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K-MC4 Datasheet(PDF) 7 Page - RFbeam Microwave GmbH

Part No. K-MC4
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Maker  RFBEAM [RFbeam Microwave GmbH]
Homepage  https://www.rfbeam.ch/

 7 page
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Application Notes
Using Monopulse Phase Comparison Features
Using multiple antennas allows discrimination of the angle of moving objects. K-MC4 uses two
receiver antennas Rx1 and Rx2.
On the right half, there are the two receiver antennas shown in
different colors. The angle detection happens in the horizontal
plane as shown in the picture.
The antenna layout results in a horizontal -6dB (IF voltage) beam
width of 30° according to Fig. 2.
The usable angle detection will be approx +/- 13°.
Please note, that the vertical beam width is narrower (12°)
because of the geometry of the antenna.
Fig. 7: Angle detection direction vs. antenna arrangement
A more detailed explanation of the effects by using two receiver channel are shown in the figure
The phase shift of the received Doppler carrier waves appears between the outputs I1 and I2 or Q1
and Q2.
Object's angle in ° can be can be calculated as
= 
= phase shift Ix−Qx
The sign of
α changes depending on the moving direction of the object (forward or backward).
© RFbeam Microwave GmbH, Schuppisstrasse 7, CH-9016 St. Gallen
Page 7/11
Fig. 8: Antenna Rx1 reveives a delayed reflection
d =
K-MC4 (top view)
phase shift
moving object

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