Allied Telesis 0.5m, HDF 400
Contents
1. isotropic In the first case the antenna gain is expressed in dBd decibels over dipole while in the latter it is expressed in dBi decibels over isotropic Since a dipole s gain is 2 15 dBi and dB are logarithmic quantities the antenna gain in dBi is equal to the gain in dBd plus 2 15 Loss The attenuation of the cable or device In dB WISP Wireless Internet Service Provider Using high gain antennas is not always a good idea Antennas have on electromagnetic waves the same effect that lenses have on light A high gain antenna does not increase the radiated power but simply concentrates the power fed by the transmitter in a certain area and magnifies the received signal from the same area Therefore choosing the right antenna is very important and largely affects the performances of every wireless network The various antenna types differ from each other in their footprint shape Increasing the gain has the effect of reducing their footprint size An Omni directional antenna concentrates the signal in a 360 belt around it The higher the gain the thinner the belt is The result is a better signal far from the antenna and a signal so low below the antenna that it can be impossible to communicate 44 Wireless Panel and Parabolic antennas have a nearly circular footprint Low gain panels can be used for both short distance point to point and point to multipoint links but can be successfully used for straight roads cov2. Omni 2 5 0 6 0 5 1 5 0 5 1 5 x N plug 3 x N socket 3 x N socket ee x N socket a E a E o E E a a a DA K AA X 2am Id XID XTA 8 x 3 x 8cm O9 X 3A x LSEM DKA X LIN 3 KLAX LR 3l x l2 x Sallin 26 x la x lin O7kg 5lbs 33kg 72Ibs 33kg 72Ibs 14kg 31 Ibs WISP enterprise WISP enterprise WISP enterprise WISP enterprise HotSpot Two antennas on Two antennas on Equipment lightning AP one radio I F one radio I F protection Side View _ _ Ss Side View e _ _ _ _ iIN_ A Side View _ _ _ _ _ Side View Notes Allied Telesis 45
3. N i Wireless Accessories WALL MOUNT SUBCATEGORY FEATURE AT WR4501 AT TQ0001 AT TQ0003 AT TQ0041 AT TQ0045 po CCOO COAX CABLES ENVIRONMENTAL _ In outdoor usage Outdoor Outdoor Outdoor Outdoor Outdoor ANTENNA CABLE TYPE HDF200 HDF200 HDF400 HDF400 ANTENNA GAIN 2 4GHz dBi 5GHz INSERTION LOSS 2 4GHz hat 0 3 1 2 dB 5GHz 2 7 0 5 2 x N plug x N plug CONNECTOR x RP SMA plug x RP SMA plug 2 x N plug 2 x N plug AT WR454 la AT WR4541 a a COMPATIBLE AT WR4542 EQUIPMENT AT WR4561 AT VWWR4562 5 a AT TQ2403 a 18 9 8 9 x Iam 3m mM 5m DIMENSIONS Woe Bex NNi Lengi 74x35 x Sin lft 7 7in 9ft Oin Ift 7 7in 6ft 4 9in Weight 48kg 06lbs 1Okg 22lbs 20kg 44lbs 2kg 26lbs 6kg 1 32lbs IDEAL ENVIRONMENT WISP enterprise WISP enterprise WISP enterprise WISP enterprise WISP enterprise Higher gain or Higher gain or CUSTOMER S NEEDS Wall mount S ven External antenna External antenna directional antenna directional antenna Glossary Gain The only reason for designing and using special antennas is to modify the radiation pattern Infact an antenna works as a lens or a parabolic reflector concentrating the radiated power into a narrow beam and enhancing the received signals like a telescope Therefore the Gain expresses how much the antenna enhances the transmitted and received signals relative to simple radiators like a dipole or a dot shaped one called
4. erage too High gain Panel and Parabolic antennas produce such a small spot that can be deployed only in medium to long distance point to point links A Sector antenna footprint is a horizontal ellipse whose width is usually 30 60 90 or 120 therefore higher gain sector antennas have a vertically thinner footprint while keeping the same horizontal width This allows for using Sector antennas in the central site of a point to multipoint link or for coverage of a certain sector in mobile networks Choosing the right antenna is like choosing the best lighting system between various types of streetlamps and lighthouses You will never choose the latter for lighting a yard QO QO CAT5 CABLES ET AT TQ005 1 AT TQ0053 AT TQ0500 AT TQ0292 AT TQ0592 AT TQ0591 Outdoor CASON x RJ 45 plug x waterproof RJ 45 plug m m a 1Om 32ft 9 6in okg 1 1 0lbs WISP enterprise Outdoor CAS Ome x RJ 45 plug x waterproof RJ 45 plug o E 30m 98ft Slin l 5kg 3 3 I lbs WISP enterprise Achieve IP67 protection level for AT WR4500 equipments Omni Antenna Radiation Lobes Top View Top View p _ LOW GAIN ll IN HIGH GAIN _ _ Panel and Sector Antenna Radiation Lobes 1 A 7 c N N Top View LOW GAIN _ pe Im HIGH GAIN _ m SS ANTENNA RF SPLITTERS SURGE PROTECTOR Outdoor Outdoor Outdoor Outdoor
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