Mobile Device Antenna Structure Using Nested Ground Branches
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mobile devices face challenges in efficiently accommodating multiple antennas for various frequency bands due to limited internal space, leading to reduced antenna efficiency and bandwidth, as each antenna is close to electronic components.
Innovation Solution
A mobile device design incorporating a ground plane, ground branch, supporting element, and circuit element, where a slot is formed between the ground branch and plane, with a first antenna structure excited by a first signal source and a second antenna structure on the supporting element excited by a second signal source, allowing for efficient operation across low, medium, and high-frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are arranged in the mobile phone to operate in different bands, then the wireless communication coverage is improved, but the antenna efficiency and bandwidths are reduced due to proximity to electronic components
Solution Approach 1:
The patent introduces a third dimension (vertical height) by positioning antennas at different heights above the ground plane. The first antenna is at a first height and the second antenna is at a second height, creating spatial separation that improves isolation and efficiency while maintaining compact horizontal footprint.
Solution Approach 2:
The patent embeds multiple antenna structures within a compact mobile device housing, with antennas nested at different vertical levels. The ground plane serves as a common reference for both antennas, creating a nested configuration that maximizes space utilization.
2Adaptability or versatility
If more antennas are added to the mobile phone, then the frequency band coverage is improved, but the device complexity increases
Solution Approach 1:
The ground plane serves multiple functions: it acts as the ground reference for both the first and second antennas, provides shielding, and enables both antenna structures to share a common reference plane. This multi-functionality reduces overall device complexity despite supporting multiple frequency bands.
Solution Approach 2:
The antenna system is segmented into distinct first and second antenna structures operating at different heights, with each antenna optimized for specific frequency bands. This segmentation allows independent optimization of each antenna while sharing common resources like the ground plane.
3Volume of moving object
If antennas are placed closer to electronic components to save space, then the device size is reduced, but the antenna bandwidth is reduced
Solution Approach 1:
By utilizing the vertical dimension with antennas at different heights above the ground plane, the patent achieves spatial separation that improves antenna bandwidth and performance without increasing the horizontal device footprint, thus maintaining compact size while improving electrical performance.
Data Source
AI summary
A mobile device includes a metal housing and an antenna structure. A ground plane and a ground branch form at least a portion of the metal housing. The ground branch is coupled to the ground plane. A slot is formed between the ground branch and the ground plane. A circuit element is coupled to the ground branch and the ground plane. The antenna structure is formed by the ground branch. The antenna structure is excited by a signal source.