User's Manual Part 1

16 APCD-LM043-8.0 (DRAFT C)
3: Detailed Description
mount vertically on walls (using drywall screws), or horizontally (on desks, for example, using
the suction cups). The concave surface of the antenna is the front.
Figure 7 WaveRider Indoor Directional Antenna with Switched-beam Diversity
The WaveRider diversity antenna contains two vertical antenna elements mounted inside and
on either side of the antenna housing. The phasing between these elements, which modifies
the antenna pattern, is controlled by a DC voltage from the EUM. It produces two patterns, one
perpendicular to the face of the antenna, which has a gain of about 6 dBi, and the other, a
dual-beam pattern off both sides, offering about 3 dBi gain for each beam. These beam
patterns are illustrated in Figure 8.
Figure 8 WaveRider Switched-beam Diversity Antenna — Beam Patterns
The EUM samples the signal strength from both antenna patterns during the preamble of
every received packet and automatically selects the best signal. When the EUM transmits, it
sends on the antenna pattern that was last used to receive a signal. Since most of the traffic
Antenna
Front
Beam Pattern A
Beam Pattern B