Multi-Port Antenna Switching for High Isolation in Compact Radios
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Solution Overview
Problem
Existing antenna designs face challenges in isolating multiple antennas operating simultaneously, particularly in mobile radio equipment where physical separation is not feasible, due to frequency-dependent complex impedance and inductive/capacitive effects from nearby conductors and electric currents.
Innovation Solution
A multi-port antenna system with reconfigurable radiation patterns, utilizing multiple ports and switches to select different paths and phase offsets, allowing each port to operate with distinct radiation patterns, and an analogue signal interference cancellation circuit to manage interference, enabling simultaneous operation with high isolation between ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple antennas are placed close together in mobile radio equipment, then the equipment can be made compact and portable, but the antennas interfere with each other due to inductive and capacitive effects from nearby conductors and electric currents
Solution Approach 1:
The patent employs dynamic switching between different radiation patterns for each antenna port. By reconfiguring the radiation patterns in real-time based on operational conditions, the system adapts to minimize interference between closely-spaced antennas while maintaining compact form factor. The switch selects different path configurations that dynamically adjust the electromagnetic field distribution.
Solution Approach 2:
The invention changes the radiation pattern parameters of each antenna port independently. By selecting from multiple predefined radiation patterns with different beam directions and shapes, the system optimizes the spatial distribution of electromagnetic energy to reduce coupling effects between adjacent antennas, thereby mitigating interference without increasing physical separation.
2Adaptability or versatility
If antennas are designed to resonate with low Q-factor for broad operational bandwidth, then frequency isolation between antennas becomes difficult, but frequency division isolation is needed to operate multiple antennas simultaneously
Solution Approach 1:
The system dynamically switches radiation patterns based on the operational frequency and interference conditions. Each antenna port can independently select from multiple radiation patterns, allowing the system to maintain broad bandwidth operation while providing frequency-dependent spatial isolation when needed. This dynamic reconfiguration enables simultaneous operation of multiple antennas across wide frequency ranges.
Solution Approach 2:
The patent segments the radiation pattern control for each antenna port independently. By providing separate switching control for each port's radiation pattern, the system can optimize the spatial distribution of each antenna's energy independently, achieving frequency isolation through spatial separation of radiation beams rather than through frequency-selective filtering.
3Reliability
If extreme physical separation of antennas is implemented to reduce interference, then antenna isolation improves, but the equipment becomes too large for mobile applications
Solution Approach 1:
Instead of increasing physical separation in the spatial domain, the invention introduces control in the radiation pattern domain. By manipulating the directional characteristics and spatial distribution of electromagnetic energy through multiple selectable radiation patterns, the system achieves effective isolation without requiring increased physical distance between antenna elements.
Solution Approach 2:
The system provides dynamic control over radiation patterns for each antenna port, allowing real-time optimization of spatial energy distribution. This dynamic reconfiguration creates virtual isolation between antennas by directing their radiation patterns in different directions or shaping them to minimize overlap, achieving high isolation ratios in compact configurations.
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 allows for efficient simultaneous operation of multiple antennas with improved isolation and flexibility in radiation patterns, enhancing performance in crowded frequency environments and dynamic wireless conditions.
Implementation Method 1
a first multi-port antenna wherein the multi-port antenna operates with a first radiation pattern when a first port is used and operates with a second radiation pattern, different to the first radiation pattern, when a second port, different to the first port, is used
Implementation Method 2
the multiple paths between the node and each port of the pair of ports share a transmission line that comprises one or more feed points along a length of the transmission line and interconnects lengthwise the pair of ports
Data Source
AI summary
An apparatus is provided that includes a first multi-port antenna that operates with a first radiation pattern when a first port is used and operates with a second radiation pattern, different to the first radiation pattern, when a second port, different to the first port, is used. The apparatus also includes a second multi-port antenna that operates with a third radiation pattern when a third port is used and operates with a fourth radiation pattern, different to the third radiation pattern, when a fourth port, different to the third port, is used. The apparatus further includes at least one switch for selecting one of multiple paths between a node and each port of a pair of ports.