Multi-Layer Bandpass Filter with Partial Overlap Coupling
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Solution Overview
Problem
Current bandpass filters for 5G communication applications face challenges in achieving high performance, compact size, and effective shielding, particularly in millimeter-wave frequencies, where the number of antennas and filters increases proportionally, leading to size and electromagnetic radiation issues.
Innovation Solution
A multi-layer bandpass filter design featuring resonator conductors on separate layers with a partial overlap and specific length ranges (λg/3 to λg/5) to optimize coupling and shielding, along with a conductive structure of metal vias for improved energy coupling and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased to extend coverage and increase frequency spectrum efficiency, then the data rate and coverage are improved, but the number of filters required increases proportionally, leading to increased device size
Solution Approach 1:
The patent combines multiple filter functions into a single integrated multi-layer structure. Multiple resonator conductors on different layers share common input and output conductors, allowing multiple filtering functions to be merged into one compact device, thereby reducing the overall device size while maintaining high data rate capability
Solution Approach 2:
The patent transitions from planar two-dimensional filter arrangements to three-dimensional multi-layer structures. By stacking resonator conductors on multiple layers with vertical spacing, the filter achieves compact footprint while maintaining performance, effectively utilizing the third dimension to reduce device area
2Device complexity
If traditional filter designs are used, then the structure is simple, but the shielding effect is insufficient and electromagnetic radiation leaks to the surroundings
Solution Approach 1:
The patent implements nested shielding structures where ground conductors are positioned between resonator conductors on adjacent layers, creating nested electromagnetic shielding. This nested arrangement confines electromagnetic fields within the filter structure, preventing radiation leakage while maintaining relatively simple fabrication processes
Solution Approach 2:
The patent introduces ground conductors as intermediary elements between resonator conductors on different layers. These ground conductors act as electromagnetic shields, blocking field coupling between adjacent resonators and preventing harmful radiation leakage without significantly complicating the overall structure
3Ease of manufacture
If resonator conductors are placed on the same layer, then the manufacturing is simple, but the coupling efficiency and performance are limited
Solution Approach 1:
The patent moves resonator conductors from the same two-dimensional layer to different three-dimensional layers with vertical spacing. This spatial separation in the third dimension enables independent optimization of each resonator while maintaining strong coupling through controlled electromagnetic fields, thereby improving performance without significantly complicating manufacturing
Solution Approach 2:
The patent segments the filter structure into multiple layers with resonator conductors on separate layers. This segmentation allows independent design and optimization of each resonator while maintaining overall filter performance, and the modular layered structure facilitates standardized manufacturing processes
4Area of stationary object
If compact filter design is implemented to reduce size, then the device footprint is reduced, but the shielding effectiveness may be compromised
Solution Approach 1:
The patent uses vertical layering in the third dimension to achieve compact footprint while maintaining shielding effectiveness. Ground conductors on intermediate layers provide electromagnetic shielding between resonator layers, confining fields within the compact structure and preventing radiation leakage despite the reduced footprint
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 design achieves low insertion loss, compact size, and excellent shielding, enhancing bandwidth and reducing parasitic resonant frequencies, making it suitable for 5G applications with improved performance and reduced size compared to traditional filters.
Implementation Method 1
a first coupling area formed by only a partial overlap of the first resonator conductor and the second resonator conductor
Implementation Method 2
some bandpass filters are configured so that the plurality of the filter resonators are surrounded by a shield
Data Source
AI summary
Described is a bandpass filter comprising a multi-layered body, a first resonator conductor formed on a first layer of the body and a second resonator conductor formed on a second, tower layer of the body. The first resonator conductor and the second resonator conductor comprise a first coupling area formed by only a partial overlap of the first resonator conductor and the second resonator conductor. A length of each said resonator conductor is in the range of λg/3 to λg/5, where λg. is a center wavelength of the bandpass filter passband.