Switch Circuit Antenna Structure for Multi-Band LTE
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Solution Overview
Problem
The reduced dimensions of wireless communication devices restrict the bandwidth of antenna structures, making it difficult to simultaneously satisfy transmission requirements for different wireless communication standards like the Long Term Evolution standard in America and Europe, particularly in the low-frequency band.
Innovation Solution
An antenna structure comprising a first radiator, a second radiator, a second coupling portion, and a switch circuit that changes the coupling degree between these components to shift the operation band, allowing the antenna to adapt to different frequency requirements without increasing the total length, using a switch circuit to form or remove an electric path between the second radiator and the second coupling portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the total length of the antenna structure is extended to increase low-frequency bandwidth, then the bandwidth is improved, but the device dimensions increase
Solution Approach 1:
The patent employs a switch circuit to dynamically reconfigure the antenna structure between two operational modes. In the first mode, the switch circuit forms an electric path connecting the second radiator to the second coupling portion, enabling operation in a first frequency band. In the second mode, the switch circuit removes this electric path, allowing operation in a second frequency band. This dynamic reconfiguration allows the antenna to adapt its electrical characteristics without physically extending its total length, thereby resolving the contradiction between bandwidth and device dimensions.
Solution Approach 2:
The patent changes the electrical parameters of the antenna structure by selectively connecting or disconnecting the second radiator from the second coupling portion. This parameter change alters the resonant frequency and impedance characteristics of the antenna, enabling it to operate in different frequency bands (e.g., American LTE band 1710-2170 MHz and European LTE band 791-960 MHz) without changing its physical dimensions.
2Length of moving object
If the antenna structure is reduced in dimension to meet device size requirements, then device compactness is improved, but the operation band range is restricted
Solution Approach 1:
The switch circuit enables the compact antenna structure to dynamically adapt its electrical length and resonant characteristics. By reconfiguring the electric paths between radiators and coupling portions, the antenna can support multiple operation bands (American and European LTE bands) despite its reduced physical dimensions, thus resolving the contradiction between compactness and adaptability.
Solution Approach 2:
The antenna structure is designed to perform multiple functions by supporting different operation bands through a single compact physical structure. The switch circuit enables the antenna to serve both American LTE (1710-2170 MHz) and European LTE (791-960 MHz) requirements, making the antenna universal across different regional standards without requiring multiple separate antenna elements.
3Adaptability or versatility
If the coupling degree between radiators and coupling portions is changed to shift operation band, then frequency adaptability is improved, but the device complexity increases
Solution Approach 1:
The antenna structure is segmented into distinct functional components: first radiator, second radiator, first coupling portion, second coupling portion, and switch circuit. This segmentation allows independent control and optimization of each component's contribution to different frequency bands, enabling frequency adaptability through controlled coupling changes while keeping the overall structure manageable and not excessively complex.
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
The antenna structure effectively shifts its operation band to meet transmission requirements for different regions, such as America and Europe, while maintaining a shorter total length, ensuring improved transmission performance.
Implementation Method 1
The antenna structure includes a first radiator, a second radiator, a second coupling portion and a switch circuit... when the antenna structure is in a first mode, the switch circuit forms an electric path between the second radiator and the second coupling portion, and when the antenna structure is in a second mode, the switch circuit removes the electric path between the second radiator and the second coupling portion
Data Source
AI summary
An antenna structure is provided, including a first radiator, a second radiator, a second coupling portion and a switch Circuit. The first radiator includes a feed portion and a first radiator body. The second radiator includes a first coupling portion, a second radiator body and a ground portion. The first coupling portion is connected to a first end portion of the second radiator body. The ground portion is connected to the second radiator body. At least a portion of the first radiator body is located between the first coupling portion and the second coupling portion. When the antenna structure is in a first mode, the switch circuit forms an electric path between the second radiator and the second coupling portion, and when the antenna structure is in a second mode, the switch circuit removes the electric path between the second radiator and the second coupling portion.