Cavity Filter Pressing Member for Stable Resonator Grounding
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Solution Overview
Problem
Current cavity filters in mobile communication systems face challenges in achieving stable grounding of dielectric resonators and reducing size to accommodate compact base stations, while maintaining high Q values and steep attenuation properties.
Innovation Solution
A cavity filter design that includes a housing with cavities, a cover, and a pressing member with an elastic silicone material to securely join the dielectric resonator to the ground, allowing for a smaller structure and stable resonance performance, using a coaxial resonator with a ceramic dielectric and metalizing at junctions for enhanced contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a coaxial resonator shape is altered to reduce size, then the cavity filter size is reduced, but it becomes difficult to achieve the required amount of size reduction for current compact base stations
Solution Approach 1:
The resonator is divided into two separate components: a coaxial resonator and a ceramic dielectric. This segmentation allows each component to be optimized independently, achieving size reduction while maintaining performance and avoiding excessive structural complexity
Solution Approach 2:
The ceramic dielectric is placed inside the housing cavity along with the coaxial resonator, creating a nested arrangement where the dielectric occupies the central space and the resonator surrounds it, maximizing space utilization and reducing overall filter size
2Reliability
If dielectric resonators are used to achieve high Q values, then filtering performance is improved, but stable grounding between the resonator and filter cover becomes difficult to achieve
Solution Approach 1:
A pressing member is introduced as an intermediary component between the dielectric resonator and the filter cover. This pressing member applies continuous pressure to ensure stable electrical contact and grounding, resolving the grounding stability issue while preserving the high Q value performance of the dielectric resonator
3Volume of moving object
If compact base stations are deployed to reduce equipment footprint, then space utilization is improved, but the cavity filters must be smaller which challenges performance requirements
Solution Approach 1:
The resonant frequency and electrical characteristics are adjusted by changing the parameters of the coaxial resonator dimensions and the ceramic dielectric properties (dielectric constant, dimensions). This allows the filter to maintain high Q values and steep attenuation properties even in a reduced-size configuration suitable for compact base stations
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 provides stable resonance performance and reduced size, enabling effective filtering with low loss and high sensitivity, suitable for compact base stations by ensuring secure grounding and efficient signal transmission.
Implementation Method 1
an elastic member, which may be joined to a lower portion of the insert part to press the thin part
Implementation Method 2
a cavity filter having a cavity-based structure is mainly used... performs the filtering by way of resonance in each of the cavities
Data Source
AI summary
A cavity filter is disclosed. The cavity filter includes: a housing in which at least one cavity is formed where the housing has a resonator held in the cavity; a cover joined to an upper portion of the housing; and a pressing member joined to the cover. An insertion area is formed in the cover for receiving the pressing member, where the insertion area includes a thin part that has a smaller thickness than the main body of the cover. The pressing member may be inserted in the insertion area to press the thin part. The pressing member includes an insert part that is inserted in the insertion area, and an elastic member that is joined to a lower portion of the insert part to press the thin part. The cavity filter can provide stable properties as the resonators are joined to the ground in a stable manner.