Wireless Fundamentals Describing Antennae
Antenna Principles <ul><ul><li>The r adiation pattern describes coverage shape . </li></ul></ul><ul><ul><li>RF radiation p...
Polarization <ul><ul><li>Polarization describes the orientation of the electric field. </li></ul></ul><ul><ul><li>It can b...
Magnetic Field <ul><ul><li>90 degrees perpendicular to the electric field </li></ul></ul>
Diversity <ul><li>Some wireless technologies use diversity to choose, on a per - client basis, which antenna to use to rec...
Antenna Types
Basic Omnidirectional <ul><li>“Rubber Duck” 2.14 dBi Dipole </li></ul>
Omnidirectionals <ul><li>AIR ANT 1728, Ceiling Mount Omni 5.2 dBi </li></ul>
AIR ANT 2506/24120 <ul><li>5.2 dBi Omni Mast Mount 12 dBi Omni Mast Mount </li></ul>
Special “Omnis” <ul><li>Dual Patch Omnidirectional </li></ul><ul><li>5.2 dBi, Pillar Mount </li></ul>
Directional Antennae <ul><li>8.5 dBi Patch, Wall Mount </li></ul>
Directional <ul><li>13.5 dBi Yagi Ude Butterfly Effect, Polarization </li></ul>
Directional (Cont.) <ul><li>21 dBi Parabolic Dish </li></ul>
Cables and Connectors “ RP-TNC” connector is used on most Cisco APs. “ N” connector is used on the 1500 Mesh and 1400 Brid...
<ul><li>An attenuator would be positioned in the same way as the amplifier, but it would not require a power supply. </li>...
Lightening Arrestors <ul><li>Model to Insert Between Antenna and Cable </li></ul>
Lightening Arrestors (Cont.) <ul><li>Fiber Interface </li></ul>Ethernet Lightening Arrestor
Splitters <ul><li>Splitters divide the signal between two antennae, but considerably reduce range: a 21 dBi dish loses 4 d...
Summary <ul><ul><li>Each antenna radiates in a unique way. </li></ul></ul><ul><ul><li>Wireless uses vertical polarization....
 
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Iuwne10 S01 L04

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Iuwne10 S01 L04

  1. 1. Wireless Fundamentals Describing Antennae
  2. 2. Antenna Principles <ul><ul><li>The r adiation pattern describes coverage shape . </li></ul></ul><ul><ul><li>RF radiation pattern is described by E - plane (elevation chart) and H - plane (azimuth chart) . </li></ul></ul><ul><ul><li>Expressed in dB . </li></ul></ul><ul><ul><li>Each antenna design produces different RF radiation patterns . </li></ul></ul>
  3. 3. Polarization <ul><ul><li>Polarization describes the orientation of the electric field. </li></ul></ul><ul><ul><li>It can be linear or circular. </li></ul></ul><ul><ul><li>The magnetic field is on the right of the electric field. </li></ul></ul><ul><ul><li>Wireless antennae can use any polarization, but consistency is required. Vertical polarization is common. </li></ul></ul>
  4. 4. Magnetic Field <ul><ul><li>90 degrees perpendicular to the electric field </li></ul></ul>
  5. 5. Diversity <ul><li>Some wireless technologies use diversity to choose, on a per - client basis, which antenna to use to receive and which to answer. Antennae should be the same type and in the same area. </li></ul>
  6. 6. Antenna Types
  7. 7. Basic Omnidirectional <ul><li>“Rubber Duck” 2.14 dBi Dipole </li></ul>
  8. 8. Omnidirectionals <ul><li>AIR ANT 1728, Ceiling Mount Omni 5.2 dBi </li></ul>
  9. 9. AIR ANT 2506/24120 <ul><li>5.2 dBi Omni Mast Mount 12 dBi Omni Mast Mount </li></ul>
  10. 10. Special “Omnis” <ul><li>Dual Patch Omnidirectional </li></ul><ul><li>5.2 dBi, Pillar Mount </li></ul>
  11. 11. Directional Antennae <ul><li>8.5 dBi Patch, Wall Mount </li></ul>
  12. 12. Directional <ul><li>13.5 dBi Yagi Ude Butterfly Effect, Polarization </li></ul>
  13. 13. Directional (Cont.) <ul><li>21 dBi Parabolic Dish </li></ul>
  14. 14. Cables and Connectors “ RP-TNC” connector is used on most Cisco APs. “ N” connector is used on the 1500 Mesh and 1400 Bridge. “ RP-SMA” connector is used on some Linksys products. “ SMA” connector is used on “ pig-tail” type cable assemblies.
  15. 15. <ul><li>An attenuator would be positioned in the same way as the amplifier, but it would not require a power supply. </li></ul>Attenuators and Amplifiers
  16. 16. Lightening Arrestors <ul><li>Model to Insert Between Antenna and Cable </li></ul>
  17. 17. Lightening Arrestors (Cont.) <ul><li>Fiber Interface </li></ul>Ethernet Lightening Arrestor
  18. 18. Splitters <ul><li>Splitters divide the signal between two antennae, but considerably reduce range: a 21 dBi dish loses 4 dBi. Its range drops from 33 to 21 km on each side. </li></ul>
  19. 19. Summary <ul><ul><li>Each antenna radiates in a unique way. </li></ul></ul><ul><ul><li>Wireless uses vertical polarization. </li></ul></ul><ul><ul><li>Some APs use diversity to offer better resistance to multipath issues. </li></ul></ul><ul><ul><li>Antennae can be directional or omnidirectional. </li></ul></ul><ul><ul><li>Omnidirectional antennae radiate 360 degrees in the H-plane. </li></ul></ul><ul><ul><li>Directional antennae focus their beam more or less depending on models. </li></ul></ul><ul><ul><li>Connectors are usually specific to a vendor. </li></ul></ul><ul><ul><li>Attenuators and amplifiers can be added to change the power transmitted to the antenna. </li></ul></ul><ul><ul><li>Lightening arrestors can mitigate the impact of surrounding lightening strikes on the AP and the network. </li></ul></ul><ul><ul><li>Splitters can be used to split the signal of one AP to two antennae. </li></ul></ul>

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