Antenna Structure Using Metallic Side Frame for Multi-Band Wireless
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Solution Overview
Problem
The existing antenna structures for wireless communication devices are complex and occupy significant space, hindering the miniaturization of these devices due to their large size and complexity, especially when handling different frequency bands like LTE-A.
Innovation Solution
The antenna structure incorporates a housing with a non-metallic backboard and a metallic side frame, featuring a coupling-feed design with a switching circuit that allows operation across multiple frequency bands (LTE-A low, middle, and high frequency bands) by adjusting impedance through switching elements, enabling efficient radiation signal generation without increasing device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional antenna structures are used to support multiple frequency bands, then frequency band coverage is improved, but device size and structural complexity increase
Solution Approach 1:
The antenna structure is designed to perform multiple functions by supporting low, middle, and high frequency bands through a single integrated structure. The side frame antenna element, combined with the switching circuit and matching circuit, enables the antenna to operate across multiple frequency bands without requiring separate antenna structures for each band, thus achieving multi-functionality while maintaining compact device size.
Solution Approach 2:
The antenna structure incorporates a switching circuit that dynamically adjusts the antenna's operating characteristics by switching between different configurations. This dynamic switching capability allows the antenna to adapt its impedance and resonant frequency to match different frequency bands, enabling flexible frequency band coverage without increasing physical size.
2Adaptability or versatility
If traditional antenna structures are used to support multiple frequency bands, then frequency band coverage is improved, but structural complexity increases
Solution Approach 1:
The antenna structure is segmented into distinct functional modules: the side frame antenna element, the switching circuit, and the matching circuit. This segmentation allows each module to be optimized independently while working together as an integrated system, reducing overall structural complexity compared to traditional multi-antenna designs.
Solution Approach 2:
The patent combines the antenna element, switching circuit, and matching circuit into a single integrated antenna structure. The side frame serves both as a structural component of the device housing and as the antenna element, merging multiple functions into one component to reduce overall structural complexity.
3Volume of moving object
If antenna size is reduced for device miniaturization, then device size is reduced, but radiating efficiency deteriorates
Solution Approach 1:
The matching circuit is designed to optimize the impedance parameters of the antenna across different frequency bands, ensuring efficient energy transfer and radiation. By adjusting the electrical parameters through the switching and matching circuits, the antenna maintains high radiating efficiency despite the compact physical size enabled by the side frame integration.
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 design allows for compact wireless communication devices that can effectively operate across multiple frequency bands with improved radiating efficiency, satisfying antenna design requirements while maintaining a non-metallic backboard for aesthetic and structural benefits.
Implementation Method 1
Antennas receive and transmit wireless signals at different frequencies
Implementation Method 2
a matching circuit 14. The side frame antenna element (A1) is electrically connected to the feeding portion (12) through the switching circuit (17) and the matching circuit (14)
Data Source
AI summary
An antenna structure utilizing as radiating elements only the metal frame of an electronic device includes a metal frame, a feeding portion, and a ground point. The metal frame defines a first gap and a second gap. The metal frame forms a radiating portion, a first coupling portion, and a second coupling portion through the first gap and the second gap. When the feed supplies current, the current flows through the radiating portion and, being coupled to the first coupling portion and second coupling portion through the first and second gaps, first, second, and third operating modes at different frequencies can be invoked to generate wireless signals in first, second, and third LTE-A frequency bands.