Cross-Coupled Filter Structure for Compact Low-Loss Harmonic Suppression
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Solution Overview
Problem
Current filters used in small base stations for 5G communications face challenges in miniaturization, weight reduction, and cost-effectiveness, with dielectric waveguide filters offering low loss and harmonic characteristics but limited miniaturization potential, while metal coaxial filters have better performance but are costly to manufacture and prone to deformation.
Innovation Solution
A cross-coupled filter design featuring a resonant structure with alternating electrical and magnetic coupling modes between resonators, integrated frame assembly for ease of production, and adjustable coupling mechanisms to reduce size and improve harmonic suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If dielectric waveguide filter is used, then miniaturization and lightweight are achieved, but loss and harmonic characteristics deteriorate
Solution Approach 1:
The filter combines dielectric resonators for miniaturization with metal waveguide structures for low loss and good harmonic characteristics, creating a composite structure that leverages the advantages of both materials to resolve the contradiction between weight reduction and performance maintenance
2Loss of energy
If traditional metal coaxial filter is used, then loss and harmonic characteristics are improved, but size and weight reduction reaches a limit
Solution Approach 1:
The invention transitions from pure metal coaxial structure to a hybrid dielectric-metal structure, using dielectric resonators to replace portions of the metal structure, thereby achieving weight reduction while maintaining the low loss characteristics through careful design of the resonant coupling mechanism
3Ease of manufacture
If dielectric waveguide filter is used, then manufacturing cost is reduced, but production complexity increases due to deformation issues
Solution Approach 1:
The filter is divided into modular components including resonator assemblies and waveguide sections that can be manufactured separately and then assembled, reducing the complexity of single-piece manufacturing while maintaining dimensional accuracy and reducing deformation issues
4Object-generated harmful factors
If cross-coupling structure is implemented, then harmonic suppression is improved, but device complexity increases
Solution Approach 1:
The coupling structures serve multiple functions: they provide the necessary resonant coupling for filter operation, enable harmonic suppression through specific coupling configurations, and maintain structural compactness. The same resonator structures that enable miniaturization also facilitate cross-coupling for harmonic rejection, reducing overall device complexity
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 solution integrates the advantages of dielectric and metal coaxial filters, achieving miniaturization, low loss, and good harmonic characteristics while minimizing components and production costs, making it suitable for mass production and maintaining product quality.
Implementation Method 1
a resonant structure. The resonant structure includes a plurality of columns of resonant units, each column of resonant units including at least two resonators
Implementation Method 2
A dominant coupling mode of a coupling between two adjacent resonators in a same column is electrical coupling or magnetic coupling
Implementation Method 3
A dominant coupling mode of a coupling between two adjacent resonators in a same column is electrical coupling or magnetic coupling
Data Source
AI summary
A cross-coupled filter includes a resonant structure including a plurality of columns of resonant units, each column of resonant units includes at least two resonators. A dominant coupling mode of a coupling between two adjacent resonators in a same column is electrical coupling or magnetic coupling. Dominant coupling modes of a plurality of groups of two adjacent resonators in the same column alternate between electrical coupling and magnetic coupling. A dominant coupling mode of a coupling between two adjacent resonators in adjacent columns is electrical coupling or magnetic coupling. Dominant coupling modes of a plurality of groups of two resonators of two adjacent columns alternate between electrical coupling and magnetic coupling, to form at least a set of cross-coupling. The present disclosure realizes miniaturization and light weight in structural characteristics, and realizes low loss and good harmonic characteristics in electrical performance.