Temporal Properties of Low Power Wireless Links: Modeling and
The ABC of Wireless Links
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Transcript of The ABC of Wireless Links
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The ABC of Wireless Links
Johan FühriBusiness Unit Manager
Poynting Antennas, South Africa
MUM - Brazil 2008
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Overview Basic components of a wireless link Why is the antenna so important
Getting your signal from A to B When stuff goes wrong… Getting it right first time!
To the future… Conclusion
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What is Wireless Link “The wireless telegraph is not difficult
to understand. The ordinary telegraph is like a very long cat. You pull the tail in New York and it meows in Los Angeles. The wireless is the same, only without the cat.” – Albert Einstein.
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Components of a Wireless Link
Radio
Amplifier
Antenna
Antenna
Radio
Amplifier
Wireless
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When stuff goes wrong…
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Why is the antenna important No Antenna = NO WIRELESS LINK! Good antenna = Good link Wrong antenna = Inferior link
Low signal strength More interference
Cheapest way to improve link quality Most effective way to improve link
quality
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How does antennas work? Antenna focuses outgoing and incoming
signals In a particular direction With a particular pattern
More ‘gain’ = more focusing in the firing direction In TX, less signal sent in other directions In RX, antenna is ‘deafer’ in other directions More signal in the firing direction Lower interference
More signal = higher range/data rates
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8 dBi
How does antennas work? More gain = larger size
Panel/dish antennas – gain proportional to area
Limited by physics Size/gain trade-off Must keep losses down
14 dBi 20 dBi
75cm2
300cm2
1200cm2
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What antennas cannot do Antenna ‘bandwidth’
Can’t work over arbitrarily wide number of channels Frequency limited
100-119 120-139 140-159 160-179 180-199http://www.trevormarshall.com/waveguides.htm
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Getting it right first time Choosing the right antenna
Distribution (WISPs) High site CPE
Point-to-Point Indoor Connecting to the Electronics
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Connecting to the Electronics Keep the radio close to the
antenna RF cable kept short Negligible losses – best possible
signal Lower susceptibility to lightning
impulse
Star
t
Fini
sh
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Mounting Electronics Outdoor
POE Injector
Wired network Mains AC
Weatherproof enclosure UV stabilised, shielded ethernet cable
Routerboard platform
Integrated panel antenna
Wireless card Infrastructure location
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Choosing the right antenna Omni-directional antennas – The Ultimate
Solution?
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Choosing the right antenna Sector Antennas
Cover only the areas that you need to cover Multiple sector antennas per enclosure One antenna per radio
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Choosing the right antenna Client Premises Equipment – CPE What is important?
Easy installation Aesthetics Good performance Low cost
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iPoynt
230mm
240mm55mmCompact aesthetic design
IP67 rated, injection-moulded design
Ethernet disconnect cable gland
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MikroPoynt
194mm
134mm
Compact aesthetic design
IP67 rated, injection-moulded design
Water tight cable entry
Pole mount (standard)
Wall mount (standard)
Window mount (standard)
Designed for RB411
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Choosing the right antenna Point-to-Point
High gain dish/panels with heavy duty enclosures (long range)
Fully integrated medium gain solution (medium range)
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Choosing the right antenna High gain antennas
Narrow beamwidth Cutting out noise
High gain Improved signal strength Higher data rates
Grid Antennas Lower wind resistance
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Choosing the right antenna Indoor Antennas
Main problem is Multipath Interference
Space diversity Polarisation diversity
MikroPoynt Dual Polarised coming soon! Relatively low gain antenna – wide
beamwidth Going through walls – unreliable
signal
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Choosing the right antenna - Diversity
WLAN-A0033Dual diversity 2.4 GHz 8dBi Omni’s
Integrated 5GHz 20dBi panel
‘Local Access Node’
WLAN-A0030Integrated quad diversity (spatial & pol) 2.4 GHz 8dBi Patch antennas
‘Indoor MIMO AP Enclosure’
WLAN-A0031Integrated diversity 2.4 GHz 7dBi Omni’s
‘Outdoor AP Enclosure’
WLAN-A0032Dual integrated 2.4 GHz 14dBi Panel antennas
‘Indoor AP Enclosure’
‘Outdoor diversity/2 channel link’
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To the future High performance antenna technology
Optimisation-based design Wide band Low loss Low sidelobes
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To the future Integrated Multi-sector enclosures
Compact integrated outdoor enclosure for 5GHz Quad-reconfiguarable sector array
4x 90 degrees 2x180 degrees 1x360 degrees
4x 90 degrees 2x 180 degrees 1x 360 degrees
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To the future Antenna sharing for Nstreme 2
Only one pair of antennas to run Nstreme 2 Minimise installation costs and mounting space Need wideband antenna, diplexer
HI Freq
DiplexerTX Radio
RX RadioLO Freq
Routerboard
HI Freq
DiplexerRX Radio
TX Radio LO FreqRouterboard
LO Band HI Band
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To the future Dual polarised antenna enclosure
Two antennas in one enclosure, HP and VP Single Nstreme 2 enclosure
Now Available !!!
WLAN-A0043Dual polarised 5 GHz 20dBi
Integrated panel