Microwave Motion Sensor
KMY 24
Description
The KMY 24 is a microwave rader motion sensor
based on the Doppler effect. It transmits a low
energy microwave radiation at 2.45 GHz which is
reflected by objects. If the object is moving relative
to the sensor, a Doppler shift occurs. The shifted
wave is mixed with the original wave in two mixers,
resulting in two output voltage signals. The phase
shift between these two signals is negative or
positive depending on whether the target is
approaching or receding from the detector.
Features
•
•
•
•
•
•
•
•
High sensitivity
Dual Mixers enabling direction detecting
High reliability
Low power consumption
Low harmonic emission
Small size
Light weight
Low cost
Marking
KMY 24
Ordering Code Operating Frequency
Q62702-R323
2.45 GHz
License No.
BZT G127520H
Typ
KMY 24
Pin Configuration
1
2
3
4
−
V
S
(GND)
V
D1
(output voltage D1)
V
D2
(output voltage D2)
+
V
S
SIEMENS
KMY 24
Notes:
1 2 3 4
1. Solder pads must not be perforated, as this will damage,
EHA07260
and may destroy the multilayer PC Board.
2.
Regulations on the use of High frequency devices.
The use of high frequency devices is regulated in most
countries and certain frequencies can be subject to restrictions. The use of the KMY 24 should be clarified with
the respective authorities in each country to ensure compliance with the prevalent legislation.
Data Sheet
1
1999-04-01
KMY 24
Absolute Maximum Ratings
Parameter
Operating temperature range
Storage temperature range
Supply voltage
Electrical Characteristics
at
T
A
= 25
°C
Parameter
Supply voltage
Operating frequency
Operating current
Detecting range
1)
Amplitude of signal 1
Quotient of amplitude of 1 and 2
Phase difference
Equivalent isotropic radiated power at
f
o
Symbol
min.
Limit Values
typ.
12
2.45
23
5
…
8
1)
Symbol
T
op
T
stg
V
S
Limit Values
−
20
…
+ 60
−
30
…
+ 80
15.6
Unit
°C
°C
V
Unit
V
GHz
mA
m
mV
Degrees
dBm
max.
15.6
2.48
−
−
−
−
−
V
S
f
o
I
op
r
op
V
D1
V
D1
/V
D2
ϕ
2
− ϕ
1
10.8
2.40
−
−
−
−
−
−
2
8
40
…
120
−
EIRP
1) The amplitude of the signal depends on the object size and its distance from the detector. Measurements taken
with 5 cm high, cylindrical metallic objects, moving in circles at a distance of 1 m for example, give signal
amplitudes of typically
V
D1
= 40 mV.
Data Sheet
2
1999-04-01
KMY 24
Output Signal
The phase difference between
V
D2
and
V
D1
is positive, if the target is receding from the
detector.
( ϕ
1
–
ϕ
2
) ≥
0
EHA07261
V
D1
V
D2
Receding
Ch1 10 mV
Ch2
10 mV
M 100 ms
The phase difference between
V
D2
and
V
D1
is negative, if the target is approaching the
detector.
( ϕ
1
–
ϕ
2
) ≥
0
EHA07262
Approaching
V
D1
V
D2
Ch1 10 mV
Ch2
10 mV
M 100 ms
Data Sheet
3
1999-04-01
KMY 24
Typical Radiation Pattern
The diagram shows the typical radiation pattern in the x-z- and y-z-planes. The
z-direction is perpendicular to the patch antenna, x shows the longer and y the shorter
side of the rectangular antenna.
0
0 dB
-10 dB
60
-20 dB
90
30
EHA07263
Package Outline
Special Package
38
5.5
Marking
3
3
0.8
2.5
15.2
ø3.2
26
5
EHA07466
Sorts of Packing
Package outlines for tubes, trays etc. are contained in our
Data Book “Package Information”.
Data Sheet
4
19.9
Dimensions in mm
1999-04-01
Embedded System
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