Mobile Device Antenna Structure with Tunable Impedance
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Solution Overview
Problem
Mobile devices face challenges in efficiently accommodating multiple antennas due to limited internal space, leading to reduced antenna efficiency and bandwidth, as each antenna is close to electronic components, affecting performance.
Innovation Solution
A mobile device with a multi-band antenna structure that includes a radiation element, a tunable circuit element, and a tuner, where the antenna structure and tunable circuit element are disposed in a clearance region, and the tuner and signal source are in a circuit board region, allowing for variable impedance adjustment to optimize antenna performance across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If more antennas are arranged in the mobile phone to cover different frequency bands, then the wireless communication coverage is improved, but the antenna efficiency and bandwidth are reduced due to limited space and proximity to electronic components
Solution Approach 1:
The patent employs a tuner with variable impedance value that can be dynamically adjusted to optimize antenna performance. The tunable circuit element allows the antenna system to adapt its electrical characteristics in real-time, compensating for the proximity effects of electronic components and maintaining high efficiency across different frequency bands despite the compact arrangement
Solution Approach 2:
The patent changes the impedance parameter of the antenna system by introducing a tuner with variable impedance value. This parameter adjustment allows the antenna to maintain optimal performance across multiple frequency bands while coexisting with electronic components in the limited mobile phone space, effectively resolving the contradiction between coverage and efficiency
2Volume of moving object
If the antenna structure is placed close to electronic components to save space, then the device compactness is improved, but the antenna performance is degraded
Solution Approach 1:
The patent introduces a tuner as an intermediary component between the antenna structure and the signal source. This tuner with variable impedance acts as a mediator that compensates for the detrimental effects of placing the antenna close to electronic components, allowing the antenna to maintain high performance while enabling compact device design
3Adaptability or versatility
If multiple antennas are arranged in limited space, then the frequency band coverage is expanded, but the antenna bandwidth is reduced
Solution Approach 1:
The patent creates a multi-functional antenna system where a single antenna structure, equipped with a tunable circuit element and tuner, can operate across multiple frequency bands. The variable impedance tuner allows the same antenna to be optimized for different bands (2G, 3G, LTE, Wi-Fi, Bluetooth), eliminating the need for multiple separate antennas and their associated bandwidth limitations
Solution Approach 2:
The tunable circuit element with variable impedance value enables the antenna to dynamically adjust its electrical characteristics to maintain optimal bandwidth performance across different frequency bands, resolving the contradiction between expanded coverage and maintained bandwidth
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 solution enables the mobile device to operate in multiple frequency bands with improved antenna efficiency and bandwidth, maintaining performance even when a user is close to the antenna, while also allowing for integration of electronic components to save space.
Implementation Method 1
a tuner, having a variable impedance value, and coupled between the tunable circuit element and the signal source
Data Source
AI summary
A mobile device includes an antenna structure, a signal source, a tunable circuit element, and a tuner. The antenna structure includes a radiation element. The tunable circuit element is coupled to the radiation element. The antenna structure and the tunable circuit element are disposed in a clearance region of the mobile device. The tuner has a variable impedance value, and is coupled between the tunable circuit element and the signal source. The tuner and the signal source are disposed in a circuit board region of the mobile device.