email protected] Subject: E-field drop off with distance (1-30MHz) I am currently researching the radiated emissions from High Frequency Power Line Communications (1-30MHz). I am trying to obtain information on how the e-field typically falls of with distance. I have read books that have made claims that this is anywhere in the rang 1/d to 1/5d. I am trying to make a statistical analysis to explain to those who claim that in the near field it is (1/d^2) which they derive from an infitesimally small dipole. Does anyone know of any papers, experiments or actual EMC compliance measurements in the range 1-30MHz that I could use to make an analysis of the drop off rate. Thanks, Iain
