
RLX2-IHx Series ♦ 802.11a, b, g, n
Appendix G - Antenna Configuration
Industrial Hotspots
User Manual
ProSoft Technology, Inc.
Page 223 of 248
13.2.3 Yagi Array Antenna
A yagi array antenna is composed of an array of linear elements, each parallel to one
another and attached perpendicular to, and along the length of, a metal boom. The
signal is connected to only one of the elements. Elements on one side of the connected
element are longer and act as reflectors; elements on the other side are shorter and act
as directors. This causes the antenna to radiate in a beam out of the end with the shorter
elements. The pattern depends on the overall geometry, including the number of
elements, element spacing, element length, and so on. Sometimes the antenna is
enclosed in a protective tube hiding the actual antenna geometry (as shown in the image
below).
The antenna pattern is a beam pointed along the boom toward the end with the
shorter elements. The beamwidth varies with antenna geometry but generally is
proportional to the length (where longer length produces a narrower beam).
The antenna gain varies with antenna geometry but generally is proportional to the
length (where longer length produces higher gain). Typical values are 6 to 15dBi.
The antenna polarity is Linear (parallel to the elements, perpendicular to the boom).