Antenna Conductive Patterns for Parasitic Resonance Control
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Solution Overview
Problem
Portable electronic devices with large-screen touch displays face challenges in antenna performance due to reduced distance between the conductive plate and antenna, leading to parasitic resonance and degraded radiation performance, especially when trying to operate in multiple frequency bands.
Innovation Solution
The design includes a housing with a front plate, rear plate, and side surface member, featuring a conductive pattern between the display and rear plate, and a second conductive pattern between the printed circuit board and front plate, with the conductive plate of the display electrically connected to the printed circuit board's conductive layer to prevent parasitic resonance, allowing efficient operation in multiple bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display area is increased to improve visibility and manipulation convenience, then the user interface quality is improved, but the distance between the conductive plate and antenna is reduced causing parasitic resonance and degraded radiation performance
Solution Approach 1:
The antenna system is segmented into multiple functional components: a first conductive pattern for primary radiation, a second conductive pattern for parasitic resonance control, and a conductive plate for heat dissipation and noise blocking. This segmentation allows each component to perform its specific function independently while working together to resolve the contradiction between large display area and antenna performance.
Solution Approach 2:
The second conductive pattern acts as an intermediary element between the first conductive pattern and the conductive plate. It is positioned to prevent parasitic resonance caused by the conductive plate while allowing the display to maintain its large area. This intermediary structure mediates the interaction between the conductive plate and antenna, eliminating the harmful parasitic effects.
2Device complexity
If a single conductive pattern is used for the antenna to simplify the structure, then the device complexity is reduced, but it becomes difficult to implement multi-band operation due to the presence of the conductive plate
Solution Approach 1:
The antenna system achieves multi-functionality by incorporating multiple conductive patterns that serve different purposes. The first conductive pattern handles primary signal radiation across multiple bands, while the second conductive pattern specifically addresses parasitic resonance suppression. This multi-functional design enables the antenna to operate efficiently in multiple frequency bands despite the presence of the conductive plate.
Solution Approach 2:
The solution transitions from a two-dimensional planar conductive pattern to a three-dimensional multi-layer conductive structure. The first and second conductive patterns are positioned at different heights and locations, creating a spatial arrangement that enables multi-band operation. This dimensional expansion allows the antenna system to achieve versatility without excessive complexity.
3Length of stationary object
If the conductive plate is positioned close to the antenna to maintain a slim device profile, then the portability is improved, but parasitic resonance is formed degrading the antenna performance
Solution Approach 1:
The second conductive pattern serves as an intermediary barrier between the conductive plate and the first conductive pattern. It is strategically positioned to interrupt the parasitic resonance paths that would otherwise form between the conductive plate and antenna, allowing the device to maintain its slim profile without sacrificing antenna performance.
Solution Approach 2:
The second conductive pattern, which could be seen as an additional complexity, actually converts the harmful parasitic resonance effect into a beneficial outcome by actively suppressing it. The presence of this additional conductive element transforms the potential harm of close spacing into a controlled and managed interaction that improves overall antenna performance.
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 configuration enhances antenna performance by preventing parasitic resonance and enabling efficient operation across multiple frequency bands, improving radiation efficiency and design aesthetics.
Implementation Method 1
a conductive plate disposed on the back surface thereof in order to radiate heat or to block noise
Implementation Method 2
a conductive plate disposed on the back surface thereof in order to radiate heat or to block noise
Implementation Method 3
a wireless communication circuit electrically connected to the first conductive pattern and the second conductive pattern and configured to transmit and/or receive a signal having a designated frequency
Implementation Method 4
parasitic resonance may be formed by the conductive plate disposed on the periphery, thereby degrading the antenna performance
Data Source
AI summary
According to various embodiments, an electronic device may comprise: a housing comprising a front plate, a rear plate facing in the opposite direction to the front plate, and a side surface member surrounding the space between the front plate and the rear plate, the side surface member comprising a first side surface extending in a first direction and having a first length, a second side surface extending in a second direction perpendicular to the first direction and having a second length larger than the first length, a third side surface extending in parallel with the first side surface and having the first length, and a fourth side surface extending in parallel with the second side surface and having the second length; a display arranged between the front plate and the rear plate, at least a partial area of the display being exposed through the front plate, the display comprising a conductive plate; a printed circuit board arranged between the display and the rear plate, the printed circuit hoard comprising at least one conductive layer, the conductive plate and the conductive layer being electrically connected to each other; a first conductive pattern arranged between the printed circuit board and the rear plate; a second conductive pattern arranged between the printed circuit board and the front plate and, when seen from above the front plate, between the first side surface of the side surface member and the conductive plate; and a wireless communication circuit electrically connected to the first conductive pattern and the second conductive pattern and configured to transmit and/or receive a signal having a designated frequency. Various other embodiments may be possible.


