Multiband Antenna Branch Layout to Prevent Near-Band Interference
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Solution Overview
Problem
In electronic devices with limited internal space, such as those using 4G and 5G communication bands, traditional antenna designs face challenges due to close proximity of antennas operating at nearby frequencies, leading to mutual interference and poor communication effects.
Innovation Solution
The implementation of a spatial multiplexing antenna module with a common feed structure and divided antenna branches, where one group is placed on the inner non-metallic surface and the other on the outer surface, folded to avoid coplanarity, allowing for three-dimensional arrangement and multiband coverage without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antennas are placed close together to reduce device size, then the device achieves a compact form factor and high screen-to-body ratio, but the antennas experience mutual interference when operating at nearby frequencies
Solution Approach 1:
The patent transitions from traditional planar antenna arrangements to a three-dimensional configuration by folding antenna branches along the device thickness direction. The first antenna group is arranged on the front surface while the second antenna group is arranged on the back surface, utilizing the Z-axis dimension to separate antenna paths and reduce mutual interference while maintaining compact footprint.
Solution Approach 2:
The patent divides the antenna system into two separate groups: a first antenna group for first communication bands and a second antenna group for second communication bands. This segmentation allows each group to be independently optimized and positioned in different spatial zones, preventing frequency interference between bands while maintaining overall compactness.
2Adaptability or versatility
If multiple antennas are arranged in limited space for multiband support, then the device achieves broad frequency coverage, but tuning becomes difficult due to mutual interference between nearby frequency antennas
Solution Approach 1:
By arranging antenna groups on opposite surfaces of the device housing and utilizing folded configurations along the thickness direction, the patent creates sufficient spatial separation between antennas operating at nearby frequencies. This three-dimensional arrangement reduces coupling effects and makes impedance tuning more predictable and manageable.
Solution Approach 2:
The patent introduces a feeding structure that acts as an intermediary between the antenna groups and the communication modules. This feeding structure is specifically designed to minimize interference between adjacent frequency antennas while maintaining efficient signal transmission, facilitating easier tuning and optimization of each antenna group independently.
Data Source
AI summary
An electronic device. An antenna module of this electronic device includes a plurality of antenna branches; a common feed structure is disposed between the plurality of antenna branches; the plurality of antenna branches are divided into a first group of antenna branches and a second group of antenna branches; the first group of antenna branches and the second group of antenna branches respectively correspond to different communication bands; and the common feed structure and the first group of antenna branches are disposed on an inner surface of a housing of the electronic device, and the second group of antenna branches are disposed on an outer surface of the housing of the electronic device.