Sterba Curtain Antenna Modulation for Low-Power Wireless Sensor Networks
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Solution Overview
Problem
Wireless sensors face high power consumption due to the need for continuous operation of receivers and the energy-intensive data transmission process, which limits their battery life and requires frequent battery changes, especially in applications where weight and power efficiency are critical.
Innovation Solution
A low-power system that modulates sensor data onto incident electromagnetic waves using a Sterba Curtain antenna array and a modulating device, allowing data transmission without a transmitter by modifying the reflectivity and transmittance of the waves, enabling data to be sent using either the reflected or transmitted components, reducing power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a wireless sensor uses a traditional transmitter to send data, then data transmission is achieved, but power consumption increases significantly
Solution Approach 1:
The patent extracts the transmitter component from the wireless sensor system. Instead of having the sensor contain an active transmitter, the sensor only has a receiver that listens for interrogation signals. Data is transmitted by modulating the sensor's response to these signals, eliminating the need for a power-intensive transmitter in the sensor itself.
Solution Approach 2:
The patent introduces an external interrogating device as an intermediary. This device transmits interrogation signals to the sensor and receives modulated responses. The intermediary handles the power-intensive transmission function, allowing the sensor to operate with minimal power consumption.
2Ease of operation
If the receiver is continuously powered on to receive requests, then the sensor can receive interrogation requests, but power consumption increases
Solution Approach 1:
The receiver operates periodically rather than continuously. It is powered on to receive interrogation requests and then powered off until the next expected interrogation. This periodic operation significantly reduces power consumption while maintaining the ability to receive requests at appropriate intervals.
3Ease of manufacture
If wireless sensors are deployed without wiring for quick deployment, then ease of deployment is improved, but power supply becomes a limiting factor
Solution Approach 1:
The patent removes the active transmission function from the sensor, which eliminates the need for high-power batteries. This extraction of the transmitter function allows sensors to be powered by small, long-lasting power sources such as batteries or energy-harvesting devices, significantly extending operational life.
Solution Approach 2:
The sensor uses energy-harvesting devices to generate its own power, making it self-sufficient. The low-power receiver and modulation circuitry can be powered by harvested energy from the environment, eliminating the need for replaceable batteries and enabling indefinite operation.
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
This approach extends the battery life of wireless sensors by minimizing power consumption during data communication and allows for efficient data transmission from multiple sensors using a single wave, suitable for applications like aircraft monitoring without the need for frequent battery replacements.
Implementation Method 1
The first Sterba Curtain is configured to receive at least a first incident electromagnetic wave
Implementation Method 2
the antenna array is switched between a first state in which the antenna array reflects a greater portion of the modulated incident wave than a transmitted portion
Data Source
AI summary
A system comprises a first sensing device, a first Sterba Curtain, and a first modulating device communicatively coupling the first sensing device to the first Sterba Curtain. The first sensing device is configured to sense at least a first parameter. The first Sterba Curtain is configured to receive at least a first incident electromagnetic wave and to selectively transmit and reflect portions of the first incident electromagnetic wave. The first modulating device is configured to selectively convey a first signal representing the first parameter by modulating at least one of a first transmitted component of the first incident electromagnetic wave and a first reflected component of the first incident electromagnetic wave.