FM Radio Antenna Sleeve Capacitor Ground Plane Elimination
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Solution Overview
Problem
Existing portable and hand-held FM analog radio receivers experience poor reception due to small size, electromagnetic interference (EMI) from electronics, variability caused by the human body, and the need for a ground plane, which limits their performance and portability.
Innovation Solution
The development of an antenna system that includes a coaxial capacitor configuration using a conductive sleeve surrounding wires, allowing for end-fed sleeve dipole and loop antenna designs that do not require a ground plane, combined with adaptive impedance matching and diversity algorithms to optimize signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional ground plane is used in portable radio receivers, then antenna performance is improved, but device size and weight increase
Solution Approach 1:
The patent extracts and eliminates the ground plane requirement from the antenna system. The end-fed sleeve dipole antenna is designed to operate without a ground plane, removing this heavy component while maintaining reception performance through the sleeve capacitor resonance structure.
Solution Approach 2:
The patent changes the operating parameters of the antenna system by using a sleeve capacitor with specific dimensions (sleeve length 0.03-0.06 lambda, wire diameter ratio 0.003-0.006) to create resonance at the desired frequency, replacing the traditional ground plane approach with a resonant sleeve structure that achieves similar performance without the weight penalty.
2Volume of moving object
If antenna elements are placed close to electronic components in portable devices, then device compactness is improved, but electromagnetic interference increases
Solution Approach 1:
The patent introduces the sleeve capacitor structure as an intermediary between the antenna wire and the surrounding environment. This sleeve acts as a shield and resonant element that isolates the antenna from electromagnetic interference with nearby electronic components while maintaining the compact form factor needed for portable devices.
3Ease of operation
If the antenna structure is simplified for portability, then ease of operation is improved, but reception stability deteriorates due to human body effects
Solution Approach 1:
The patent makes the antenna system dynamic by allowing the sleeve capacitor to be tuned or adjusted. The sleeve dimensions and positioning can be optimized for different operating conditions, enabling the antenna to maintain stable reception performance despite variations caused by human body effects during portable use.
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 solution enhances the reception quality of FM analog and digital radio signals in portable devices by reducing EMI, stabilizing signal strength against human body effects, and enabling portable operation without the need for a ground plane, thereby improving overall performance and user experience.
Implementation Method 1
a conductive sleeve surrounding portions of the first and second pairs of wires, the sleeve forming a coaxial capacitor with the first and second pairs of wires
Data Source
AI summary
An apparatus includes first and second speakers, and an antenna including a first pair of wires connected to the first speaker, a second pair of wires connected to the second speaker, and a conductive sleeve surrounding portions of the first and second pairs of wires, the sleeve forming a coaxial capacitor with the first and second pairs of wires. The apparatus can further include an inductor connected between the first and second pairs of wires and the sleeve, to form a resonant circuit with the coaxial capacitor.