Multimode Strip Line Multiband Filter for Compact 5G Radio Units
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Solution Overview
Problem
Existing multiband filters for base stations in 5G communication systems are bulky and heavy, making them difficult to integrate into smaller, lighter radio units, and traditional methods of combining multiple frequency bands result in increased size and weight, complicating soldering onto printed circuit boards.
Innovation Solution
A multiband filter design utilizing a plurality of multimode strip line resonators with grounding parts and non-grounding branches, integrated into a chassis or a multi-layer circuit board, allowing for multiple frequency bands to be combined efficiently, with separate tuning capabilities and flexible assembly options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional multiband filters combine two or more filters of different frequency bands by a common cavity, then multiple frequency bands can be handled, but the filter unit becomes big and heavy, making it difficult to solder onto a PCB
Solution Approach 1:
The filter unit is divided into multiple independent single-band filter modules, each handling a specific frequency band. These modular filters are arranged in parallel between the input and output, eliminating the need for a large common cavity while maintaining multiband functionality. Each module can be independently designed and manufactured, reducing overall weight and size.
Solution Approach 2:
The patent transitions from a three-dimensional common cavity structure to a planar parallel arrangement of multiple two-dimensional filter modules. This dimensional change allows the multiband filter to achieve compact size suitable for PCB mounting while maintaining the ability to handle multiple frequency bands simultaneously.
2Adaptability or versatility
If traditional multiband filters combine two or more filters of different frequency bands by a common cavity, then multiple frequency bands can be handled, but the filter unit becomes big and heavy
Solution Approach 1:
The filter system is segmented into multiple independent single-band filter modules rather than using a single integrated multiband cavity. This segmentation reduces the overall weight while maintaining multiband functionality, as each module can be optimized for minimal weight while performing its specific frequency band function.
Solution Approach 2:
Each filter module is designed to be a universal building block that can be independently configured for different frequency bands. The same basic module structure serves multiple functions across different bands, reducing total weight compared to a single large multiband cavity that must accommodate all bands simultaneously.
3Volume of moving object
If small size metal filters use metal integration air-strip line resonator, then size and weight are reduced compared with traditional coaxial resonator, but combining multiple filters still results in increased size
Solution Approach 1:
Multiple single-band filter modules are merged into a single parallel configuration between the input and output ports. This merging approach maintains the compact size of individual air-strip line resonator modules while achieving multiband functionality through their combined parallel operation, avoiding the need for complex hierarchical combinations.
Solution Approach 2:
The patent arranges multiple compact two-dimensional filter modules in a planar parallel configuration rather than stacking them in three dimensions or using complex spatial arrangements. This planar arrangement maintains minimal size while simplifying the combination structure for easy PCB integration.
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 reduces radio size and weight, improves front-end performance, enhances reliability, and allows for flexible assembly, while maintaining high harmonic and insertion loss performance.
Implementation Method 1
each of the multimode resonators is a strip line resonator comprising a grounding part and two or more non-grounding branches for achieving multiple modes
Data Source
AI summary
The present invention relates to a multiband filter and a communication device. The multiband filter includes a plurality of multimode resonators, wherein each of the multimode resonators is a strip line resonator including a grounding part and two or more non-grounding branches for achieving multiple modes.