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How does the Cambium Sector Antenna support 90 degree and 120 degree deployments?

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How does the Cambium Sector Antenna support 90 degree and 120 degree deployments?

sector_antenna_alpha_channel.pngSector Antenna

Cambium Networks has designed an antenna solution that enables network operators to increase the spectral efficiency and scale of their ePMP™ point-to-multipoint(PMP) distribution access networks.

 

Wireless Service Providers deploying networks in 5 GHz spectrum will find this sector antenna for 90 degrees and 120 degrees applications especially well-suited for high-density networks requiring frequency re-use and wide-band spectrum coverage.

 

The Half power Beamwidth (HPBW) measurement is important to understand how the antenna will support link budgets in your network:

  • The Half power Beamwidth is the angle at which the gain of the antenna drops by 3dB (90° for the Cambium Sector Antenna).
  • For +/- 45° in 90° sectors (the edges of the sector), the gain at the edge of the sector is 3 dB lower than boresight (directly in front of the antenna).
  • At +/- 60° in 120° sectors (the edges of the sector), the gain at the edge of the sector is 6 dB lower than boresight.

As a result, from +45° to +60° and from -45°to -60° (effectively the horizontal plane beamwidths between the 90° and 120° sectors), while there is additional attenuation (3 dB-6 dB), it is still a usable space for deployment!

 

horizontal_plane_antenna_pattern.pngHorizontal Plane Antenna PatternGeneral deployment tips for using the antenna as a 90° or 120° sector

1.Isolated deployments (one sector) or if not using frequency reuse, the 120° sector provides the most coverage.  In this case, deploy subscribers within 120° - generally speaking, the wider the beamwidth, the better since there are no additional sectors / deployments to consider.

2.When re-using frequencies at the same tower or on other towers, considerations must be made for the neighboring sites.  In this case, deploying subscribers only into a 90° beamwidth is beneficial to avoid interference between sites.  Even though the antenna supports 120° beamwidth, there is no detrimental effect in frequency reuse deployments.