Robert, While I don't have specific experience with Skycross antennas, the underlying idea is well established -- two different radiation patterns from elements in the same area, i.e.a scheme that creates pattern diversity. This is possible and commercial versions are being driven the need for MIMO in the small devices like mobile phone. s
For MIMO you need multiple "independent" antennas. One approach is to use polarization, vertical and horizontal, but that only gives you 2x2 MIMO. Polarization is what Orthogon did (now the Moto P2P-600). To get more independent antennas, the simple approach is to use space antenna elements apart (ideally by a half wavelength or more). Of course that doesn't work well in a handset, especially at 700 MHz where a half wavelength is >8 inches. But if you can get two different radiation patterns from structures in the same physical space, that also works for MIMO. For an intuitive sense of why, consider: the secondary and tertiary signals a MIMO system is trying to decode are arriving from different directions (because they were created by reflections). If the you can get two or more different antenna patterns by feeding different parts of a complex structure in the same small area, those feeds will behave differently for the different signals, primary, secondary, tertiary, etc. That gives you the "independent" signals you need for the MIMO computations to work. Of course, this is theory. There's usually some major steps from theory to the real world. :) Sorry I have no real world experience here. - Brough Turner Robert West wrote: > Saw this on TowerTalk, had me scratching my head. Anyone familiar with > these antennas or is this the next WiFi+ B.S.? > > http://www.rfdesignline.com/howto/showArticle.jhtml;jsessionid=F1SQHL23DOWTNQE1GHPCKHWATMY32JVN?articleID=222001586 > > Robert West > Just Micro Digital Services Inc > 740-335-7020 > -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
