Ripwave Base Station I&C Guide
Navini Networks, Inc.
30
Part #40-00047-00 Rev D v1.0
February 28, 2003
Radio Frequency Subsystem (RFS)
The Radio Frequency Subsystem (RFS) is mounted on a transmission tower or building rooftop.
It transmits and receives data to and from the Ripwave Customer Premise Equipment (CPE)
using a digital beamforming transmission technique. The RFS may be either a panel antenna or
an omni antenna (Figure 4).
An RFS panel transmits in a directional mode, covering a transmit angle of 120 degrees. The
antenna can be used as a single mode antenna, or it can be used in a group of two or three
sectored antennas, covering 240 and 360 degrees respectively. Each panel requires a BTS to
operate. For example, in a tri-sectored cell with 3 panels, you would need 3 BTS’s. The omni
antenna provides omni-directional coverage of 360 degrees.
An RFS panel or omni contains eight (8) antenna elements, cavity filters, and, optionally, low
noise amplifiers (LNA). For downtilt, the omni must be situated as it comes from the factory. A
panel’s downtilt can be adjusted at the site. The higher up the antenna is placed, the more
downtilt it typically required.
Figure 4: RFS
Panel (Front)
Omni
Panel (Back)
Panel (Front)
Omni
Panel (Back)