Antenna with Integrated Capacitor for ESD Protection
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Solution Overview
Problem
Electronic devices with metallic housings face electric shock hazards and electrostatic discharge (ESD) issues due to exposed metal, which can be exacerbated by damage to protective layers, and existing antenna designs with multiple capacitors increase costs and space requirements while being prone to damage and performance degradation.
Innovation Solution
An antenna design that incorporates a radiator with a metallic housing, a clip acting as a conductor, and a capacitor with an adhesive dielectric, where the metallic housing serves as a conductor, effectively blocking direct current and preventing electric shock and ESD by using a single capacitive component that can withstand impacts and maintain performance across frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple capacitive components are used in the antenna design, then the ESD protection and electric shock prevention are improved, but the device complexity, cost, and space requirements increase
Solution Approach 1:
The patent combines multiple capacitive components into a single integrated capacitor that provides both ESD protection and electric shock prevention functions. The capacitor is formed by using the metallic housing as one electrode and a conductive component (such as a feed antenna or ground connection) as the other electrode, with a dielectric layer between them. This merging approach maintains the reliability benefits of multiple capacitors while reducing device complexity, cost, and space requirements.
Solution Approach 2:
The single capacitor in the patent serves multiple functions simultaneously: it provides ESD protection, prevents electric shock hazards, and maintains antenna performance. The metallic housing serves dual purposes as both the structural enclosure and one electrode of the capacitor. This multi-functionality eliminates the need for separate components for each protection function, thereby reducing overall device complexity.
2Object-affected harmful factors
If a protective layer is formed on the metallic housing through post-processing, then the electric shock hazard is prevented, but the electrostatic discharge (ESD) issue can still occur and the protective layer may be damaged
Solution Approach 1:
The patent introduces a dielectric layer as an intermediary between the metallic housing (one electrode) and the conductive component (other electrode). This dielectric layer serves as both the insulation layer for preventing electric shock and the capacitor dielectric for ESD protection. By forming the capacitor structure this way, the system achieves both protection functions without relying on separate protective layers that can be damaged.
Solution Approach 2:
The metallic housing serves dual purposes: as the structural enclosure of the device and as one electrode of the capacitor. The conductive component (feed antenna or ground connection) also serves its primary function while simultaneously acting as the other capacitor electrode. This self-service approach eliminates the need for additional separate protective components, reducing complexity while maintaining both ESD and electric shock protection.
3Productivity
If the metallic housing is used as part of the antenna radiator, then the antenna performance is improved, but the electric shock hazard and ESD issues are exacerbated
Solution Approach 1:
The patent merges the antenna radiator function with the capacitor electrode function. The metallic housing serves as both the radiator for antenna operation and one electrode of the capacitor for protection functions. The dielectric layer and other capacitor components are integrated into the antenna structure, allowing simultaneous achievement of high antenna performance and effective ESD/electric shock protection without adding separate bulky components.
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 solution effectively prevents electric shock and ESD while reducing costs and space requirements by utilizing a single capacitive component that maintains performance across frequency bands and withstands impacts, enhancing the safety and efficiency of electronic devices.
Implementation Method 1
the dielectric includes an adhesive that affixes positions of the first conductor and the second conductor in parallel with each other
Implementation Method 2
a capacitor connected between the radiator and the ground part
Implementation Method 3
effectively blocking direct current and preventing electric shock and ESD
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
An antenna for an electronic device is disclosed that can reduce or prevent problems such as a shock hazard and/or an Electrostatic Discharge (ESD) issue, particularly in the case when device are subjected to impact such as being dropped. The antenna includes a radiator; an antenna clip connected with a metallic housing of the electronic device; a capacitor includes a part of the antenna clip; and a feeding part and a ground for operating the antenna.