User's Manual

Appendix A. Radio Signal Propagation
BreezeNET DS.11 Series A-11 User’s Guide
travel in a straight line, but is reflected or deflected off of the object, creating
multiple propagation paths.
When installing a single antenna, modify the transmit antenna option to either
antenna 1 or antenna 2, according to the antenna being used (refer to section
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).
1.1.2.2 Antenna Polarization
Antenna polarization must be the same at either end of the link. In most
applications, the preferred orientation is vertical polarization. Above-ground
propagation of the signal is better when it is polarized vertically. To verify antenna
polarization, refer to the assembly instructions supplied with the antenna set.
1.1.3. Construction Materials
A cell’s coverage area is affected by the construction materials of the walls,
partitions, ceilings, floors and the furnishings of the cell. Due to their intrinsic
nature, these materials may cause radio signal loss:
• Metal objects reflect radio signals. They do not let the signals pass through.
• Wood, glass, plastic and brick reflect part of the radio signals and allow part
of the radio signals to pass through.
• Water and objects with a high moisture content absorb a large part of the radio
signals.
Use the following table as a guidline to predict the effects of different materials.