Specification TypeTK0020 77GHz Radar Sensor 4.0 2022/6/1 1 Introduction Radar Chip with Antenna V
F O V H-FOV Spec. 76 GHz ~ 81 GHz (CW mode : 79 GHz) 6 dBm H/V : 130 / 60 Short range: 5 m Extended Range: 20m 6.52x6.02x0.8mm(WxLxH) 24.32 x 32.88 x 10.5mm(WxLxH) UART (2.54mm pitch connector) 12V/0.85W(MAX) Item Frequency Transmit Power Beam Width Distance IC IC Dimension Module Dimension Output
Power Supply 1 BAT TX RX G LIN Fig 1 The Radar Sensor PCB Outline Fig 2 The Radar Sensor PCB Dimension 2 Electrical Specifications All-in-One 79GHz Radar sensor enabling motion and distance detection Features Easy to use, built-in motion/distance detection function enables only UART/OWI connection for settings & result acquisition. Wide FOV for detection. Detection area (75mm plastic pole) : 5m (ver. S) or more (ver. E), FOV-
H/V: 130o / 60o Applications Simple anti-collision protection for vehicles. Object detection, e.g. in confusing or unclear areas. Distance/velocity detection, e.g. altitude measurement. System Block Diagram Pin Description Pin name BAT TX RX G LIN Description DC 12V input UART Transmission output, TTL 3.3V UART Received input, TTL 3.3V Ground Reserved for OWI interface (Optional) 3 Fig 3 Connector drawing 4 2 Radar sensor installation 2.1 The radar sensor Fig 4 shows the side view and transparent view of the radar sensor, where the mechanical design is very critical. The Dk/Df material of the plastic housing and the PCB position affect performance a lot. Especially the front side area, since it is in the antenna near field and the dimension/assembly
, the radome to radar sensor affects the antenna pattern serious, the radome thickness=
, the PCB size/Housing shape and the housing/ randomes Dk( = 3) package space=
should be well controlled and followed the reference design. Fig 4 The side view of the radar sensor The radome thickness is designed as (
), where = 1,2,3 Therefore, it controls the transmitted waves all in phase to obtain the minimum reflected signal through the impedance discontinuous of the radome. For instance, if the = 3 and = 1, the radome thickness is 1.09 . Fig 5 shows the minimum reflection happened when the space between radome to top of Radar sensor package is , i.e. 3.79 . Fig 5 The assembly space control 5 3 Radar System Development Kit(SDK) Functionality Description 3.1 Electric Car Fig 6 shows the application situations of electric cars. Radars can be installed in the front and side of cars, and detection area diameter is up to 3m. The functionality description as below:
a. Presence detection (objects and people) b. Automatic adjustment of alert volume with distance Fig 6 The scenario diagram of electric cars 3.2 Bicycle Fig 7 shows the application situations of bicycles. Radars can be installed in the back of bicycles, and detection area diameter is up to 3m. The functionality description as below:
a. Presence detection (objects and people) b. Display road conditions by using smart devices (mobile phones, helmets, glasses) Fig 7 The scenario diagram of bicycles 6 Notice 1.1 Start Time 30s Since the module starts to work when it is initially powered on, it is necessary to completely reset the internal circuit of the module and fully evaluate the environmental noise in order to ensure the module can work as expected. Therefore, when the module is initially powered on, it needs a setting time of 30s to ensure the validity of subsequent output parameters. 1.2 Effective Detection Range RCS The detection range of the radar module is greatly related to the target RCS and environmental factors. The effective detection range may change with changes in the environment and the target. This module does not have a ranging function so far, therefore it is normal for the effective detection range to fluctuate within a certain range. 1.3 Radar Biodetection Performance Since human biological characteristics are signals of ultra-low frequency and weak reflection characteristic, radar processing requires a relatively long cumulative processing. During the cumulative process, many factors may affect the radar parameters, so an occasional detection failure is normal. 1.4 Power VCO +12V 80mV The Radar module requires higher power quality than conventional low-frequency circuits. When supplying power to the module, it is required that the power supply has no threshold glitches or ripples, and effectively shields the power supply noise caused by the accessory equipment. The radar module needs to be well grounded. Due to the ground noise brought by other circuits, the performance of the radar module may also be degraded or even work abnormally; the most common one is to shorten the detection distance or increase the false alarm rate. In order to ensure the normal operation of the VCO circuit within the module, the power supply for this module is required to be +12V power supply, and the power supply voltage ripple should be less than or equal to 80mV. The external power supply must provide sufficient current output capability and transient response capability. 1.5 Shield Case FCC part 15 Class B Shield case ,. 7 This product has been tested and found to comply with FCC part15 Class B regulations. The module itself has no Shield case design, and the corresponding platform host needs to have a shielding function to prevent interference.Customers could design the modules into their own terminal products. 1.6 FAQs Interference factors Radar is an electromagnetic wave detection sensor, and moving inanimate objects will cause false alarms. The movement of metals and liquids will lead to misjudgments. Usually, electric fans, pets close to the radar, and the shaking of metal curtains will cause misjudgments. Radar needs to be planned for the installation angle. Non-interference factors Radar electromagnetic waves can penetrate human clothing, curtains, veneer, and glass. It is necessary to determine the installation angle and performance of the radar according to the application. Semi-interference factors:
When the radar judges the presence of a human body, it is not suitable for directly facing the air conditioner. The motor inside the air conditioner will cause the misjudgment. Therefore, it is recommended that radar products should not face the air conditioner directly, or be in the same direction as the air conditioner. FEDERAL COMMUNICATIONS COMMISSION INTERFERENCE STATEMENT This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
-Consult the dealer or an experienced radio/ TV technician for help. CAUTION:
Any changes or modifications not expressly approved by the grantee of this device could void the user's authority to operate the equipment. 8 This module is intended for OEM integrator. The OEM integrator is responsible for the compliance to all the rules that apply to the product into which this certified RF module is integrated. Additional testing and certification may be necessary when multiple modules are used USERS MANUAL OF THE END PRODUCT In the users manual of the end product, the end user has to be informed to keep at least 20 cm separation with the antenna while this end product is installed and operated. The end user has to be informed that the FCC radio-frequency exposure guidelines for an uncontrolled Environment can be satisfied. The end user has to also be informed that any changes or modifications not expressly approved by the manufacturer could void the user's authority to operate this equipment. 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. LABEL OF THE END PRODUCT The final end product must be labeled in a visible area with the following " Contains FCC ID:
2A6LN-TK0020"
This radio transmitter FCC ID: 2A6LN-TK0020 has been approved by FCC to operate with the antenna types listed below with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device. Antenna List :
No. Manufacturer 1 MTK Part No. MT2706 Antenna Type Peak Gain Integrated Antenna 5 dBi RF Exposure warning This equipment must be installed and operated in accordance with provided instructions and the antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter. End-users and installers must be provide with antenna installation instructions and transmitter operating conditions for satisfying RF exposure compliance. 9