Folded Cavity Filter Structure for Lower Insertion Loss
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Solution Overview
Problem
Conventional radio frequency filters face challenges in reducing size and weight due to the need for complex joining processes and additional conductive components, which also lead to increased insertion loss.
Innovation Solution
A filter for communication devices is designed with a conductive base plate that can be folded to form a cavity, eliminating the need for conventional joining processes and allowing resonators to protrude into the cavity, thereby reducing insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional joining processes are used to form a cavity and position resonators, then structural stability is improved, but manufacturing complexity and insertion loss increase
Solution Approach 1:
The base plate is designed as a single integrated conductive component that simultaneously forms the cavity structure and positions the resonators through its folded configuration, eliminating the need for separate joining processes and multiple discrete parts
Solution Approach 2:
The base plate utilizes a foldable thin-walled structure that can be bent and folded to form the three-dimensional cavity and resonator positioning features, reducing manufacturing complexity while maintaining structural integrity
2Reliability
If additional conductive components are installed for coupling, then coupling characteristics are improved, but weight increases
Solution Approach 1:
The coupling structures are integrated directly into the base plate through folding, eliminating the need for separate conductive coupling components and thereby reducing overall weight while maintaining coupling functionality
Solution Approach 2:
The base plate serves multiple functions simultaneously: it forms the cavity enclosure, positions the resonators, and provides coupling paths between resonators through its folded geometry, reducing the need for additional dedicated components
3Manufacturing precision
If resonators are positioned using conventional methods, then positioning precision is improved, but manufacturing time increases
Solution Approach 1:
The base plate is pre-formed with integrated folding features and positioning structures that automatically align resonators during assembly, eliminating the need for time-consuming post-assembly positioning adjustments
Solution Approach 2:
The positioning structures for resonators are integrated into the base plate geometry itself through folding, allowing resonators to be positioned precisely without requiring separate positioning components or complex assembly procedures
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 enables a reduction in the thickness and weight of the filter, improving communication reliability by minimizing insertion loss and allowing for a slimmer product design.
Implementation Method 1
a base plate made of a conductive material, and manufactured in an unfolded state, the base plate being configured foldable such that, upon folding, a cavity is formed inside
Implementation Method 2
Each resonator has a structure in which a dielectric resonance element (DR) or a metallic resonance element is installed in a cavity... allowing only an electromagnetic field of a unique frequency corresponding to a processing frequency band to exist within the associated cavity
Data Source
AI summary
Disclosed herein may be a filter for communication devices. The filter may include a base plate that is made of a conductive material, manufactured in an unfolded state and configured to be foldable such that, upon folding, a cavity is formed inside while simultaneously positioning a plurality of resonators to protrude by a set length in a thickness direction or a width direction in the cavity. The plurality of resonators may each include, at a distal end portion thereof, a resonance characteristic end that is flat to form a layer identical to a remaining portion in the cavity and has a greater width than the remaining portion. The aforementioned configuration provides advantages of facilitating a slim product design, reducing insertion loss, and enhancing resonance characteristics.