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24GHz Short Distance Speed Sensor & 15m Ir Sensor

This LD1100 24GHz CW radar sensor adopts high-performance I/Q phase detection technology, supporting real-time speed measurement and motion direction identification.

Different from traditional PIR infrared and ordinary microwave sensors, it works all day and night, unaffected by light, rain, fog, dust and temperature changes.

With ultra-thin compact size, low power consumption and global ISM band compliance, it is easy for embedded integration and mass production in smart home, security, automatic door and intelligent lighting systems.

  • Speed & Direction Dual Detection, greatly reduce false trigger
  • 24.15~24.25GHz Global ISM Band, comply with FCC/RED certification
  • 15m Long Detection Distance, 40°×40° Wide Angle Coverage
  • Ultra-thin mini size, easy hidden installation for thin devices
  • All-weather working, no limitation of day/night and harsh environment
  • Low power consumption & wide temperature range -25℃~+55℃
  • SMT patch design, convenient for mass SMT production

Product Selling Points

1. Globally universal and barrier-free

Utilizing the 24GHz frequency band, it supports global unified certification, requires no regional adaptation, and is compatible with market deployment in multiple countries.

2. Wide-area precise detection

With a detection distance of 15 meters and a dual field of view of 40°×40°, it has a wide coverage and can accurately capture the movement direction and speed data of the target.

3. Compact integrated design

With an ultra-thin size of 46×15×1.5mm and a weight of less than 2g, it can be easily embedded in various devices such as alarm systems, automatic doors, and smart home devices without occupying additional space.

4. Stable performance output

12.7dBm output power + 22dB total gain, strong signal anti-interference ability, wide operating temperature range from -25℃ to +55℃, suitable for multiple application scenarios.

5. Low power consumption and strong adaptability

It is powered by a wide voltage range of 3.2-3.4V, with a typical current of only 48mA. It has low energy consumption and is compatible with the power supply systems of most devices.

Main Parameters

Transmit Frequency 24.15 – 24.25GHz
Output Power(EIRP) 12.7dBm
IFBand width(-3 dB) 1MHz
Signal Level IF1/2 : 80µVrms(RCS = 0.5m² @5m)
Noise Level N1/2 : 10 µVrms(100Hz-1kHz)
I/Q Phase Difference 90
I/Q Phase Imbalance εp : ±25
Overall Gain GOA : 22dB(conversion gain + antenna gain)
Field of View Azimuth :40
Field of View Elevation :40
Operating Voltage 3.2-3.4V
Supply Current 48mA( 3.3V at 25°C)
Operating Temperature -25~+55
Storage Temperature -40~+85
Dimensions L/W/H : 46*15*1.5mm
Weight <2 g

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Application

Speed sensor, motion sensor, inductive sensor widely used in:

Smart Lighting System, Automatic Induction Door, Security Alarm, Smart Home, Industrial Motion Detection, Warehouse Access Control, Vehicle Speed Detection.

Does it have onboard signal processing?
No. It is a pure front-end module (VCO, antenna, mixer, I/Q outputs). All signal processing must be done externally.
How do I use the I/Q outputs?
Sample both channels simultaneously with an ADC. Use IQ demodulation to extract speed and direction.
What ADC sampling rate is needed?
IF bandwidth is 1MHz. Recommended: 2–4 MHz, 12-bit or higher.
Can it detect static targets?
No. CW Doppler radar only detects moving targets.
What is the minimum detectable speed?
Depends on your processing. Your low-frequency noise floor (10µVrms from 100Hz–1kHz) is the main limiting factor.
Do you provide reference designs?
Yes. Contact us for evaluation board schematics and application notes.
Is the module certified?
Complies with FCC 15.249 and CEPT REC 70-03. Final product certification is your responsibility.
Any radome design rules?
Distance to antenna: ~λ0/2. Radome thickness: ~λg/2. Follow these to avoid signal loss.

Technical Support & Custom Solution

We provide datasheet, dimension drawing, interface protocol, demo code and technical support.

Support sample test, ODM/OEM customized service, welcome global customers to inquire and cooperate.

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