LC Resonant Antenna Vertical Capacitor Layer
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Solution Overview
Problem
Conventional LC resonant antennas experience significant variation in capacitance due to changes in electrode plate distance, leading to variations in resonant frequency, making them unreliable for consistent communication characteristics.
Innovation Solution
The LC resonant antenna design includes a dielectric layer with a coil-shaped inductor and a capacitor layer where the capacitor's electrode plates are arranged in parallel with a larger overlapping area, allowing for a larger distance between them, reducing the impact of manufacturing variations and enhancing magnetic flux passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If capacitance electrodes are arranged at extremely small intervals in the laminating direction to fit the capacitance element in limited area, then the capacitance element capacity can be ensured, but manufacturing variation in electrode plate distance significantly affects capacitance, causing great variation in resonant frequency
Solution Approach 1:
The patent repositions the capacitance element from a lateral arrangement (side by side with inductor in surface direction) to a vertical arrangement (above the inductor in laminating direction). This dimensional change allows the capacitance element to be mounted in the third dimension (laminating direction) rather than competing for surface area, thereby increasing the distance between electrode plates and reducing manufacturing variation impact while maintaining adequate capacitance element capacity.
2Volume of moving object
If capacitance element is placed in limited area with electrodes at small intervals, then the antenna size is constrained, but capacitance variation increases significantly
Solution Approach 1:
By moving the capacitance element to the vertical dimension (laminating direction) above the inductor, the patent enables larger electrode plate separation without increasing the lateral footprint of the antenna. This maintains compact overall antenna size while significantly improving capacitance consistency by reducing the impact of manufacturing tolerances on electrode distance.
3Area of stationary object
If electrode plates are arranged closer together to reduce capacitance element area, then area is reduced, but capacitance becomes highly sensitive to distance variation
Solution Approach 1:
The patent utilizes the laminating direction (vertical dimension) to position the capacitance element above the inductor, allowing sufficient distance between electrode plates while keeping the capacitance element area compact. This vertical arrangement reduces sensitivity to distance variation because the larger absolute distance makes the same manufacturing tolerance represent a smaller relative variation.
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 minimizes capacitance variation, stabilizes resonant frequency, and improves communication stability by allowing a larger distance between electrode plates while maintaining consistent capacitance, resulting in more reliable communication characteristics across manufactured antennas.
Implementation Method 1
the inductor is suitable for being electromagnetically coupled to an on-chip antenna of the IC chip (C) or a feed coil comprising IC chip (C) and a coil
Implementation Method 2
the capacitor includes a pair of electrode plates arranged in parallel at a distance from each other
Implementation Method 3
LC resonant antenna capable of suppressing variation in the capacitance of a capacitor
Data Source
Figure 1
Figure 2
Figure 3A~3G
AI summary
Provided is an LC resonant antenna including: an inductor layer provided with a coil-shaped inductor; and a capacitor layer laminated on the inductor layer in a direction of an axis along a coil center of the inductor. The capacitor layer includes a capacitor connected to the inductor. The capacitor includes a pair of electrode plates arranged in parallel at a distance from each other in a laminating direction.