Wireless Antenna Fall into Five General Categories
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Types of Wireless Antenna
Wireless antenna fall into five general categories:
Parabolic or Dish
An omnidirectional antenna works equally well in picking up signals from every direction. Omnis make excellent general purpose and mobile antennas. The longer an omnidirectional antenna is, the better performance it will have.
30 – 100 MHz
1:2.5 (in band), 1:3 (at band Extreme)
+1 dBi (avg.)
Mechanical and Environmental
12 Kg (net)
Canvas type bag
Adapter to 1.5-2″ pole
-40oC to +55oC
-40oC to +75oC
Certified to 95% per MIL-STD-810D
Certified to 96 hours per MIL-STD-810D
20 minutes (by 2 trained people on ground level)
4 meters minimum above ground (bottom)
Parabolic or Dish Antenna
A parabolic antenna will give you the greatest range for your signal. The trade-off is that they are more difficult to aim. A parabolic antenna is the obvious choice for a point-to-point fixed wireless installation.
IEEE (Institute of Electrical and Electronic Engineers)
MMDS and DOCSIS+
LMDS and MMDS have adapted the DOCSIS (Data Over Cable Service Interface Specification) from the cable modem world. The version of DOCSIS modified for wireless broadband is known as DOCSIS+.
Data-transport security is accomplished under MMDS by encrypting traffic flows between the broadband wireless modem and the WMTS (Wireless Modem Termination System) located in the base station of the providers network using Triple DES.
DOCSIS+ reduces theft-of-service vulnerabilities under MMDS by requiring that the WMTS enforce encryption, and by employing an authenticated client/server key-management protocol in which the WMTS controls distribution of keying material to broadband wireless modems.
LMDS and MMDS wireless modems utilize the DOCSIS+ key-management protocol to obtain authorization and traffic encryption material from a WMTS, and to support periodic reauthorization and key refresh. The key-management protocol uses X.509 digital certificates, RSA public key encryption, and Triple DES encryption to secure key exchanges between the wireless modem and the WMTS.