Microwave Antenna Human Detection for Stationary Targets
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Solution Overview
Problem
Existing sensors, such as infrared and ultrasonic sensors, struggle to accurately detect stationary humans and are prone to interference, leading to misjudgment and inconvenience in daily life.
Innovation Solution
A device and method utilizing microwaves for wireless human detection, comprising a microwave module with an antenna that generates a microwave alert area, monitors interference echoes, and uses a microprogrammed control unit (MCU) to identify target objects based on electrical signal changes, reducing false detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared sensors are used to detect humans, then the detection capability is improved, but the sensor becomes insensitive when ambient temperature is close to body temperature, resulting in misjudgment
Solution Approach 1:
The patent replaces infrared sensors (thermal detection) with microwave sensors (electromagnetic wave detection). The microwave module emits microwaves that reflect off the human body, and the reflected waves are detected to determine human presence. This substitution eliminates temperature interference because microwave detection relies on electromagnetic wave reflection rather than thermal radiation detection.
Solution Approach 2:
The patent changes the detection parameter from infrared radiation (thermal parameter) to microwave reflection (electromagnetic wave parameter). By using microwave frequency electromagnetic waves instead of infrared radiation, the system detects changes in wave reflection caused by human presence, which is independent of temperature conditions.
2Measurement precision
If ultrasonic sensors are used to detect stationary users, then the detection capability is improved, but false detections occur due to interference from other objects
Solution Approach 1:
The patent replaces ultrasonic sensors (acoustic wave detection) with microwave sensors (electromagnetic wave detection). The microwave-based detection system uses electromagnetic waves instead of sound waves, providing better penetration and reflection characteristics that reduce false detections from environmental objects.
Solution Approach 2:
The patent introduces an MCU module as an intermediary that processes the raw detection signals from the microwave module. The MCU analyzes the reflected microwave signals, filters out interference from non-human objects, and makes intelligent judgments about human presence, thereby reducing false detections.
3Device complexity
If traditional sensors are used for human detection, then the device complexity is reduced, but the ability to detect stationary targets is lost
Solution Approach 1:
The patent implements a dynamic detection mechanism where the microwave module continuously emits microwaves and monitors reflected waves in real-time. The system dynamically adjusts to detect both moving and stationary targets by monitoring changes in the reflected wave patterns over time, enabling stationary target detection without overly complicating the device structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The microwave-based system effectively detects stationary humans with high accuracy and reduces interference, improving detection reliability and reducing false alarms.
Implementation Method 1
the microwaves in the space microwave alert area interfere with echoes formed after the microwaves are reflected by a surface of an object
Implementation Method 2
the microwaves in the space microwave alert area interfere with echoes formed after the microwaves are reflected by a surface of an object
Data Source
AI summary
Disclosed is a device for wireless human detection based on microwaves, the device includes a microprogrammed control unit (MCU) module and a microwave module, where the microwave module is electrically connected to the MCU module, the microwave module is provided with a microwave antenna, the microwave antenna emits microwaves to generate a space microwave alert area with a preset dimension in an axial direction of the microwave antenna, and the microwaves interfere with reflected echoes, such that power of the microwave antenna is changed; the microwave module converts a power change into an electrical signal and transmits the electrical signal to the MCU module; and the MCU module receives the electrical signal and identifies a target detection object.