everything your parents never told you about antennas johan führi design engineer poynting...
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Everything your parents never told you about
antennas
Johan FühriDesign Engineer
Poynting Antennas, South Africa
MUM, Poland 2008
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Poynting Antennas
Antenna and enclosure design and manufacture
Company size 180 people, 2600m2 factory 20 R&D staff (3xPh.D, M.Sc’s, B.Sc’s, Techs) Turnover USD 7.5 million p/a. About 40,000 units per month output. Export to Europe, Australia, Malaysia,
Singapore, Israel and United States. Various low cost, high performance fabrication
technologies developed in-house. Cutting edge outdoor enclosure portfolio with
proven applications globally.
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Overview
What is an antenna? How does it work? What antennas cannot do Antennas in practice New technologies in antenna/enclosure
systems
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What is an Antenna? “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.
Mechanical device that converts an electrical signal into an electromagnetic wave and vice-versa
It is not an AERIAL
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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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How does antennas work?
In summary Antennas focus energy to increase signal High gain means less signal in other
directions Gain depends on antenna size Cannot cheat physics – must reduce loss Antennas can work differently in different
channels
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Antennas in practice
Connecting to the Electronics Choosing the right antenna
Distribution High site CPE
Point-to-Point Indoor
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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
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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
240mm55mm
Compact aesthetic design
IP67 rated, injection-moulded design
Ethernet disconnect cable gland
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iPoynt
Ethernet clip-off gland
IP67 watertight seal
Wireless electronicsIntegrated directional antenna
14dBi @ 2.3-2.7 GHz (x4.0 range*)
17dBi @ 3.3-3.8 GHz (x5.6 range*)
20dBi @ 5.1-6.0 GHz (x8.0 range*)
* Range relative to 2dBi dipole antenna
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iPoynt
Flexible electronics mounting
Grounding lug built into mounting structure
Pigtail Ethernet disconnect gland
N-connector knock-outs
Window knock-out
RB133C/RB411 ready!
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iPoynt
Pole or wall mounting flange
Separate Elevation adjust
Separate Azimuth adjust
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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 Relatively low gain antenna – wide
beamwidth Going through walls – unreliable
signal
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Choosing the right antenna - Diversity
WLAN-A0033
Dual diversity 2.4 GHz 8dBi Omni’s
Integrated 5GHz 20dBi panel
‘Local Access Node’
WLAN-A0030
Integrated quad diversity (spatial & pol) 2.4 GHz 8dBi Patch antennas
‘Indoor MIMO AP Enclosure’
WLAN-A0031
Integrated diversity 2.4 GHz 7dBi Omni’s
‘Outdoor AP Enclosure’
WLAN-A0032
Dual 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
Diplexer
TX Radio
RX RadioLO Freq
Routerboard
HI Freq
Diplexer
RX Radio
TX RadioLO Freq
Routerboard
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
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Thank you