User's Manual

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MS- RA1xM Radar Module
MS-RA1xM Datasheet
4. Antenna Characteristics
The MS-RA1xM radar module has 1T1R PCB patch antennas with a peak gain of approximately 1 dBi
to 8 dBi, and each module is comprised of 1 to 4 arrays. A higher number of array components leads
to a concentration of antenna energy forward—the detection range increases in front, but decreases in
the horizontal/vertical direction.
Performance can be maximized with a better understanding of the antenna characteristics of the MS-
RA1xM radar module and the positioning of antennas in actual applications. The patch antennas
embedded in the RA1xM module require accurate allocation due to their different antenna beam widths
in the horizontal and vertical directions. As shown in the figure 3 below, the beam width in the horizontal
direction is wider than the beam width in the vertical direction. This characteristic must be taken into
account when positioning the antennas.
Figure. 3 shows the directionality in relation to antenna position of MS-RA11M. The antenna gain and
beam width values in Table 4 were obtained based on the directionality of figure. 3.
Figure 3. Antenna Directionality
In figure 3, the horizontal plan refers to the azimuth direction in the antenna system, while the vertical
plan refers to the elevation direction.
Horizontal
plan
Vertical plan