Microwave motion detector with target angle detection

A microwave motion detector comprising:

• a transmitting antenna for transmitting microwave signals,
• two receiving antennas for receiving from each antenna reflected transmitted microwave signals from a target in two separate channels, and
• processing circuitry adapted to:
• determine a target ratio from a phase difference between each signal in the separate channels, and
• disregard motion from the target when the target ratio is less than a predetermined amount.

An alarm system comprising:

• a PIR sensor with a PIR detection pattern,
• a microwave motion detector with a microwave detection pattern that is wider than and overlaps the PIR detection pattern, wherein the microwave motion detector comprises a transmitting antenna for transmitting microwave signals and two receiving antennas for receiving reflected transmitted microwave signals from a target in two separate channels, and
• processing circuitry adapted to:
• determine a target ratio from a phase difference between each signal in the separate channels, and
• disregard motion from the target when the target ratio is less than a predetermined amount.