Portable Terminal Antenna Using Metal Case Frame
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Solution Overview
Problem
The challenge is to design an antenna apparatus for portable terminals that is light, thin, compact, and cost-effective, while maintaining effective RF communication performance in increasingly limited space, as existing solutions struggle to accommodate multiple elements within the constrained physical structure of modern portable devices.
Innovation Solution
The antenna apparatus incorporates a ground surface and a metal body, such as a metallic case frame, functioning as antenna radiators, with the ground surface of a sub-board and main board electrically connected to a metal case frame, allowing for efficient radiation of radio waves and accommodating various resonant characteristics through adjustable distances and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna radiator size is increased to improve antenna performance, then the antenna performance is improved, but the device size and weight increase
Solution Approach 1:
The patent combines multiple antenna radiators (first and second antenna radiators) into a single integrated antenna apparatus structure. The radiators are merged within the same housing space, sharing common support structures and electrical connection units, thereby achieving improved antenna performance without proportionally increasing device weight
Solution Approach 2:
The antenna apparatus is designed to support multiple frequency bands (first and second frequency bands) using the same physical structure. The housing and support structures serve dual purposes: structural support and antenna radiation functions, eliminating the need for separate antenna systems for different bands
2Reliability
If multiple antenna elements are mounted to improve RF communication capabilities, then the communication capabilities are improved, but the device complexity increases
Solution Approach 1:
Multiple antenna radiators are combined within a single housing structure, sharing common support bars and electrical connection units. This merging approach allows multiple communication elements to coexist while reducing the overall structural complexity compared to having separate antenna assemblies
Solution Approach 2:
The antenna apparatus is segmented into modular components (first and second antenna radiators, support bars, electrical connection units) that can be independently designed and assembled. This segmentation allows for simplified manufacturing and assembly while maintaining multiple communication capabilities
3Reliability
If the antenna radiator size is increased to improve antenna performance, then the antenna performance is improved, but the mounting space availability decreases
Solution Approach 1:
The antenna radiators are arranged in a three-dimensional configuration within the housing, utilizing vertical and lateral spaces efficiently. The support bars extend in multiple directions, allowing the radiators to be positioned in available spaces that would be wasted in traditional two-dimensional layouts
Solution Approach 2:
The antenna radiators are nested within the housing structure, with support bars and electrical connection units integrated into the same space. The first and second antenna radiators are positioned to utilize overlapping or adjacent spatial regions, maximizing the use of available mounting space
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 secure antenna performance in limited spaces, reduces manufacturing costs, and allows for easy implementation, while maintaining effective RF communication capabilities across multiple frequency bands.
Implementation Method 1
a ground surface and a metal body, such as a metallic case frame, functioning as antenna radiators
Implementation Method 2
the ground surface of a sub-board and main board electrically connected to a metal case frame
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An antenna apparatus for a portable terminal which is light, thin, compact, and small. The antenna apparatus preferably includes a main board equipped with a power feeding part for feeding power and a ground surface for grounding the main board and at least one sub-board, each sub-board which has a ground surface and electrically communicates with the main board, wherein the ground surface of each sub-board receives power from the power feeding part of the main board and resonates.