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MSAN
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AP96 K-Band Miniature Doppler Transceiver Module
Application Note
V1.00
Figure 1: Block Diagram
1. Introduction
2. Transmit Frequency
The transmitting frequencies (ISM band) and EIRP (Effective Isotropic Radiated Power) of AP96
sensor module are factory-set and are not user-adjustable.
Transmit frequency, power and other characteristics of Doppler transceiver are regulated by local radio
communication authority. Though end-user license may be exempted, type approval of equipment or
other regulation compliance may be required for the end-product installed with the module. It is the
responsibility of the user to check relevant local short range radio (SDR) regulations before deploying
this module.
Please refer to Annex 3 for more information on transmitting signal.
3. IF Output Signals
Doppler shift - A Doppler signal appears at IF terminal when movement is detected. The magnitude of
the Doppler signal is proportional to the reflection of transmitted energy and is typically in the range of
microvolts (µV). A high-gain low-frequency amplifier is usually connected to the IF terminal in order to
amplify the Doppler shift to a processable level. A recommended amplifier circuit in continuous wave
(CW) and pulse operation can be found in Annex 1 & 2 respectively.
The frequency of Doppler shift is proportional to velocity of motion. Typical velocity of a walking
person generates Doppler shift below 100 Hz. Doppler frequency can be calculated by the Doppler
equation in Annex 4.
The Received Signal Strength (RSS) is the voltage measured at the IF output when the module detects
motion. Reflection of a human body is dependent on the size of the body, clothing, apparels and other
environmental factors. RSS measured for different human bodies may vary by as much as 50%.
AP96 K-Band miniature microwave module is a Doppler
transceiver with built-in features such as a low current
oscillator, a single balance mixer and bi-static microstrip
patch antenna arrays. It is ideal for applications in movement
detection, intruder alarms, lighting controls and speed
measurement.
Its lightweight, miniature size and slim profile offers the
flexibility to OEM manufacturers in making trendy and slim
final products.
ST E
lectronics (Sa
tcom & Sensor Systems) Pte Ltd
1 Ang Mo Kio Electronics Park Road, #06-02, ST Engineering Hub, Singapore 567710
Tel: (65) 6521 7888 Fax: (65) 6521 7801 Email: info@agilsense.com
Website: www.agilsense.com ( Regn. No.: 199103901W )
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