Mobile Terminal Antenna Assembly With Shared Ground Isolation
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Solution Overview
Problem
The design trend towards simpler and thinner mobile terminal devices has resulted in limited space for antennas, leading to poor isolation between them and compromised performance due to a worsening operating environment.
Innovation Solution
An antenna assembly featuring a coupled loop antenna and a loop antenna with specific positional relationships and grounding configurations, including a gap between radiators and shared ground wires, to ensure orthogonally complementary currents and prevent crosstalk, along with frequency selective networks and matching networks to filter and isolate different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are configured to cover multiple operating frequency bands, then wireless communication capabilities are improved, but isolation between antennas deteriorates due to limited space
Solution Approach 1:
The patent divides the ground wire into multiple segments (first ground wire and second ground wire) connected to different radiators. Each ground wire segment is independently configured to provide dedicated grounding paths for different antennas, thereby maintaining ground isolation even when antennas are placed in close proximity. This segmentation allows multiple antennas to operate simultaneously with improved isolation performance.
Solution Approach 2:
The patent applies different grounding configurations to different parts of the antenna system. Specifically, the first ground wire connects to the first radiator while the second ground wire connects to the second radiator, creating localized grounding zones. This local quality differentiation ensures that each antenna has its own optimized grounding path, improving overall antenna isolation while maintaining compact design.
2Length of moving object
If antennas are placed closer together to reduce device size, then device thickness is reduced, but antenna performance deteriorates due to increased crosstalk
Solution Approach 1:
The patent introduces ground wires as intermediary elements between the radiators and the ground plane. These ground wires act as mediators that control the electromagnetic field distribution and current flow paths. By carefully designing the ground wire connections, the patent enables compact antenna placement while maintaining performance through controlled field isolation.
Solution Approach 2:
The patent addresses the two-dimensional space constraint by utilizing the third dimension (vertical grounding paths through ground wires). Instead of only increasing horizontal separation between antennas, the invention uses vertical grounding connections to achieve isolation, effectively transforming the problem from a 2D layout issue to a 3D electromagnetic structure optimization.
Data Source
AI summary
This application provides an antenna assembly. The antenna assembly includes at least a first antenna and a second antenna. The first antenna includes a first feed point and a first radiator connected thereto. The second antenna includes a second feed point and a second radiator connected thereto. There is a gap between the first radiator and the second radiator. An end of the second radiator close to the gap is provided with a first ground wire shared by the first antenna and the second antenna. An end of the second radiator away from the gap is provided with a second ground wire. Because currents excited by the first antenna and the second antenna are orthogonally complementary, crosstalk does not occur between the ground currents of the first antenna and the second antenna.