Multi-band isolator assembly for antenna isolation
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Solution Overview
Problem
Antennas in computing devices face challenges in isolating signals across different frequency bands, leading to reduced system performance due to signal coupling, especially in smaller devices with limited space for proper antenna spacing.
Innovation Solution
An isolator assembly with parasitic structures that resonate in multiple non-overlapping frequency bands, using a selection network to selectively allow or block current passage based on frequency, preventing surface current coupling between antennas operating in different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas operating at various frequencies are included in a single computing device, then the device can support multiple frequency bands, but antenna signals can couple together and reduce system performance
Solution Approach 1:
The patent introduces an isolator assembly as an intermediary component positioned between multiple antennas. This isolator includes parasitic structures that resonate at specific frequencies to block electromagnetic coupling between antennas operating in different frequency bands, thereby maintaining system performance while supporting multi-frequency operations
Solution Approach 2:
The isolator assembly is strategically positioned in specific locations between antennas where coupling occurs. The parasitic structures within the isolator are designed with specific geometries and materials to provide frequency-selective isolation, creating local electromagnetic properties that differ from the surrounding space to prevent signal interference
2Reliability
If antennas are properly spaced from one another to prevent signal coupling, then system performance is maintained, but small computer electronics offer fewer antenna spacing possibilities, limiting design options
Solution Approach 1:
The isolator assembly serves as a mediator that enables compact antenna spacing by actively managing electromagnetic interactions between closely spaced antennas. This allows designers to maintain small form factors while preserving system performance through the isolator's frequency-selective coupling prevention
Solution Approach 2:
Instead of relying solely on spatial separation in the horizontal plane, the patent introduces isolation in the electromagnetic dimension by using resonant parasitic structures. This transforms the problem from a spatial constraint to an electromagnetic field management solution, enabling compact designs
3Volume of moving object
If antennas are placed close together in small devices, then device size is reduced, but antenna signals couple together and reduce system performance
Solution Approach 1:
The isolator assembly is positioned between closely spaced antennas to prevent electromagnetic coupling. The parasitic structures within the isolator resonate at frequencies that block signal interference, enabling compact device design while maintaining antenna isolation and system performance
Solution Approach 2:
The isolator's parasitic structures are designed with specific dimensions, shapes, and material properties that change the electromagnetic parameters of the space between antennas. By tuning the resonant frequencies of these parasitic elements, the isolator dynamically alters the electromagnetic environment to prevent coupling at specific frequency bands
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 isolator assembly effectively isolates antennas operating in different frequency bands, improving signal strength and system performance by reducing interference, with maximum isolation improvements observed in specific frequency ranges.
Implementation Method 1
parasitic structures that resonate to provide isolation in multiple non-overlapping frequency bands
Data Source
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AI summary
An isolator assembly is configured to provide isolation in each of multiple non-overlapping frequency bands and includes a selection network to select one of the multiple non-overlapping frequency bands for an isolation operation. During the isolation operation, the isolator assembly prevents signal coupling between antennas that are positioned on opposite sides of the isolator assembly.