Antenna Radiation Switching for Spurious Emission Control
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Solution Overview
Problem
Radiated spurious emission, particularly in GSM bands, exceeds standards due to strong energy excitation and harmonics, especially with the presence of non-linear devices near antennas in electronic devices, leading to communication quality issues.
Innovation Solution
An antenna assembly with an adjusting unit and an antenna switch controlled by a controller to dynamically adjust the radiation direction based on the current working power of the antenna, ensuring optimal communication quality and preventing excessive spurious emission by selecting between two radiation directions, one optimal and another deviating from functional devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna radiates in the optimal radiation direction to ensure communication quality, then the communication quality is improved, but the radiated spurious emission exceeds standards
Solution Approach 1:
The patent implements dynamic adjustment of the antenna radiation direction based on real-time detection of working power. The controller switches between a first radiation direction (optimal for communication) and a second radiation direction (deviating from functional devices) according to whether the working power exceeds a threshold, making the radiation direction adaptable rather than fixed
Solution Approach 2:
The patent changes the radiation direction parameter of the antenna based on the working power level. When working power is high, the radiation direction is adjusted to deviate from functional devices to reduce spurious emission; when working power is low, the optimal radiation direction is used to ensure communication quality
2Adaptability or versatility
If non-linear devices are placed near the antenna to save space, then the device integration is improved, but the radiated spurious emission increases
Solution Approach 1:
The controller acts as an intermediary between the antenna and the functional devices. It detects the working power and dynamically adjusts the radiation direction to avoid direct radiation toward functional devices when power is high, thereby mediating the interaction between the antenna and nearby components to reduce spurious emission
Solution Approach 2:
The radiation direction is made dynamic and adaptable to the operating conditions. The system can switch between different radiation directions based on working power levels, allowing the antenna to coexist with nearby functional devices without causing excessive spurious emission
Data Source
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AI summary
Terminal device (100), comprising an antenna assembly (1), a controller (2), and a functional apparatus (3). The antenna assembly (1) comprises an antenna (11), an adjusting unit (12), and an antenna switch (13); the adjusting unit (12) comprises a first adjusting unit (121) and a second adjusting unit (122); the controller (2) is used for controlling, according to the current working power of the antenna (11), the antenna switch (13) to select one of the first adjusting unit (121) and the second adjusting unit (122) to be in an enabled state, so that the radiation direction of the antenna (11) can be adjusted to the corresponding radiation direction. The terminal device (100) changes the radiation direction of the antenna (11) according to different working powers of the antenna (11), and can prevent radiated spurious emission from exceeding a standard while ensuring the communication quality.