Antenna Structure With Metal Frame Slots For Wide Bandwidth
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Solution Overview
Problem
Designing an antenna with a wide bandwidth in a limited space is a challenge due to the increasing bandwidth requirements in wireless communication technology, as devices become lighter and thinner.
Innovation Solution
The antenna structure incorporates a housing with a system ground plane, side frame, middle frame, and back board forming a metal frame, along with a switch circuit and specific gap and slot configurations to create multiple radiation portions, allowing for adjustable impedance matching and multi-frequency operations through a switch circuit that connects the radiation portions to the system ground plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the device becomes lighter and thinner, then the portability and form factor are improved, but the antenna substrate area is reduced
Solution Approach 1:
The patent transitions from a traditional planar antenna substrate to a three-dimensional metal frame structure. The antenna elements are formed along the edges and surfaces of the housing frame, utilizing vertical and lateral dimensions rather than relying solely on horizontal substrate area. This dimensional transformation allows the antenna to maintain adequate radiation area while accommodating thinner device profiles.
Solution Approach 2:
The antenna system is divided into multiple independent radiation portions (first radiation portion, second radiation portion, third radiation portion) distributed across different edges and surfaces of the metal frame. Each portion can be independently designed and optimized, allowing the total antenna area to be distributed across multiple locations rather than requiring a single large continuous substrate.
2Length of moving object
If the antenna substrate area is reduced, then the device can be made lighter and thinner, but the bandwidth of the antenna is limited
Solution Approach 1:
The metal frame structure serves multiple functions simultaneously: it provides mechanical support for the device, forms the antenna radiation elements, and creates resonant cavities. The same structural components that define the device's thin profile also serve as the antenna elements, eliminating the need for separate antenna substrates and enabling wide bandwidth operation within the constrained thickness.
Solution Approach 2:
The patent employs switch circuits to dynamically reconfigure the antenna system's electrical characteristics. By switching between different connection configurations (grounding different radiation portions at different times), the antenna can adapt its impedance and resonant frequencies to support multiple frequency bands and wide bandwidth operations without requiring physical changes to the structure.
3Adaptability or versatility
If multiple frequency bands are supported, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The metal frame and its edge elements serve as universal antenna elements that can operate across multiple frequency bands. The same physical structure supports LTE, GSM, WCDMA, and Wi-Fi frequencies simultaneously through its distributed radiation portions and resonant characteristics, eliminating the need for separate antenna systems for each frequency band.
Solution Approach 2:
Switch circuits are integrated into the antenna system to dynamically reconfigure electrical connections between radiation portions and ground planes. By switching the grounding configuration and impedance matching networks, the antenna system can adapt to different frequency bands and operational modes without requiring multiple fixed antenna structures, thereby managing complexity through active control rather than passive multiplication of 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 achieves a wide bandwidth and optimal efficiency, covering various frequency bands including LTE-A, GSM, WCDMA, and Wi-Fi frequencies, while maintaining a thin form factor and high screen-to-body ratio, supporting carrier aggregation and improved radiation performance.
Implementation Method 1
a first radiation portion F1, a second radiation portion F2, and a third radiation portion F3 are formed from the side frame 111
Data Source
AI summary
An antenna structure with wide bandwidth in a reduced physical space includes a housing, a side wall, and a first feed portion. The housing includes a metal side frame, a metal middle frame, and a metal back board. The side wall is made of metal material. The metal middle frame and the metal back board are coupled to two sides of the side wall, and the metal middle frame is parallel to the metal back board. The metal side frame surrounds the metal back board. The metal side frame defines at least one gap. The metal back board defines a slot. The slot and the at least one gap cooperatively divide at least two radiation portions from the metal side frame. A wireless communication device employing the antenna structure is also provided.