Antenna Integration on Display Surface for Compact Circular Polarization
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Solution Overview
Problem
Existing electronic apparatuses face challenges in miniaturization and thinning due to the large volume occupied by circularly polarized wave antennas, which also restrict design freedom and increase complexity and cost, especially in thin timepieces where antenna performance is compromised.
Innovation Solution
An electronic apparatus design that utilizes a metal structural component as part of the antenna, electromagnetically coupled with a power-fed element and a GND plate, allowing for a shorter equivalent electrical length and improved radiation efficiency, thereby reducing the volume and complexity of the antenna system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ring antenna or patch antenna using dielectric is used to achieve circularly polarized wave reception, then reception sensitivity is improved, but the occupied volume increases and the apparatus becomes larger
Solution Approach 1:
The patent merges the antenna elements with the display structure by forming conductive patterns directly on or integrated with the display surface. The first element is formed on the display surface and the second element is formed below it, combining the display and antenna functions into a single integrated structure, thereby eliminating the need for separate dielectric antenna components and reducing overall volume.
Solution Approach 2:
The patent transitions from traditional planar antenna designs to a three-dimensional stacked configuration where antenna elements are arranged in multiple layers (first element on display surface, second element below it, GND plate at the bottom). This vertical stacking in the thickness direction enables compact antenna design while maintaining effective radiation area and reception sensitivity.
2Reliability
If a ring antenna is attached to the outer case, then antenna function is achieved, but conduction structure and waterproofing measures are required increasing structure complexity and cost
Solution Approach 1:
The patent merges the antenna conduction structure with the display internal structure by forming conductive patterns directly on the display surface and below it. The first element on the display surface and the second element below it are electrically connected through the display structure itself, eliminating the need for separate conduction structures and waterproofing measures that would be required if the antenna were attached to the outer case.
Solution Approach 2:
The display structure itself serves dual functions: as the display medium and as the antenna support structure. The conductive elements are formed using the display's own structural components, making the display structure self-sufficient for both display and antenna functions without requiring additional external conduction paths or waterproofing interventions.
3Reliability
If a patch antenna is disposed outside the outer case, then antenna function is achieved, but the design freedom is reduced and projection from case is required
Solution Approach 1:
The patent merges the antenna completely within the display structure by forming conductive elements on and below the display surface. This integration eliminates the need for external antenna projections from the case, allowing the antenna to be fully incorporated into the device's internal architecture and maximizing design freedom for various form factors and configurations.
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 enables miniaturization and improved radiation efficiency of the antenna, allowing for better reception of radio waves, including GPS, while reducing the number of dedicated antenna components and maintaining design flexibility.
Implementation Method 1
the first element and the second element are electromagnetically coupled and the equivalent electrical lengths of the first element and the second element are shorter than a 1/4 wavelength
Data Source
AI summary
An electronic apparatus includes a display; and an antenna including a first element without power feeding that is a structural component made of metal and is disposed on the display or above a display surface of the display in a display direction, a second element which is disposed below the first element and is connected to a power supply, and a GND plate that is disposed below the second element, wherein the first element and the second element are electromagnetically coupled.