Wireless IC Device Power Supply Circuit Substrate
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Solution Overview
Problem
Existing wireless IC devices for UHF-band RFID systems face challenges in expanding their frequency band without increasing the size of the power supply circuit substrate, which becomes complicated and requires additional coil and capacitor elements for isolation.
Innovation Solution
A wireless IC device with a power supply circuit substrate that includes a first coil element connected in series and a second coil element connected in parallel with the wireless IC element, where the winding axes of both coils coincide and their magnetic fields are opposite, allowing for efficient coupling and resonance across a wide frequency band while minimizing the substrate size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the frequency band is expanded by adding more coil and capacitor elements, then the frequency band coverage is improved, but the power supply circuit substrate size increases
Solution Approach 1:
The patent combines multiple coil elements (first coil element L1 and second coil element L2) into a single integrated power supply circuit substrate. The coils are wound such that their winding axes coincide and magnetic fields are opposite, creating a merged structure that provides wide frequency band coverage without requiring separate isolated elements, thus avoiding substrate size increase
Solution Approach 2:
The power supply circuit substrate is designed to perform multiple functions simultaneously: it provides power supply, achieves impedance matching, and enables wide frequency band operation through the specific coil configuration. This multi-functionality eliminates the need for additional separate components that would increase substrate size
2Adaptability or versatility
If more coil and capacitor elements are added to expand frequency band, then the frequency adaptability is improved, but the device complexity increases
Solution Approach 1:
Multiple functional elements are merged into a unified coil structure where the first and second coil elements are integrated on the same substrate with specific winding arrangements. This merging reduces the number of separate components and isolation requirements, thereby reducing device complexity while maintaining frequency band adaptability
Solution Approach 2:
The patent achieves frequency band expansion by changing the parameters of existing coil elements (winding axes alignment, magnetic field orientation) rather than adding more elements. This parameter-based approach simplifies the device structure compared to element-proliferation approaches
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 configuration enables transmission and reception of high-frequency signals across a wide frequency band with a reduced power supply circuit substrate size, enhancing the device's communication capabilities and reducing its overall size.
Implementation Method 1
a first coil element L1 connected in series with the wireless IC element 50, and a second coil element L2 connected in parallel with the wireless IC element 50. The first coil element L1 and the second coil element L2 are wound and arranged such that winding axes of the first and second coil elements coincide or substantially coincide with each other and directions of magnetic fields generated in the respective first and second coil elements are opposite to each other
Data Source
AI summary
A wireless IC device includes a wireless IC element, a power supply circuit substrate including a laminate of a plurality of base layers and a power supply circuit connected to the wireless IC element, and a radiating element connected to the power supply circuit. The power supply circuit includes a first coil element connected in series with the wireless IC element, and a second coil element connected in parallel with the wireless IC element. The first coil element and the second coil element are wound and arranged such that winding axes of the first and second coil elements coincide or substantially coincide with each other and directions of magnetic fields generated in the respective first and second coil elements are opposite to each other.