Planar Interdigital Cavity Filter for Lower Size and Weight
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cavity filters in 5G/Massive MIMO systems are large and heavy, occupying more than 20% of the unit size and weight, posing challenges for size and weight reduction while maintaining performance.
Innovation Solution
A cavity filter design featuring a housing with a resonator arrangement comprising interdigital structured resonant components connected by connection strips, arranged in a common plane within the cavity, reducing size and weight while allowing for flexible design and cost reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cavity filters are used in 5G/Massive MIMO systems, then filtering performance is maintained, but the size and weight of the system increases significantly
Solution Approach 1:
The patent transitions from traditional three-dimensional cavity resonators to two-dimensional planar resonant structures. The resonant components are arranged in a common plane (x-y plane) rather than occupying volumetric space, effectively reducing the filter from 3D to 2D configuration. This dimensional reduction enables significant miniaturization while preserving the essential filtering functionality through planar interdigital resonator designs.
Solution Approach 2:
The patent extracts and removes the heavy conductive housing from the filter design, retaining only the essential resonant components that perform the filtering function. By eliminating the enclosing housing structure and keeping only the planar resonant elements mounted on a substrate, the design achieves dramatic weight reduction while maintaining the core filtering performance through the resonant components alone.
2Stability of the object's composition
If conventional cavity filters with housing are used, then structural stability is maintained, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges multiple discrete components into integrated planar structures. The resonant components, connection strips, and grounding elements are combined into unified planar configurations where connection strips serve dual purposes as both signal interconnects and grounding paths. This integration reduces the number of separate parts, simplifies assembly procedures, and lowers manufacturing complexity while maintaining structural integrity through the interconnected planar design.
3Measurement precision
If traditional resonator configurations are used, then resonant frequency control is achieved, but the filter occupies excessive space
Solution Approach 1:
The patent employs parameter optimization in the form of interdigital resonator designs with carefully controlled geometric parameters. By adjusting the dimensions, spacing, and configuration of the interdigital fingers, the resonant frequency is precisely controlled while the overall footprint is minimized. The connection strip dimensions and positioning are also optimized as adjustable parameters to achieve both frequency accuracy and compact area utilization.
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 size and weight reduction, facilitates easier manufacturing and tuning, and enhances flexibility, making it easier to integrate into 5G/Massive MIMO systems with improved performance and cost-effectiveness.
Implementation Method 1
A cavity filter is a resonant circuit that only allows certain frequencies of electromagnetic waves to pass. The resonator arrangement comprises a plurality of resonant components that are arranged in a common plane inside the cavity.
Data Source
AI summary
Embodiments of the present disclosure relate to a cavity filer. According to embodiments of the present disclosure, there is providing an improved cavity filter. The cavity filter comprises a housing which defines a cavity and a resonator arrangement which comprises a plurality of resonant components. The plurality of resonant components are arranged in a common plane inside the cavity. The plurality of resonant components comprises a first resonant component, a second resonant component and a third resonant component. The first, second and third resonant components are arranged in an interdigital structure and spaced apart from each other. At least two of the first, second and third resonant components are arranged to be connected through a connection strip. In this way, it reduces the size and weight of the filter. It also achieves cost reduction. Moreover, it is also more flexible do design.