Multiband Antenna High-Impedance Grounding Coupling Capacitor
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Solution Overview
Problem
The challenge in designing a multiband antenna for mobile devices is the difficulty in integration due to limited space and the radiating loss caused by metal components, which complicates manufacturing and increases costs.
Innovation Solution
A multiband antenna system comprising a conducting element connected to the device's ground via high impedance, a supporting element with a vertical surface, and a radiating element that forms a coupling capacitor with the conducting element, allowing the antenna to operate effectively across multiple bands while minimizing interference from metal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a PIFA antenna is configured in the mobile device, then the antenna can be integrated into the device, but the antenna dimension becomes large and difficult to integrate
Solution Approach 1:
The antenna is divided into multiple segments including a radiating element, a feeding element, and a grounding element. Each segment serves a specific function and can be independently optimized. The radiating element includes multiple radiating sections that can be separately designed for different frequency bands, allowing the antenna to achieve multiband operation without increasing overall size.
Solution Approach 2:
The antenna structure is nested within the mobile device housing. The radiating element is positioned between the first and second housing components, utilizing the device's internal space efficiently. The grounding element is integrated with the device housing, and the feeding element connects the radiating element to the communication module, creating a compact nested arrangement that minimizes the antenna's volume footprint.
2Adaptability or versatility
If additional switches or biasing circuits are added for multiband operation, then the antenna can operate at multiple bands, but the manufacture becomes more complicated and cost increases
Solution Approach 1:
The antenna structure is designed to operate across multiple frequency bands without requiring additional switching mechanisms or biasing circuits. The radiating element's geometry and the feeding element's configuration enable the antenna to resonate at multiple frequencies simultaneously. The high-impedance connection between the feeding element and grounding element creates artificial impedance transformations that allow single-band antenna structures to achieve multiband operation, eliminating the need for complex additional components.
Solution Approach 2:
The antenna structure uses its own geometric configuration and impedance characteristics to achieve multiband operation. The high-impedance connection formed by the feeding element and grounding element automatically creates the necessary impedance transformations for different bands without requiring external control circuits. The antenna self-adjusts its electrical characteristics based on its physical structure, eliminating the need for external switches or biasing circuits.
3Strength
If metal components are used in the mobile device, then the device structure is strengthened, but the radiating loss of the antenna increases due to electric field concentration
Solution Approach 1:
The feeding element acts as an intermediary between the radiating element and the grounding element. It provides a high-impedance connection that electrically isolates the radiating element from the metal housing components. This intermediary structure prevents direct electric field interaction between the antenna and metal components, reducing parasitic effects and radiating loss while maintaining the structural integrity provided by the metal housing.
Solution Approach 2:
The antenna design creates localized high-impedance regions through the feeding element and grounding element configuration. By concentrating the high-impedance connection in specific locations, the design prevents electric field concentration at critical points where metal components would cause losses. The local impedance control allows the antenna to maintain efficient radiation while coexisting with metal structural components in the device.
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 enables the antenna to operate across multiple bands, reduces radiating loss, and simplifies manufacturing by eliminating the need for additional switches or biasing circuits, thus enhancing communication quality and reducing costs.
Implementation Method 1
The radiating element and the conducting element form a coupling capacitor
Data Source
AI summary
An electronic device includes a conducting element, a supporting element, and a multiband antenna is disclosed. The conducting element is connected to the ground of the electronic device by a high impedance connection. The supporting element has a supporting surface, and the supporting surface and the conducting element are perpendicular. The multiband antenna is disposed at the supporting surface and includes a radiating element, and the radiating element and the conducting element form a coupling capacitor.