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The ABC of Wireless Links

The ABC of Wireless Links. Johan F ü hri Business Unit Manager Poynting Antennas, South Africa MUM - Brazil 2008. 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!

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The ABC of Wireless Links

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  1. The ABC of Wireless Links Johan Führi Business Unit Manager Poynting Antennas, South Africa MUM - Brazil 2008

  2. 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

  3. 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.

  4. Components of a Wireless Link Radio Radio Amplifier Amplifier Wireless Antenna Antenna

  5. When stuff goes wrong…

  6. 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

  7. 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 How does antennas work?

  8. More gain = larger size Panel/dish antennas – gain proportional to area Limited by physics Size/gain trade-off Must keep losses down 300cm2 75cm2 8 dBi 14 dBi 20 dBi 1200cm2 How does antennas work?

  9. http://www.trevormarshall.com/waveguides.htm 140-159 160-179 180-199 100-119 120-139 What antennas cannot do • Antenna ‘bandwidth’ • Can’t work over arbitrarily wide number of channels • Frequency limited

  10. Getting it right first time • Choosing the right antenna • Distribution (WISPs) • High site • CPE • Point-to-Point • Indoor • Connecting to the Electronics

  11. 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 Finish Start

  12. UV stabilised, shielded ethernet cable Weatherproof enclosure Integrated panel antenna Infrastructure location Wireless card Routerboard platform POE Injector Wired network Mains AC Mounting Electronics Outdoor

  13. Choosing the right antenna • Omni-directional antennas – The Ultimate Solution?

  14. Choosing the right antenna • Sector Antennas • Cover only the areas that you need to cover • Multiple sector antennas per enclosure • One antenna per radio

  15. Choosing the right antenna • Client Premises Equipment – CPE • What is important? • Easy installation • Aesthetics • Good performance • Low cost

  16. 240mm 55mm Compact aesthetic design IP67 rated, injection-moulded design Ethernet disconnect cable gland 230mm iPoynt

  17. 134mm 194mm MikroPoynt Compact aesthetic design IP67 rated, injection-moulded design Water tight cable entry Designed for RB411 Pole mount (standard) Wall mount (standard) Window mount (standard)

  18. Choosing the right antenna • Point-to-Point • High gain dish/panels with heavy duty enclosures (long range) • Fully integrated medium gain solution (medium range)

  19. 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

  20. Choosing the right antenna • Indoor Antennas • Main problem is Multipath Interference • Space diversity • Polarisationdiversity • MikroPoynt Dual Polarised coming soon! • Relatively low gain antenna – wide beamwidth • Going through walls – unreliable signal

  21. Choosing the right antenna - Diversity WLAN-A0030 Integrated quad diversity (spatial & pol) 2.4 GHz 8dBi Patch antennas ‘Indoor MIMO AP Enclosure’ WLAN-A0032 Dual integrated 2.4 GHz 14dBi Panel antennas ‘Indoor AP Enclosure’ ‘Outdoor diversity/2 channel link’ WLAN-A0033 Dual diversity 2.4 GHz 8dBi Omni’s Integrated 5GHz 20dBi panel ‘Local Access Node’ WLAN-A0031 Integrated diversity 2.4 GHz 7dBi Omni’s ‘Outdoor AP Enclosure’

  22. To the future • High performance antenna technology • Optimisation-based design • Wide band • Low loss • Low sidelobes

  23. 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

  24. HI Band LO Band HI Freq HI Freq RX Radio TX Radio Diplexer Diplexer Routerboard Routerboard LO Freq LO Freq TX Radio RX Radio 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

  25. To the future • Dual polarised antenna enclosure • Two antennas in one enclosure, HP and VP • Single Nstreme 2 enclosure WLAN-A0043 Dual polarised 5 GHz 20dBi Integrated panel Now Available !!!

  26. Thank you Johan.fuhri@poynting.co.za

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