Antenna Device with Loop Radiator and Grounded Metal Edge
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Solution Overview
Problem
The challenge is to enhance antenna performance in portable terminals while minimizing the degrading effect of metal bodies on case frames, which are becoming increasingly common in modern portable devices due to size constraints and the need for efficient wireless communication.
Innovation Solution
The solution involves an antenna device with a main board, a loop radiator, a metal body along the device's edge, and at least one stub, where the loop radiator is connected to the power supply and ground surface, and the metal body is electrically connected to the ground surface, incorporating a slot and radiation plate to improve antenna performance without degrading it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a metal body is mounted on a case frame to reduce device size and improve appearance, then device compactness is improved, but antenna performance deteriorates due to electromagnetic interference
Solution Approach 1:
The patent converts the harmful electromagnetic interference from the metal body into a beneficial effect by electrically connecting the metal body to the ground surface. This grounding approach transforms the metal body from a source of interference into a component that enhances antenna performance by providing a controlled reference potential and improving signal stability.
Solution Approach 2:
The patent introduces an electrical connection (grounding path) as an intermediary between the metal body and the antenna system. This intermediary component mediates the interaction between the metal body and electromagnetic signals, allowing the metal body to coexist with the antenna without degrading performance.
2Reliability
If antenna size is increased to improve communication performance, then antenna performance is improved, but device compactness deteriorates
Solution Approach 1:
The patent merges the antenna structure with the device case frame by utilizing the metal body as part of the antenna system. The loop radiator is configured to work in conjunction with the metal body, effectively combining two components into a unified antenna structure that achieves good performance without requiring additional space.
Solution Approach 2:
The metal body serves multiple functions: it provides structural support for the device, maintains appearance, and acts as part of the antenna system for electromagnetic radiation. This multi-functionality allows the same component to fulfill both mechanical and electromagnetic roles, eliminating the need for separate antenna elements.
3Reliability
If a loop radiator is added to improve antenna performance, then communication capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the loop radiator with the existing metal body structure, creating an integrated antenna system. The loop radiator is positioned and connected to work with the metal body as a unified structure, reducing the need for separate mounting brackets, additional grounding elements, and other auxiliary 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
This configuration enhances antenna performance by minimizing interference from the metal body, allowing for effective communication across multiple frequency bands, as demonstrated by return loss graphs showing resonance within desired frequency ranges.
Implementation Method 1
a loop radiator which is connected with the power supply end of the main board at its one end and is connected with a ground surface of the main board at its other end
Implementation Method 2
a metal body which is disposed along an edge of the portable terminal and is electrically connected with the ground surface of the main board
Data Source
AI summary
An antenna device for improving antenna performance of a portable terminal having a metal edge installed on a case frame is disclosed. The antenna device includes a main board equipped with a power supply end for supplying power and a ground surface for grounding the main board, a loop radiator connected with the power supply end of the main board at first end and connected with the ground surface of the main board at a second end, and a metal body disposed along an edge of the portable terminal and electrically connected with the ground surface of the main board.