Cable Antenna Exposed-Part Layout for Omnidirectional Tag Reading
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Solution Overview
Problem
Handheld radio communication reader devices emit electromagnetic waves with directivity and have a complex structure, limiting their ability to radiate in all directions effectively.
Innovation Solution
A cable antenna with an exposed part formed by removing the outer conductor, bent in a serpentine shape, and configured to have a specific length and opening arrangement to radiate electromagnetic waves in all directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a handheld radio communication reader device is used, then the structure is relatively complicated, but the electromagnetic wave radiation coverage is limited due to directivity
Solution Approach 1:
The antenna is segmented into multiple sections with different configurations: a first section with parallel outer and inner conductors, a second section with the inner conductor removed, and a third section with the outer conductor removed. This segmentation allows each section to contribute differently to electromagnetic wave radiation, achieving omnidirectional coverage while maintaining structural simplicity.
Solution Approach 2:
The antenna structure transitions from a two-dimensional planar configuration to a three-dimensional spatial configuration by removing conductors in specific sections and creating exposed portions that radiate electromagnetic waves in multiple directions simultaneously, thereby achieving omnidirectional coverage.
2Adaptability or versatility
If the outer conductor is removed to form an exposed part, then electromagnetic waves can be radiated in all directions, but the manufacturing precision requirements increase
Solution Approach 1:
The antenna structure applies local quality by having different configurations in different sections: the first section maintains both conductors for signal transmission, the second section removes only the inner conductor for partial exposure, and the third section removes only the outer conductor for electromagnetic wave radiation. This localized differentiation achieves omnidirectional radiation while controlling manufacturing complexity.
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
The cable antenna efficiently radiates electromagnetic waves in all directions, enabling effective communication with radio communication tags arranged around it, simplifying the structure and reducing manufacturing costs.
Implementation Method 1
an end part of which is connected to an oscillator that supplies a high-frequency current... The cable antenna efficiently radiates electromagnetic waves in all directions
Data Source
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AI summary
A cable antenna according to the present invention is a cable antenna an end part of which is connected to an oscillator that supplies a high-frequency current, including: an inner conductor extending in a cable-like configuration; an insulating layer covering the inner conductor; and an outer conductor covering the insulating layer, wherein only one exposed part is formed in a middle part of the cable antenna in a longitudinal direction, the exposed part being formed by removing at least the outer conductor, a distance L between a tip end of the cable antenna and an end of the exposed part on a side closer to the tip end is an odd multiple of a quarter of a wavelength λ of the high-frequency current, the multiplier being three or greater, and a length G of the exposed part in the longitudinal direction satisfies the following formula (1). λ/20≤G<λ/4 λ: wavelength (mm) of the high-frequency current.