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DF800 Series

K-Band Doppler Transceiver DF Modules

Application Note

V1.00

ST Engineering Electronics Ltd.

ST Engineering Hub, 1 Ang Mo Kio Electronics Park Road, #06-02,

Singapore 567710

Tel: (65) 6521 7888 Fax: (65) 6521 7801 Email: info@agilsense.com

Website: www.agilsense.com ( Regn. No.: 199103901W )

1. Introduction

The DF800 series microwave motion sensor modules are K-Band Bi-static Doppler transceiver front-

end modules. These modules are designed for speed detection with direction of motion recognition and

are suitable for traffic applications.

The module consists of Dielectric Resonator Oscillator (DRO),

balanced mixers, patch antenna, built-in LNA for high sensitivity

and a pre-amplifier (see Figure 1).

This Application Note highlights some important points for

application with DF800 series.

2. User interface and mounting

6-way 2.54 mm pin header is used for user interface and the four mounting holes of M2.5 screw size are

as shown in Figure 2.

Pin definition

1: EN

2: V

3: GROUND

4: I

5: Q

6: NOT IN USE

Figure 1: Block Diagram

Mounting

through holes

size M2.5

Figure 2: Pin definition and mounting holes

Summary of content (15 pages)

PAGE 1
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 1. Introduction The DF800 series microwave motion sensor modules are K-Band Bi-static Doppler transceiver frontend modules. These modules are designed for speed detection with direction of motion recognition and are suitable for traffic applications. The module consists of Dielectric Resonator Oscillator (DRO), balanced mixers, patch antenna, built-in LNA for high sensitivity and a pre-amplifier (see Figure 1).
PAGE 2
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 3. Power Supply There is a built-in voltage regulation in the DF800 series modules. As such, the performance of the DF800 series modules is not affected by variation of voltage supply as long as the supply is within the specification such as 2.7V, 3.3V and 5V. 4.
PAGE 3
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 H-plane 0 0 330 30 -5 -10 -15 60 300 -20 -25 -30 90 0 -5 -10 -15 -20 -25 -35 -30 -35 -30 27 -30 -25 -20 -15 -10 -5 0 -25 -20 120 240 -15 -10 -5 210 150 0 180 Azimuth E-plane 0 0 330 30 -5 -10 -15 60 300 -20 -25 -30 90 0 -5 -10 -15 -20 -25 -35 -30 -35 -30 27 -30 -25 -20 -15 -10 -5 0 -25 -20 120 240 -15 -10 -5 150 210 0 180 Elevation Figure 3: Beam pattern of DF100 6.
PAGE 4
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 Figure 4: Frequency response of IF amplifier of DF800-0 7. IF output signals Doppler shift - Doppler-shift signals of ideally 90o phase difference between them appears at I & Q channels when movement is detected. These signals are pre-amplified by built-in IF amplifiers for better sensitivity and better isolation. The magnitude of the Doppler Shift after these amplifications is typically within 1V peak to peak.
PAGE 5
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 Pt G 2λ2σ Pr = (4π ) 3 r 4 Where Pt is the power transmitted by the module, G is the gain of the transmitting and receiving antennas, assuming same gain. λ is the wavelength of the transmitted signal σ is the radar cross section of the target r is the distance between the module and the target. The parameters Pt, G and λ are intrinsic to the modules and are part of the design consideration.
PAGE 6
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 A half wavelength of a 24 GHz in the air is about 6mm. However, the half wavelength of the signal in other medium depends on the dielectric constant of the material. In the case of ABS which has a dielectric constant of between 2.5 to 3.5, the half wavelength of the signal is 3 – 4 mm. ABS h1 ~ 3-4 mm h2 ~ 6mm DF unit Figure 5: Recommended thickness and clearance for ABS placed in front of DF sensor 10.
PAGE 7
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 at the IF output (brown line) and the DC steady state is achieved after t2. For the duration between t1 and t2, there are Doppler signals but the dynamic range is poorer as the steady state has not been achieved yet. If the dynamic range in this duration is not problem, speed can be measured after t1. In general, we recommend that the speed measurement starts only after t2.
PAGE 8
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 11. Radiation Safety Microwave radiation from the module is well below established safety standards for general public environment, like ANSI C95.1-1991 of USA and NRPB-G11 of United Kingdom. 12. Handling The module has been fully tested to specifications. Opening, tightening or loosening the chassis may result in performance deterioration. The module is an electrostatic sensitive device (ESD).
PAGE 9
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 Annex 1: Transmission of RF 1. 2. 3. 4. 5. Though same frequency is allocated in some countries, national regulations may specify different EIRP, spurious emission or other requirements. ETS EN300 440 is the recommended harmonized standard for European Community, member country may adopt their own national regulation.
PAGE 10
DF800 Series K-Band Doppler Transceiver DF Modules Application Note Annex 2: Federal Communication Commission Interference Statement V1.00 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
PAGE 11
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 2.5 Trace antenna designs Not applicable. 2.6 RF exposure considerations This equipment complies with FCC mobile radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator & your body.
PAGE 12
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 Manual Information To the End User The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user’s manual of the end product which integrates this module. The end user manual shall include all required regulatory information/warning as show in this manual.
PAGE 13
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 Annex 3: Industry Canada statement This device complies with ISED’s licence-exempt RSSs. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Le présent appareil est conforme aux CNR d’ ISED applicables aux appareils radio exempts de licence.
PAGE 14
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 IMPORTANT NOTE: In the event that these conditions cannot be met (for example certain laptop configurations or co-location with another transmitter), then the Canada authorization is no longer considered valid and the IC ID cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate Canada authorization.
PAGE 15
DF800 Series K-Band Doppler Transceiver DF Modules Application Note V1.00 Annex 4: Doppler Equation Where  Ft  Fd = 2V Cosθ c Fd = Doppler frequency V = Velocity of the target Ft = Transmit frequency c = Speed of light (3 X 108m/sec) θ = The angle between the target moving direction and the axis of the module. If a target is moving straight toward or away from DF100 (Ft = 24.125 GHz) The formula is simplified to: Fd = 44.7V (Velocity in km/hour) or 71.