Multi-band Filter with Segmented Dielectric Resonators
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-band filters for portable digital terminals lack improved attenuation and band rejection characteristics, which are essential for effectively handling various wireless communication frequency bands.
Innovation Solution
A multi-band filter design incorporating a housing with band pass filter units, resonators made of dielectric material, and a coupling unit with feeding parts to enhance signal transmission and rejection, featuring a substrate as a ground and conductive films on resonators for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multi-band filter design is used, then the filter can handle multiple frequency bands, but the attenuation and band rejection characteristics are insufficient
Solution Approach 1:
The filter is divided into multiple independent resonators (first resonator and second resonator) with distinct functions. The first resonator handles the first frequency band with specific attenuation characteristics, while the second resonator handles the second frequency band with different attenuation characteristics. This segmentation allows each resonator to be optimized independently for its specific frequency band, improving overall attenuation and rejection performance without requiring a completely complex integrated structure.
Solution Approach 2:
Each resonator is designed with local quality optimizations tailored to its specific frequency band requirements. The first resonator has structural features optimized for the first frequency band's attenuation needs, while the second resonator has different structural features optimized for the second frequency band. This local quality approach enables each component to achieve optimal performance for its specific function rather than using a uniform design across all bands.
2Reliability
If multiple resonators with different attenuation characteristics are used, then attenuation and rejection characteristics improve, but manufacturing complexity increases
Solution Approach 1:
The filter structure is designed with universal components that can serve multiple functions. The housing structure accommodates different resonators, and the feeding parts can couple with multiple resonators using similar connection methods. The partition walls serve both as structural supports and as electromagnetic isolation barriers. This universality allows the system to handle multiple frequency bands with different attenuation requirements while using a standardized manufacturing platform, reducing overall manufacturing complexity despite the multi-band functionality.
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 provides enhanced attenuation and band rejection characteristics, enabling the use of multiple wireless communication services with a single antenna and simplifying manufacturing while minimizing interference and improving productivity.
Implementation Method 1
a resonator coupled to the substrate and including a conductive film coupled to at least one of end surfaces, in length direction, of the body in which a penetration hole is formed in one direction and a wall surface of the penetration hole
Implementation Method 2
The body may be made of a dielectric material and may have the penetration hole formed therein in one direction
Implementation Method 3
a plurality of band pass filter units provided in the housing and passing the signals in the preset frequency band therethrough between the antenna connector and the input/output connectors
Implementation Method 4
a coupling unit including a plurality of feeding parts so as to couple the antenna connector and each of the plurality of band pass filter units to each other
Data Source
AI summary
A multi-band filter is disclosed. The multi-band filter includes: a housing including an antenna connector connected to an antenna and a plurality of input/output connectors inputting/outputting signals transmitted and received through the antenna depending on a preset frequency band; a plurality of band pass filter units provided in the housing and passing the signals in the preset frequency band therethrough between the antenna connector and the input/output connectors; and a coupling unit including a plurality of feeding parts so as to couple the antenna connector and each of the plurality of band pass filter units to each other.