Tri-Mode Dielectric Cavity Filter With Wider Tuning Range
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Solution Overview
Problem
Traditional single-mode dielectric filters have high manufacturing costs and large volumes, and while triple-mode dielectric filters offer a solution, they face challenges such as limited tuning range, sensitivity to resonance frequencies, and increased processing costs due to the small distance between the dielectric resonance block and the cavity.
Innovation Solution
An irregular-shaped triple-mode cavity resonance structure with a cube-like cavity and a dielectric resonance block, where the ratio of the cavity's side length to the resonance block's side length is between 1.03 and 1.30, allowing for a higher Q value transition and reduced insertion loss, incorporating a coupling structure and frequency tuning device to adjust electromagnetic properties and resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ratio of cavity size to dielectric resonance block size is increased to achieve high Q value, then the Q value increases, but the filter volume increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the ratio K of cavity side length to dielectric resonance block side length within the range 1.01 ≤ K ≤ 1.30. This specific parameter range optimizes the Q value while minimizing filter volume, resolving the contradiction between high Q value and compact size.
Solution Approach 2:
The patent uses composite material structure combining dielectric resonance block with metal cavity walls coated by conductive material (such as silver). This composite structure achieves high Q value through the dielectric properties of the resonance block while the conductive coating minimizes energy loss at the cavity boundaries, enabling high performance in reduced volume.
2Volume of stationary object
If the distance between dielectric resonance block and cavity wall is reduced to minimize filter volume, then the volume decreases, but the sensitivity to resonance frequencies increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-setting the optimal distance range between the dielectric resonance block and cavity wall corresponding to the ratio K range. This preliminary design establishes tolerance boundaries that guide manufacturing, reducing sensitivity to frequency variations while maintaining compact volume.
Solution Approach 2:
The patent changes the distance parameter between dielectric resonance block and cavity wall to fall within the specific range defined by 1.01 ≤ K ≤ 1.30. This parameter optimization balances volume reduction with acceptable sensitivity to resonance frequencies, achieving both compact size and manufacturing feasibility.
3Volume of stationary object
If the distance between dielectric resonance block and cavity wall is reduced to minimize filter volume, then the volume decreases, but the tuning range of tuning screw is limited
Solution Approach 1:
The patent applies dimensionality change by providing tuning screws at multiple positions on the cavity wall rather than relying on a single tuning location. This multi-point tuning approach compensates for the limited tuning range caused by reduced distance between the dielectric block and cavity wall, maintaining adaptability while achieving compact volume.
Solution Approach 2:
The patent segments the tuning function by distributing multiple tuning screws at different locations on the cavity wall. This segmentation allows independent adjustment of different resonance modes, providing sufficient tuning range despite the compact overall structure and reduced dielectric-block-to-wall distance.
4Reliability
If traditional single-mode dielectric filters are used to achieve high Q value, then the Q value increases, but the manufacturing cost and volume increase
Solution Approach 1:
The patent merges multiple functions into a single dielectric resonance block that simultaneously supports triple-mode resonance (TE101, TE110, TM010 modes). This consolidation eliminates the need for separate single-mode filter components, reducing manufacturing cost and volume while achieving high Q value through the combined resonant modes.
Solution Approach 2:
The patent changes the operational mode from single-mode to triple-mode dielectric resonance, utilizing the dielectric constant and geometric parameters of the resonance block to simultaneously excite three different resonant modes. This parameter transformation enables high Q value performance with reduced component count and lower manufacturing cost.
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 reduces the filter's volume by 40% and insertion loss by 30%, simplifies manufacturing, and reduces sensitivity to resonance frequencies, thereby lowering production costs while maintaining high Q values.
Implementation Method 1
the dielectric resonance block and the dielectric support frame form a triple-mode dielectric resonance rod, and the triple-mode dielectric resonance structure generates triple-mode resonance in three directions along X, Y and Z axes of the cavity
Implementation Method 2
the triple-mode dielectric resonance structure is internally provided with a coupling structure for changing an orthogonal property of a degenerate triple-mode electromagnetic field in the cavity
Implementation Method 3
the triple-mode dielectric resonance structure is internally provided with a frequency tuning device for changing a resonance frequency of the degenerate triple-mode in the cavity
Data Source
Figure 1~2
Figure 3~4
AI summary
The disclosure discloses an irregular-shaped cavity multi-mode resonance structure and a filter with the resonance structure. The irregular-shaped cavity multi-mode resonance structure includes a cavity and a cover plate, wherein the cavity is internally provided with a dielectric resonance block and a dielectric support frame; at least one end face of the cavity is concave or convex, and at least one end face of the dielectric resonance block is convex or concave, the dielectric resonance block and the dielectric support frame form a triple-mode dielectric resonance rod; one end or any end of the cube-like dielectric resonance block is respectively connected with the dielectric support frame; the dielectric support frame is connected with an inner wall of the cavity; and the dielectric resonance block forms triple-mode resonance in three directions along the X, Y and Z axes of the cavity. The cavity filter disclosed by the disclosure ensures a high Q value when the resonance rod and the cavity are at a small distance apart, while also increasing the turning range of a tuning screw, and reducing sensitivity to resonance frequencies due to the small distance between the cavity and the dielectric resonance block, thereby facilitating production debugging and reducing production cost.