Planar Inverted-F Antenna Layout for Compact Device Integration
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Solution Overview
Problem
Existing inverted F-shaped antenna structures are too tall to be accommodated in the limited space of compact electronic devices, hindering their integration into lightweight and thin mobile devices.
Innovation Solution
The antenna structure is redesigned with a shortened impedance-matching terminal, an increased area of the radiation terminal, and a reduced distance between the ground terminal and the radiation terminal, allowing for a more compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the traditional inverted F-shaped antenna structure is used, then the radiation efficiency and impedance matching are maintained, but the height is too large (10 mm or more) to be accommodated in compact electronic devices
Solution Approach 1:
The patent transforms the traditional vertical inverted F-shaped antenna structure into a planar configuration by arranging the ground terminal, impedance-matching terminal, radiation terminal, and signal feed-in terminal in a two-dimensional layout on the same plane. This dimensional transformation reduces the height from 10 mm or more to a compact planar structure while preserving the electrical connection paths and radiation characteristics through optimized trace routing and terminal geometry.
2Length of moving object
If the antenna height is reduced to fit compact devices, then the space constraint is satisfied, but the impedance matching and radiation efficiency may deteriorate
Solution Approach 1:
The patent optimizes specific local characteristics of the antenna terminals to maintain impedance matching in the reduced-height planar configuration. The ground terminal includes a body with notches and lugs with perforations for precise positioning and grounding. The impedance-matching terminal features a bent configuration with specific geometry to control impedance transformation. The radiation terminal is square-shaped with optimized dimensions and includes a through-hole for feeding. These localized geometric optimizations ensure proper impedance matching without requiring the traditional vertical height.
3Length of moving object
If the impedance-matching terminal length is shortened, then the overall antenna height is reduced, but the impedance matching function may be compromised
Solution Approach 1:
The patent changes the geometric parameters of the impedance-matching terminal to achieve impedance transformation in a shortened planar configuration. The terminal is bent at specific angles and positioned at optimized distances from the ground terminal and radiation terminal. The width, length, and bend radius of the impedance-matching terminal are carefully controlled to provide the necessary impedance transformation ratio. These parameter optimizations enable effective impedance matching without requiring the traditional long vertical structure.
Data Source
AI summary
An inverted F-shaped single-band antenna structure includes a ground terminal, an impedance-matching terminal, a radiation terminal, and a signal feed-in terminal. The ground terminal includes a body. The impedance-matching terminal is bent and extended from the body, and is connected perpendicularly to the body. The radiation terminal is bent and extended from the impedance-matching terminal, and is connected perpendicularly to the impedance-matching terminal, and is arranged correspondingly with the body. The signal feed-in terminal is bent and extended from the radiation terminal, and connected perpendicularly to the radiation terminal, and arranged correspondingly with the impedance-matching terminal, and not connected to the body. A length of the impedance-matching terminal is shortened to increase an area of the radiation terminal and shorten a distance between the ground terminal and the radiation terminal, so the inverted F-shaped antenna structure is arranged inside electronic apparatuses with limited height and space.