Ceramic Dielectric Band-Pass Filter With Integrated Notch Cavities
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Solution Overview
Problem
Conventional ceramic dielectric band-pass filters face challenges in achieving complex designs with limited out-of-band suppression and high manufacturing costs, necessitating improved frequency selectivity and suppression performance.
Innovation Solution
A ceramic dielectric band-pass filter integrating six first resonant cavities and two second resonant cavities, coupled with input and output electrodes to form a sixth-order band-pass filter and two notch filters, featuring a simple structure and enhanced out-of-band suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional band-pass filter structures are used, then the filter can achieve basic frequency selection, but the out-of-band suppression performance is limited
Solution Approach 1:
The patent combines a sixth-order band-pass filter structure with two notch filter structures into a single integrated ceramic dielectric filter. The six first resonant cavities form the band-pass filter, while two second resonant cavities are configured as notch filters to provide additional out-of-band suppression at specific frequency points, thereby enhancing overall suppression performance without requiring separate filter components
Solution Approach 2:
The filter is segmented into distinct functional modules: six first resonant cavities for band-pass filtering, two second resonant cavities for notch filtering, and input/output electrodes for signal coupling. Each resonant cavity is independently designed and positioned within the ceramic base, allowing optimized performance of each segment while maintaining overall system integration
2Reliability
If complex filter designs are implemented to improve out-of-band suppression, then suppression performance increases, but manufacturing cost increases
Solution Approach 1:
Multiple filter functions (band-pass and notch filtering) are merged into a single ceramic dielectric component, eliminating the need for multiple separate filters and reducing assembly costs. The integrated design allows all resonant cavities to be formed within one ceramic base, simplifying manufacturing processes and reducing overall system cost
Solution Approach 2:
The ceramic dielectric filter structure serves multiple functions simultaneously: frequency selection through band-pass filtering, out-of-band suppression through notch filtering, and signal coupling through input/output electrodes. This multi-functionality reduces the total component count and manufacturing complexity compared to using separate specialized filters for each function
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 filter achieves excellent out-of-band suppression performance with improved frequency selectivity, suitable for microwave communication systems, particularly in routers, wireless base stations, satellite communications, and navigation systems.
Implementation Method 1
The ceramic base comprises six first resonant cavities and two second resonant cavities. The six first resonant cavities and the two second resonant cavities penetrate the ceramic base from the open surface to the short-circuit surface.
Data Source
AI summary
A ceramic dielectric band-pass filter includes a ceramic base, a first input and output electrode, and a second input and output electrode. The ceramic base includes an open surface, a short-circuit surface, and an IO surface. The ceramic base includes first resonant cavities and second resonant cavities penetrating the ceramic base. The first resonant cavities are arranged between the second resonant cavities and are arranged along a length direction of the ceramic base. The first input and output electrode and the second input and output electrode are arranged on the IO surface and extend to the open surface. The first input and output electrode, the second input and output electrode, and the first resonant cavities are coupled to form a sixth-order band-pass filter. The first input and output electrode and the second input and output electrode are coupled with the second resonant cavities to form notch filters.