1996 - 2016
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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Framingham, Mass. / 11-SEP-2015
The Black Oak Group has measured the broadband complex permittivity of air. Maximum excursions over 50 MHz to 500 MHz for the real relative permittivity were +0.016 and -0.016 compared to one (1) and for the conductivity +0.0 and -0.00064 Siemens per meter compared to zero (0). The measurement set-up is particularly well suited for commonly encountered low-loss bulk complex permittivities found in dry wood products for the lumber industry, dry grains and cereals for agriculture and the food industry, sifted homogeneous soils for agriculture and machinable homogeneous dielectric samples around 3 x 3 x 3 inches in size.
About The Black Oak Group
RF / Microwave / EMC consulting to board level for simple geometries with full-wave 3D computer simulation analysis. Founded October 1, 2013 / Sole Proprietorship / Frederick Beihold, M.Sc. Engineer
Posted September 13, 2015