Conductive Shell Antenna Isolation via Slotted Conductor
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Solution Overview
Problem
In notebook computers, the increasing trend towards lightweight and compact designs has led to MIMO antennas being placed closer together, resulting in mutual interference due to shared resonate frequencies, which complicates achieving high isolation between them.
Innovation Solution
An electronic device design featuring a conductive shell with an insulating layer and an isolating conductor having a slot between the ground planes of two antennas, where the slot's length is optimized to match the antennas' resonate frequency, allowing for effective signal isolation through the creation of a coupling electric field and equivalent capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If MIMO antennas are placed closer together to achieve compact and lightweight design, then device size and weight are reduced, but mutual interference between antennas increases due to shared resonate frequencies
Solution Approach 1:
An isolating conductor with a slot is introduced as an intermediary component between the two antennas. This isolating conductor acts as a mediator that blocks the harmful electromagnetic coupling between antennas while allowing the antennas to remain in close proximity for compact device design. The slot in the isolating conductor specifically targets and eliminates the mutual interference caused by shared resonate frequencies.
Solution Approach 2:
The ground plane is segmented into separate regions for each antenna by introducing the isolating conductor with a slot. This segmentation divides the originally shared ground plane into distinct zones, preventing the harmful interaction between antennas that would otherwise occur through the continuous ground plane, while maintaining the compact overall structure.
2Ease of manufacture
If a continuous ground plane is used for both antennas, then manufacturing is simplified, but signal isolation between antennas deteriorates
Solution Approach 1:
The isolating conductor with a slot serves as an intermediary element that is relatively easy to manufacture and integrate. Rather than requiring complex ground plane designs, this simple component with a slot effectively provides the necessary signal isolation while maintaining manufacturing simplicity. The isolating conductor can be easily positioned and connected to the ground plane without requiring complex fabrication processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively isolates signals between the antennas, preventing mutual interference and meeting the requirement for high isolation, while maintaining a compact and aesthetically pleasing form factor.
Implementation Method 1
the insulating layer is located between the shell and the isolating conductor so that the shell and the isolating conductor have a distance in between and are equivalent to a capacitor
Implementation Method 2
the creation of a coupling electric field
Implementation Method 3
The slot can be designed to have an appropriate length so as to coincide with the resonate frequency of the first antenna and the second antenna
Data Source
AI summary
An electronic device including a shell, an antenna unit, an insulating layer and an isolating conductor is provided. The material of the shell includes conductive material. The antenna unit is disposed on the shell and includes a first antenna and a second antenna. The first antenna and the second antenna are grounded to the shell. The insulating layer is disposed on the shell and located between a ground plane of the first antenna and a ground plane of the second antenna. The isolating conductor is disposed on the insulating layer and has a slot.