Siemens SIMATIC RF662A 사용 설명서 - 페이지 18

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Antenna patterns

5.2 Antenna patterns in the ETSI frequency band

5.2

Antenna patterns in the ETSI frequency band

Directional radiation pattern ETSI

The directional radiation pattern is shown for nominal alignment and a center frequency of

866.3 MHz. The nominal antenna alignment is given when the antenna elevation is provided

as shown in the following figure.

Figure 5-2

Reference system

The half-power beamwidth of the antenna (opening angle) is defined by the angle between

the two -3 dB points (corresponding to half the power in relation to the maximum power).

The range (in %) corresponding to the dB values in the patterns can be obtained from the

table in the section "Interpretation of directional radiation patterns (Page 22)".

Note that the measurements presented graphically below were carried out in a low-reflection

environment. Deviations can therefore occur in a normally reflecting environment.

Operating Instructions, 12/2022, C79000-G8976-C684-01

SIMATIC RF662A