Folded Coaxial Cable Antenna for Dual-Frequency Reception
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Solution Overview
Problem
Conventional antennas require dedicated antenna elements to receive radio waves, limiting their simplicity and versatility.
Innovation Solution
A cable antenna configuration using a coaxial wire with a folded structure, where the first and second conductors of specific lengths resonate at different frequencies, eliminating the need for a dedicated antenna element and allowing for miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antenna with a dedicated antenna element is used, then radio waves can be received reliably, but the antenna structure becomes complex and the antenna length increases
Solution Approach 1:
The invention extracts and eliminates the dedicated antenna element from the conventional antenna structure. The coaxial cable itself serves as the antenna, with the inner conductor and outer shield forming the radiating elements. This extraction of the dedicated antenna component simplifies the overall structure while maintaining reception functionality through the cable's inherent conductive properties
Solution Approach 2:
The coaxial cable serves multiple functions simultaneously: it acts as both the transmission line for signals and the antenna element for receiving radio waves. The inner conductor and outer shield of the cable form a dipole-like structure that can receive radio waves directly, eliminating the need for separate antenna components and achieving multi-functionality in a single component
2Reliability
If a conventional antenna with a dedicated antenna element is used, then radio waves can be received, but the antenna length becomes longer
Solution Approach 1:
The invention changes the electrical parameters of the antenna system by utilizing the characteristic impedance and distributed capacitance of the coaxial cable. The cable's electrical length, rather than physical length, determines reception effectiveness. This parameter change allows the antenna to achieve resonant conditions at desired frequencies with shorter physical dimensions compared to conventional antennas
3Device complexity
If the antenna structure is simplified without a dedicated antenna element, then the mechanism becomes simpler and easier to handle, but the ability to receive radio waves may be compromised
Solution Approach 1:
The coaxial cable serves itself as the antenna element, utilizing its own conductive structure (inner conductor and outer shield) to receive radio waves. The cable's inherent electrical properties—its conductivity, capacitance, and impedance—enable it to function as both transmission line and antenna without requiring additional dedicated components, achieving self-sufficiency in the antenna function
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 antenna can receive both low and high-frequency radio waves with a simpler configuration, reducing the necessary antenna length and improving flexibility in frequency reception.
Implementation Method 1
a first received signal with a first frequency is received by a conductor with a first antenna length corresponding to a length of the first line length and the second line length combined. Further, a second received signal with a second frequency is received by a conductor with a second antenna length corresponding to one of the first line length and the second line length
Data Source
AI summary
An antenna is realized by a simple mechanism without use of a dedicated antenna element. An antenna includes a first conductor 2b (2d) that has a first line length from a start point 4 to a folded point 3; and a second conductor 2b (2d) that has a second line length in a direction from the folded point 3 to the start point 4 and is electrically connected to the first conductor at the folded point 3. A first received signal with a first frequency is received with a first antenna length including both the first line length and the second line length. A second received signal with a second frequency is received with a second antenna length including only one of the first line length and the second line length.