User's Manual

Honeywell Sensing and Productivity Solutions 27

Installation and Technical Manual for the

Limitless™ Multi-Protocol Receiver, WMPR Series

ISSUE 1

32309669

m WARNING

If a person comes in contact with electrical power, and

cannot move

DO NOT TOUCH THAT PERSON OR RISK

ELECTROCUTION.

• Use a non-conductive dry board, stick, or rope to push,

pull, or drag them so they no longer are in contact with

electrical power.

• Once they are no longer contacting electrical power,

administer CPR if certiﬁed, and make sure emergency

medical aid has been requested.

8.2 | Antenna Designs and Considerations

8.2.1 Omni-directional Antenna Design

The Limitless™ Series omni-directional antennas were chosen for

their ability to be used in applications where transmit-and-receiver

antennas may be moving with respect to each other or could be

stationary. These monopole and dipole antennas radiate power

(power from the internal radio of the WMPR monitor) in a 360° out-

ward pattern in a plane perpendicular to the length of the antenna

element. The term “omni” may suggest that the antenna radiates

power in all directions, but that is not the case. The actual anten-

na radiation pattern looks more like a toroid (doughnut-shape) as

shown in Figure 44.

Figure 44. Radiation Pattern of an Omni-directional Antenna

Toroid Radiation Pattern - Pattern

is 360 degrees in the vertical plane,

but not the horizontal plane

2.0 dBi RF Antenna Pattern - Hori-

zontal

2.0 dBi RF Antenna Pattern - Vertical

The antenna radiates virtually zero power in the Z axis and most of the power in the X and Y axis. Increasing the antenna’s gain will

increase the power only in the X and Y axis. As a result, the radiation pattern becomes narrower. For instance, this is analogous to

the reﬂector in an automobile’s headlight. The reﬂector does not add light or increase the luminous intensity of the light bulb, rather it

simply directs all the light energy in the forward direction where the light is needed most.