Multi-mode Bandpass Filter Triangular Aperture Coupling
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Solution Overview
Problem
Current multi-mode bandpass filters have limited bandwidth capabilities, typically achieving only approximately 5% fractional bandwidth due to constraints on hole depth and aperture size.
Innovation Solution
The design incorporates a through hole in each end slab and two triangular apertures at opposite corners of the slab-cube interface, increasing external coupling and bandwidth by configuring the resonator bodies as rectangular prisms with coupling aperture segments and a bullseye coupling structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional hole depth and aperture size constraints are used in multi-mode bandpass filters, then manufacturing simplicity is maintained, but bandwidth capability is limited to approximately 5% fractional bandwidth
Solution Approach 1:
The filter structure is divided into multiple resonator bodies (first resonator body, second resonator body, third resonator body) with distinct coupling structures between them. Each resonator body has specific aperture configurations (first aperture, second aperture, third aperture) that can be independently optimized, allowing bandwidth enhancement through segmented design while maintaining manageable complexity.
Solution Approach 2:
The patent introduces a through-hole dimension that penetrates the entire filter structure from first to third resonator bodies, adding a vertical coupling path. This through-hole dimension enables additional coupling mechanisms beyond the traditional planar apertures, significantly expanding bandwidth capability without proportionally increasing planar complexity.
2Adaptability or versatility
If multiple coupling structures are added to increase external coupling and bandwidth, then bandwidth capability is enhanced, but device complexity increases
Solution Approach 1:
The through-hole serves multiple functions simultaneously: it acts as a coupling structure between resonator bodies, provides a path for external signal coupling, and enables bullseye coupling configurations. This multi-functionality allows bandwidth enhancement without proportionally increasing the number of separate coupling structures, as one element (the through-hole) performs multiple coupling roles.
Solution Approach 2:
The patent combines multiple coupling mechanisms into an integrated structure where through-holes, apertures, and resonator bodies work together as a unified coupling system. The first, second, and third coupling structures are merged into a coherent design where the through-hole connects all resonator bodies, and apertures are strategically positioned to maximize coupling efficiency without requiring additional separate components.
3Adaptability or versatility
If conventional resonator configurations are used, then manufacturing simplicity is maintained, but external coupling and bandwidth are limited
Solution Approach 1:
Different regions of the filter structure have specialized configurations optimized for their specific functions: the first resonator body has first and second apertures for input coupling, the second resonator body has a through-hole for intermediate coupling, and the third resonator body has a third aperture for output coupling. This local optimization of coupling structures enhances external coupling capability while maintaining overall manufacturing feasibility through modular design.
Solution Approach 2:
The coupling structures are nested within the resonator bodies rather than being external additions. Through-holes are formed within the resonator bodies, and apertures are positioned on the surfaces of existing structures. This nesting approach enables enhanced coupling capability without significantly increasing the overall footprint or requiring separate manufacturing steps for coupling elements.
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
This configuration significantly enhances bandwidth capabilities while maintaining filter selectivity and reducing insertion loss, allowing for efficient multi-band implementations and improved performance in radio-frequency applications.
Implementation Method 1
Physical filters generally consist of a number of energy storing resonant structures with paths for energy to flow between these resonators and input/output ports
Data Source
AI summary
A multi-mode filter with a resonator having a plurality of resonator bodies which are rectangular prisms and the filter being configured with a through hole that electrically connects an input and an output to the center of a coupling structure between a respective pair of slabs. The multi-mode filter further comprising a plurality of coupling aperture segments which are coupling structures between each pair of resonator bodies or slabs such that two triangular apertures at opposite corners of at least two different slab-cube interfaces are utilized with the triangular apertures being diagonally opposed to one another across the respective interface.