Data Sheet

© RFbeam Microwave GmbH | Schuppisstrasse 7 | CH-9016 St. Gallen | www.rfbeam.ch | K-LC5 | data sheet 03/2021 – Revision G | Page 5 / 9
OUTLINE DIMENSIONS
APPLICATION NOTES
Figure 3: Outline dimensions
Sensitivity and Maximum Range
The values indicated here are intended to give you a
‘feeling’ of the attainable detection range with this mo-
dule. It is not possible to define an exact RCS (radar
cross section) value of real objects because reflectivity
depends on many parameters. The RCS variations ho-
wever influence the maximum range only by
4
√σ
4
√
σ
r = 0.0167 · 10 ·
-s
40
.
Maximum range for Doppler movement depends
mainly on:
– Module sensitivity
S: -118dBc ( @ 1 kHz IF Bandwidth)
– Carrier frequency
f
TX
: 24.150GHz
– Radar cross section RCS “reflectivity”
of the object
σ
1)
: 1 m² approx. for a moving person
> 50 m² for a moving car
note
1)
RCS indications are very inaccurate and may vary
by factors of 10 and more.
The famous “Radar Equation” may be reduced for our
K-band module to the following relation:
4
√σ
4
√
σ
r = 0.0167 · 10 ·
-s
40
Using this formula, you get
an indicative detection range of:
– 15 meters for a moving person.
– 40 meters for a moving car
Please note, that range values also highly depend on
the performance of signal processing, environment
conditions (i.e. rain, fog), housing of the module and
other factors.
By reducing IF amplifier bandwidth, detection range
can be enhanced. With BW = 250 Hz instead of 1 kHz,
sensitivity will raise by 6 dB to -124 dBc. Maximum
range will then become 21 m.