Ring Antenna Layout for Multi-Frequency Timepiece Reception
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Solution Overview
Problem
In small electronic devices like electronic timepieces, reducing the space between components to make them smaller and lighter compromises reception sensitivity of antennas, especially when receiving radio waves with different frequencies.
Innovation Solution
The antenna apparatus includes a ring-shaped antenna element, a grounding conductive plate, and conductive members positioned to adjust the electric capacitance and frequency reception by dividing the antenna into regions with different spreading widths and electric capacitance characteristics, allowing it to receive multiple frequencies with a single antenna element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the space between components is reduced to make the electronic device smaller and lighter, then the device size and weight are improved, but the reception sensitivity of the antenna deteriorates
Solution Approach 1:
The patent applies local quality by creating different spreading widths in different angular regions around the antenna element. The first region has a first spreading width while the second region has a second spreading width different from the first, allowing different parts of the antenna structure to have different electromagnetic characteristics optimized for their specific functions
Solution Approach 2:
The patent segments the space around the antenna element into multiple angular regions (first region and second region) with different spreading widths. This segmentation allows independent optimization of each region's electromagnetic properties without affecting the overall compact structure of the device
2Device complexity
If a single antenna element is used to receive multiple frequencies, then the device complexity is reduced, but the reception sensitivity for different frequencies deteriorates
Solution Approach 1:
The patent creates different local electromagnetic environments by establishing distinct spreading widths in different angular regions. This allows a single antenna element to present different effective areas and capacitance characteristics to different frequency signals arriving from different directions, enabling multi-frequency reception with optimized sensitivity for each frequency
Solution Approach 2:
The patent makes the single antenna element universal by configuring it to receive multiple frequencies (first frequency and second frequency) simultaneously. The different spreading widths in different regions enable the same antenna structure to function effectively across multiple frequency bands without requiring separate antennas for each frequency
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 enhances reception sensitivity and efficiency, enabling the device to receive radio waves across a range of frequencies without increasing size or weight, utilizing existing components for flexible frequency adjustment.
Implementation Method 1
the conductive member is provided in a position in which a spreading width from the center position in a distance direction are made different between the first region and the second region by the antenna element and the conductive member
Implementation Method 2
an antenna apparatus... a ring-shaped antenna element positioned on a first plane... enabling the device to receive radio waves across a range of frequencies
Data Source
AI summary
An antenna apparatus includes, a ring-shaped antenna element positioned on a first plane; a grounding conductive plate positioned on a second plane parallel to the antenna element; a conductive member that is positioned on a side farther from a center position of the first plane enclosed by an outer periphery of the antenna element; and a power supply terminal. The power supply point is positioned in a predetermined nearby range from a boundary between a first region and a second region that include first and second angle ranges symmetrical with relation to the center position. The conductive member is positioned in at least one of the first region and the second region, and is provided in a position in which a spreading width from the center position in a distance direction are made different between the first region and the second region by the antenna element and the conductive member.