microwave sensor

Features •Low cost •Small and Flat Profile •Rugged, Reliable Construction •Low Power Consumption •High Sensitivity Description The Microwave Solutions MDU (Motion Detector Unit) is an K-Band microwave transceiver that utilises the Doppler shift phenomenon to "sense" motion. The circuit features a dielectric resonator stabilised PHEMT-oscillator, which provides stable operation over a broad temperature range in either CW or low duty cycle pulse mode and a balanced mixer for enhanced sensitivity and reliability. Applications •Intrusion Alarms (Room, Vehicle) •Automatic Door Openers •Speed Measurement •Collision Avoidance •Traffic Control •Presence Sensing Operation The basic principle of operation consists of detecting the frequency shift between a transmitted and a received signal reflected back from a moving object within the field of view of the unit. The unit produces a low level IF output signal which can be amplified and processed to provide an audible or visual alarm signal and employs low cost surface mount manufacturing techniques which are field proven as being rugged and reliable. Electrical Characteristics Transmitter Frequency : 24.150 GHz Frequency Setting Accuracy : 50MHz Power Output (Min.) : 13dBm EIRP Operating Voltage : +5V ±0.25V Operating Current (CW) : 60mAmax. : 45mA typ. Harmonic Emissions : < -7.3dBm Pulse Mode Operation Average Current (5% DC) : 2mA typ. Pulse Width (Min.) : 5μSec Duty Cycle (Min.) : 1% Receiver Sensitivity (10dB S/N ratio) : -86dBm Noise : 10μV (Both in 3Hz to 80Hz bandwidth) Antenna Gain : 8dBi -3dB Beamwidth E Plane:36º H Plane:72º Mechanical Characteristics Weight : 6 grams Tab Connections:0.1” spacing Environmental Characteristics Power/Temp. Coefficient (over operating temp. range): 3dB Frequency/Temp. Coefficient (over operating temp. range): 6.5MHz Operating Temperature : -10ºC to +55ºC Storage Temperature : -30ºC to +70ºC NOTES Detection range is dependent on size and reflectivity of target and S/N ratio Doppler shift at 24.150GHz is 75Hz/m.p.h. Unit functions over -30ºC to +70ºC but performance may be degraded above +55 °C.