Conductive Antenna Casing Layout for MIMO Interference Isolation
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Solution Overview
Problem
Wireless communication systems using multiple antennas, such as MIMO, face interference issues when applied to compact devices like tablet-shaped X-ray imaging apparatuses, where bending parasitic antennas and metal blocks to maintain electrical length leads to deviated wave reflection and reduced communication performance.
Innovation Solution
A wireless communication apparatus with a casing formed of conductive materials, featuring a partition portion and strategically designed openings and passages to manage radio wave interference, including a configuration with a support plate and partition plate to reduce RF interference between antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple antennas are used in a MIMO system to increase communication speed, then communication speed is improved, but radio wave interference between antennas deteriorates communication performance
Solution Approach 1:
The casing is divided into multiple regions using partition portions, with each partition separating different antennas and their corresponding openings. This segmentation prevents radio waves from one antenna from interfering with another antenna, allowing multiple antennas to operate simultaneously without mutual interference, thus maintaining both high communication speed and performance.
Solution Approach 2:
Different regions of the casing are assigned different functions: some regions contain antennas for transmission, others contain openings for signal reception, and partition portions are strategically placed to manage electromagnetic field distribution. This local differentiation optimizes the electromagnetic environment for each antenna while preventing interference.
2Manufacturing precision
If parasitic antennas and metal blocks are bent to maintain electrical length in thin plate-shaped apparatuses, then electrical length is maintained, but radio wave reflection is deviated causing partial interference
Solution Approach 1:
Instead of bending the parasitic antennas and metal blocks within the limited thickness dimension, the patent extends the solution into the surface area dimension by strategically placing multiple openings and partition portions on the casing surface. This allows maintaining proper electrical length without deviation while preventing radio wave interference through spatial separation.
Solution Approach 2:
Partition portions act as intermediary structures between different antenna systems and openings. These conductive partitions manage the electromagnetic fields, preventing direct interference between antennas while allowing each antenna system to maintain its proper electrical characteristics without bending.
3Object-affected harmful factors
If all surfaces of the casing are made conductive for shielding, then electromagnetic shielding is improved, but radio frequency interference between antennas increases
Solution Approach 1:
The conductive casing is segmented into multiple isolated regions using conductive partition portions. Each partition creates an electromagnetic boundary that prevents radio frequency interference between antennas while maintaining the overall shielding effectiveness of the conductive casing against external electromagnetic interference.
Solution Approach 2:
Different regions of the conductive casing serve different purposes: outer surfaces provide electromagnetic shielding, while internal partition portions manage inter-antenna interference. This local functional differentiation allows the casing to simultaneously provide shielding protection and prevent internal radio frequency interference.
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
The solution effectively reduces radio frequency interference between antennas, maintaining communication performance even when all surfaces of the casing are conductive, and allows for efficient assembly and operation in compact devices.
Implementation Method 1
the parasitic antenna to operate as a reflector by switching electrical lengths of the parasitic antenna elements using a switching circuit, in addition to a metal block serving as a reflector
Data Source
AI summary
A wireless communication apparatus includes a first antenna, a second antenna, a control unit configured to output a signal to the first antenna and the second antenna, a first wiring configured to connect the control unit and the first antenna, a second wiring configured to connect the control unit and the second antenna, a casing formed of a conductor, the casing being configured to accommodate the first antenna, the second antenna, the control unit, the first wiring, and the second wiring, and including a first opening disposed in opposition to the first antenna and a second opening disposed in opposition to the second antenna, and a partition portion formed of a conductor and configured to partition the first antenna and the first opening from the second antenna and the second opening.