Antenna Isolation via Main Short Portion and Ground Segmentation
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Solution Overview
Problem
In thin and short communication devices, insufficient isolation between multiple antennas leads to significant interference, affecting signal transmission and reducing transmission rates, especially when antennas are placed close to the edge of a grounding plane.
Innovation Solution
The antenna device employs a specialized structure with distinct coupling, short, and feeding portions for each antenna, forming storage spaces with notches and gaps to enhance isolation, and a main short portion to reduce ground conduction current and interference, allowing antennas to be closer together while maintaining high resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If two antennas are designed in the same small space, then the device can be made thin and short, but interference between the two antennas becomes huge
Solution Approach 1:
The patent divides the ground plane into multiple isolated regions using isolation structures (such as ground isolation strips or slots) between adjacent antennas. This segmentation prevents current interference from propagating across the entire ground plane, effectively reducing mutual interference while maintaining compact antenna spacing
Solution Approach 2:
The patent introduces intermediary isolation structures (ground isolation strips, slots, or defected ground structures) between adjacent antennas. These intermediary elements act as barriers to current flow and electromagnetic coupling, reducing interference without requiring large separation distances
2Device complexity
If antennas are disposed in two sides of the ground, then the device layout is simplified, but current interference near the edge of the ground is generated
Solution Approach 1:
The patent extracts or removes ground plane material at the edges near antennas, creating isolation slots or defected ground structures. This extraction eliminates the continuous ground path that would otherwise support edge current interference, while maintaining the simplified dual-side antenna layout
Solution Approach 2:
The patent applies localized ground isolation structures specifically at critical regions (edge areas near antennas) rather than uniformly across the entire ground plane. This local modification targets edge current interference without affecting the overall layout simplicity or other functional areas
3Adaptability or versatility
If isolation between antennas is not sufficient, then antenna placement is flexible, but signal transmission is affected and transmission rate is reduced
Solution Approach 1:
The patent incorporates isolation structures during the initial antenna design and placement phase, proactively preventing interference before it can affect signal transmission. This preliminary isolation enables flexible antenna placement without compromising transmission performance
Data Source
AI summary
An antenna device includes a first antenna, a second antenna, a main short portion and a grounding portion. The first antenna and the second antenna are disposed in a PCB to radiate signals. The main short portion is disposed between the first antenna and the second antenna. The main short portion is further electrically coupled to the grounding portion. The main short portion adjusts current between the first antenna and the second antenna. Thus, the main short portion reduces interference between the first antenna and the second antenna. The first antenna includes a first feeding portion, a first short portion and a first coupling portion. A first end of the first feeding portion is suspended in the air. The first coupling portion is disposed in a first storage space. The first coupling portion is electrically insulated from the first short portion and the grounding portion.