Multi-Antenna Terminal Switching for Interference Isolation
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Solution Overview
Problem
Communication terminals with multiple antennas face interference issues due to electromagnetic coupling, which worsens with miniaturization, necessitating a method to prevent such interference.
Innovation Solution
A communication terminal with a system switch that connects to either a home antenna or a roaming antenna based on priority settings, allowing for isolation of antennas and preventing interference by determining the home or roaming system to access based on power state and service requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are used to support multiple frequency bands and communication systems, then the communication terminal can access multiple communication systems and provide high-speed data transmission, but electromagnetic coupling between antennas causes interference that worsens with miniaturization
Solution Approach 1:
The patent divides the antenna system into separate home antenna and roaming antenna units, each dedicated to specific frequency bands. The system switch segments the signal paths, allowing independent operation of each antenna to minimize electromagnetic coupling interference while maintaining multi-frequency band capability.
Solution Approach 2:
The system switch acts as an intermediary between the antennas and the communication systems. It selectively connects the appropriate antenna (home or roaming) based on the target communication system, preventing simultaneous operation that would cause interference while enabling access to multiple systems.
2Volume of moving object
If antennas are placed closer together to achieve miniaturization, then the communication terminal size is reduced, but interference between antennas is exacerbated
Solution Approach 1:
By segmenting the antenna functions into dedicated home and roaming antennas with specific frequency band assignments, the patent enables closer antenna placement without significant interference. The system switch ensures only one antenna operates at a time, mitigating the interference that would normally result from miniaturization.
Solution Approach 2:
Each antenna is designed with specific local characteristics optimized for its designated frequency band. The home antenna is optimized for home system frequencies while the roaming antenna is optimized for roaming system frequencies, allowing compact arrangement with reduced mutual interference through frequency-specific design.
3Adaptability or versatility
If multiple antennas operate simultaneously, then the terminal can access multiple frequency bands, but the antennas must be operated as one body which causes interference
Solution Approach 1:
The system switch dynamically connects or disconnects antennas based on operational requirements. Instead of operating antennas simultaneously as a static system, the patent implements dynamic switching between home and roaming antennas, enabling multi-frequency band access while preventing interference through sequential operation.
Solution Approach 2:
The system determines in advance whether home system or roaming system access is needed and pre-configures the system switch to connect the appropriate antenna. This preliminary determination prevents interference by ensuring only the required antenna is activated before communication begins.
Data Source
AI summary
Provided is a method of accessing to a communication system in a terminal comprising a plurality of antennas, which includes determining a home system which is previously set to preferentially access from a preferred roaming list of a plurality of communications systems, when power is turned on; connecting a system switch to a home antenna for communicating with the home system in a specific frequency band; and accessing the home system to use the home service through the home antenna.