Antenna Unit Between Circuit Board and Battery
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Solution Overview
Problem
Conventional electronic devices worn by humans or animals face challenges in reducing size while maintaining transmission and reception performance due to the impedance effects of LCD panels and flat cables on reception antennas, limiting display capacity and design flexibility.
Innovation Solution
The electronic device incorporates a planar-shaped dielectric layer with a first conductive layer at ground potential and a second conductive layer at signal potential, separated by the dielectric layer, allowing the antenna unit to be disposed between the circuit board and battery, thus maximizing display space and minimizing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna unit is disposed near the surface of the outside case to receive signals, then reception performance is improved, but the display unit size is limited and device design is constrained
Solution Approach 1:
The patent transitions the antenna unit from a two-dimensional surface placement to a three-dimensional stacked configuration between the circuit board and battery. This vertical arrangement frees up surface area on the outside case, allowing the display unit to occupy substantially the entire top side of the device while the antenna maintains its reception function through its stacked position.
Solution Approach 2:
The antenna unit is nested within the device structure between the circuit board and battery, utilizing the internal three-dimensional space rather than occupying surface area. This nesting approach allows multiple components (display, circuit board, antenna, battery) to be arranged in layers, maximizing space utilization and enabling a larger display while preserving antenna functionality.
2Ease of manufacture
If LCD panel or flat cable is connected to reception antenna side, then device assembly is simplified, but impedance fluctuates and radiation efficiency degrades
Solution Approach 1:
The patent extracts the antenna unit from the reception antenna side and relocates it to the opposite side between the circuit board and battery. This separation removes the harmful influence of the LCD panel and flat cable on the antenna's electromagnetic field, preventing impedance fluctuations and maintaining radiation efficiency while still allowing for practical device assembly.
Solution Approach 2:
The circuit board serves as an intermediary layer between the LCD panel and the antenna unit. By positioning the antenna on the opposite side of the circuit board from the LCD panel, the circuit board acts as a physical and electromagnetic barrier that isolates the antenna from the impedance-affecting components, thereby maintaining radiation efficiency.
3Volume of stationary object
If components are disposed side by side on a flat surface to reduce device size, then packaging density increases, but display information capacity is limited and exterior design is constrained
Solution Approach 1:
The patent employs a three-dimensional stacked arrangement of components vertically between the outside case and back cover, rather than disposing them side by side on a flat surface. This vertical layering (display unit on top side, circuit board, antenna unit, and battery in stacked positions) maintains compact device volume while maximizing the display area on the available surface.
Solution Approach 2:
The device is segmented into distinct functional layers: the display unit occupies the top side surface area, while the circuit board, antenna unit, and battery are segmented into separate vertical positions between the case and back cover. This segmentation allows each component to occupy its optimal space, enabling both compact overall size and large display area.
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 a compact electronic device with enhanced antenna performance, allowing for larger information display and easier battery replacement, while maintaining efficient electromagnetic field distribution and reducing the impact of body wear on operation.
Implementation Method 1
an antenna unit that does at least one of transmitting and receiving radio waves, is disposed on the opposite side of the circuit board as the display unit, and includes a planar-shaped dielectric layer, a first conductive layer disposed on one side of the dielectric layer, and a second conductive layer disposed on the other side of the dielectric layer
Data Source
AI summary
A small electronic device enables improving transmission and reception performance with stable operation. An example of the electronic device is an electronic wristwatch having a display; a circuit board disposed on one side of the display; an antenna is disposed on the opposite side of the circuit board as the display, and includes a dielectric layer, a ground conductor disposed on one side of the dielectric layer, and a radiating conductor disposed on the other side of the dielectric layer. The ground conductor is disposed on the surface of the dielectric layer on the side near the circuit board, and is connected to the ground potential of the circuit board. The radiating conductor is disposed on the surface of the dielectric layer on the side far from the circuit board, and is connected to the signal potential of the circuit board.