Single Antenna RFID Circuit with MEMS Switching
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Solution Overview
Problem
The complexity of electronic device circuitry increases with the need to communicate with multiple networks, leading to bulky designs and communication degradation due to electromagnetic interference from multiple antennas, which are not suitable for modern small devices.
Innovation Solution
Employing a single antenna for both wide area network and RFID communication using a MEMS switch that defaults to the RFID circuit when powered off and switches to the communication circuit when powered on, allowing efficient use of a single antenna for both functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are used for different network communications, then communication capability with multiple networks is improved, but device complexity and electromagnetic interference increase
Solution Approach 1:
The patent implements a universal antenna system where a single antenna structure serves multiple communication networks (cellular, RFID, etc.) through a shared antenna port and switching mechanism, eliminating the need for separate antennas for each network type while maintaining full communication capability across all networks
Solution Approach 2:
The patent merges multiple antenna functions into a single physical antenna by combining the antenna element, feed network, and switching matrix into an integrated structure that can dynamically allocate the single antenna to different communication circuits based on operational requirements
2Adaptability or versatility
If multiple antennas are used for different network communications, then communication capability with multiple networks is improved, but electromagnetic interference occurs
Solution Approach 1:
The patent extracts the antenna function from multiple separate antenna structures and consolidates it into a single shared antenna, thereby eliminating the electromagnetic interference that would arise from having multiple antennas operating simultaneously in close proximity
Solution Approach 2:
The patent introduces a switching matrix as an intermediary component that controls the connection between the single antenna and different communication circuits, ensuring that only one circuit accesses the antenna at a time and preventing electromagnetic interference between simultaneous transmissions
3Device complexity
If a single antenna is used for both communication circuits, then device complexity is reduced, but antenna switching control is required
Solution Approach 1:
The patent implements self-service switching control where the system automatically determines which communication circuit should access the antenna based on operational state, eliminating the need for manual intervention or complex external control mechanisms while maintaining efficient antenna allocation
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 solution simplifies device design, reduces electromagnetic interference, and conserves battery power by using a single antenna for both communication types, enhancing device functionality and user experience.
Implementation Method 1
a MEMS switch to selectively couple the single antenna to one of the communication circuit or the RFID circuit
Data Source
AI summary
An electronic device (200) includes a single antenna (211), a communication circuit (202), and a RFID circuit (207). A switch (212) selectively couples the single antenna to one of the communication circuit or the RFID circuit. For example, the RFID circuit can be coupled to the single antenna when the electronic device is OFF, and the communication circuit can be coupled to the single antenna when the electronic device is ON. Accordingly, RFID information can be received from an RFID communication device when the electronic device is OFF. When the electronic device is ON, an interrupt can cause the switch to connect the RFID circuit to the single antenna, sometimes only for less than a predetermined duration.