Dielectric Case Antenna Structure for Corrosion-Resistant Reception
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Solution Overview
Problem
Conventional electronic devices with external antennas face issues of oxidation and corrosion due to exposure to open air, necessitating accommodation inside the device, which can compromise antenna performance.
Innovation Solution
An antenna design with a top plate and side wall, housed within a dielectric device case made of resin materials, featuring a bezel with discontinuous metal deposition and a dielectric environment to enhance protection and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna is made of metal and exposed to open air, then the antenna can effectively radiate and receive radio waves, but the antenna is susceptible to oxidation and corrosion leading to performance degradation
Solution Approach 1:
A resin layer is introduced as an intermediary substance between the metal antenna and the external environment. This resin layer acts as a protective barrier that prevents direct contact between the metal antenna and corrosive elements in the air, while still allowing the antenna to function. The antenna is embedded in the resin, which provides both mechanical support and environmental protection.
Solution Approach 2:
The device case is constructed as a composite material structure combining resin and metal components. The resin portion provides corrosion resistance and houses the antenna, while metal portions (such as the bezel with discontinuous metal deposition) provide structural strength and aesthetic appearance. This composite approach allows each material to contribute its advantageous properties.
2Reliability
If the antenna is accommodated inside the device case, then the antenna is protected from oxidation and corrosion, but the antenna size and configuration may be constrained
Solution Approach 1:
The antenna is designed with a three-dimensional structure that extends in multiple directions within the constrained space of the device case. The antenna includes a vertical extending portion that protrudes from the front surface of the case, utilizing the depth dimension of the case to achieve adequate antenna length and radiation characteristics without requiring excessive planar space.
Solution Approach 2:
The antenna is divided into multiple segments or portions with different functions and orientations. It includes a horizontal loop portion for GPS signal reception and a vertical extending portion for enhanced radiation. This segmentation allows each portion to be optimized for its specific function while fitting within the overall device case constraints.
3Strength
If a metallic bezel is used to provide shock resistance and metallic appearance, then the device gains strength and aesthetic quality, but the metal may interfere with radio wave reception
Solution Approach 1:
The bezel is designed with discontinuous metal deposition rather than a continuous metal layer. Metal portions are strategically placed to provide structural strength and metallic appearance at specific locations, while leaving gaps or non-metallic portions in areas where radio wave transmission is critical. This localized application of metal allows the bezel to provide shock resistance without creating complete radio wave blocking barriers.
Solution Approach 2:
The bezel incorporates a resin base layer that serves as a flexible, non-conductive substrate. This resin film provides the primary structural support and radio wave transparency, while thin metal deposits are applied only where needed for aesthetic appearance and localized reinforcement, minimizing radio wave interference.
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 design minimizes corrosion, maintains antenna performance, and allows for miniaturization while ensuring efficient radio wave reception in desired frequency bands.
Implementation Method 1
a device case including a dielectric and accommodating at least the side wall of the antenna
Implementation Method 2
a bezel with a metallic appearance created by discontinuous metal deposition on a resin base
Data Source
AI summary
Disclosed is an electronic device including an antenna and a device case. The antenna has a top plate and a side wall. The top plate is annular in a plan view from a first direction and has at least an outer peripheral edge and an inner peripheral edge. The side wall is connected to at least a part of the top plate and extending along the first direction. The device case includes a dielectric and accommodating at least the side wall of the antenna.