Resilient Resonator Filter Housing for Compact Low-Band MIMO
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Solution Overview
Problem
Existing filter arrangements for mobile communication antennas are too large and lack reproducible electrical parameters, making it difficult to achieve compact designs that support MIMO operation in the low band, which requires multiple signal paths for transmitting and receiving channels.
Innovation Solution
A compact filter arrangement with variable and resilient resonator inner conductors made of metal or dielectric materials, featuring a circumferential wall with folds or bellows that compensate for mechanical and thermal tolerances, allowing for reproducible electrical parameters and efficient signal path establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional coaxial metal cavity resonators or dielectric resonators are used in filter arrangements, then the electrical losses are reduced and sufficient unloaded Q is maintained, but the filter volume becomes too large and the electrical parameters are hard to reproduce
Solution Approach 1:
The patent changes the physical parameters of the resonator by using a spring element that can vary its length and stiffness. The spring constant and natural frequency are adjusted by changing the number of folds or bellows in the spring structure, allowing tuning of the resonant frequency and Q-factor while maintaining a compact size. This enables achieving high unloaded Q without requiring large traditional cavity structures.
Solution Approach 2:
The patent introduces a dynamic element (spring) that can adapt its mechanical properties. The spring element's resilience allows it to compensate for manufacturing tolerances and thermal expansions, maintaining stable electrical parameters. The dynamic nature of the spring enables reproducible electrical characteristics by self-adjusting to optimal positions, solving the reproducibility issue of traditional static filter structures.
2Ease of manufacture
If traditional rigid filter structures are used, then the structure is simple to manufacture, but the electrical parameters are hard to reproduce and mechanical tolerances cannot be compensated
Solution Approach 1:
The patent incorporates a spring element that beforehand cushions against manufacturing tolerances and thermal expansions. The spring's elastic properties allow it to absorb dimensional variations and maintain consistent electrical contact pressure, ensuring reproducible electrical parameters despite variations in manufacturing processes. This pre-built compensation mechanism eliminates the need for extremely tight manufacturing tolerances.
3Adaptability or versatility
If multiple resonators are used to achieve MIMO operation in the low band, then the bandwidth to mobile devices is increased, but the filter arrangement becomes too large and complex
Solution Approach 1:
The patent employs multiple spring resonators that can be nested or closely integrated within a compact filter housing. The spring elements can be arranged in parallel or series configurations, allowing multiple resonant frequencies to be achieved in a small volume. This nested arrangement enables MIMO operation with multiple transmitting and receiving channels without requiring a large filter structure.
Solution Approach 2:
The spring resonator design serves multiple functions: it provides mechanical resilience, electrical resonance, and tolerance compensation simultaneously. The same spring element that provides mechanical flexibility also determines the electrical resonant frequency and Q-factor. This multi-functionality reduces the overall device complexity compared to separate mechanical and electrical components.
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
Enables the creation of a compact filter arrangement that supports MIMO operation in the low band by providing multiple signal paths, ensuring reliable and reproducible electrical parameters across various frequencies, from 600 MHz to 960 MHz.
Implementation Method 1
The respective m first resonator inner conductor is variable in length and resilient along its longitudinal axis so that the second end can be moved to works and away from the first end
Implementation Method 2
Between the second end of the respective m first resonator inner conductor and the cover arrangement at least one insulator assembly is arranged
Data Source
AI summary
A filter arrangement (1) comprises a filter housing (2) with a housing base (3) and housing walls (4). A cover arrangement (6) closes the filter housing (2). Resonator inner conductors (8) extend from the housing base (3) to the cover arrangement (6) and end at a distance therefrom. Each of the first resonator inner conductors (8) comprises a first and a second end (8a, 8b). The first end (8a) is galvanically connected to the housing base (3). At least one insulator assembly (15) is arranged between the second end (8b) of the respective first resonator inner conductor (8) and the cover arrangement (3). The respective first resonator inner conductor (8) is variable in length and resilient along its longitudinal axis so that the second end (8b) can be moved towards and away from the first end (8a), thereby keeping the insulator assembly (15) pressed against the cover arrangement (6).