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

VSEngineering 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

Engineering Contradiction:
Improvedisplay areaVSAvoidantenna radiation performance
Core Design Contradiction:
Area of stationary objectVSReliability

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.

Inventive Principle:
Principle #1Segmentation

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.

Inventive Principle:
Principle #24Intermediary (Mediator)

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

Engineering Contradiction:
Improveantenna structure complexityVSAvoidmulti-band operation capability
Core Design Contradiction:
Device complexityVSAdaptability or versatility

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.

Inventive Principle:
Principle #6Universality (Multi-functionality)

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.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

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

Engineering Contradiction:
Improvedevice thicknessVSAvoidantenna performance
Core Design Contradiction:
Length of stationary objectVSReliability

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.

Inventive Principle:
Principle #24Intermediary (Mediator)

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.

Inventive Principle:
Principle #22Blessing in disguise (Convert harm into benefit)

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

Methodology Applied
Scientific EffectThermal radiation: Thermal Radiation

Implementation Method 2

a conductive plate disposed on the back surface thereof in order to radiate heat or to block noise

Methodology Applied
Scientific EffectElectromagnetic shielding: Faraday Cage

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

Methodology Applied
Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Implementation Method 4

parasitic resonance may be formed by the conductive plate disposed on the periphery, thereby degrading the antenna performance

Methodology Applied
Scientific EffectParasitic resonance: Resonance

Data Source

PatentUS11522271B2Antenna and electronic device comprising same
Publication Date: 2022.12.06 SAMSUNG ELECTRONICS CO LTD
  • US11522271B2 patent drawing
  • US11522271B2 patent drawing
  • US11522271B2 patent drawing

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.