Wireless Antenna Fall into Five General Categories
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Types of Wireless Antenna
Wireless antenna fall into five general categories:
Omni
Parabolic or Dish
Yagi
Patch
Sector
Omnidirectional Antenna
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.
Specifications:
Electrical
Frequency range
30 – 100 MHz
1:2.5 (in band), 1:3 (at band Extreme)
Power Handling
250 W
Impedance
50 Ohm
+1 dBi (avg.)
Azimuth
Omnidirectional
Polarization
Vertical
Mechanical and Environmental
Length
2.8 meter
Top Diameter
2.7 meter
Weight
12 Kg (net)
Packing
Canvas type bag
Mounting
Adapter to 1.5-2″ pole
Color
Olive Green
Wind Resistance
130 Km/h
Temperature, Operating
-40oC to +55oC
Temperature, Storage
-40oC to +75oC
Connector
N-type (female)
Humidity
Certified to 95% per MIL-STD-810D
Saline Fog
Certified to 96 hours per MIL-STD-810D
Operational
Erection Time
20 minutes (by 2 trained people on ground level)
Recommended Height
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.
MMDS Specifications
Fixed/Mobile
Fixed
Circuit/Packet
Max Bandwidth
10Mb
Range
70 miles
Frequency
2.5Ghz-2.686Ghz
Host Network
None
Definer
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.
MMDS provides