Tm dual-mode dielectric resonator and tm dual-mode filter
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Solution Overview
Problem
Existing dual-mode filters face issues with high-order harmonics close to the passband, poor filter rejection, increased insertion loss due to low-pass filters, and complex manufacturing processes, which are not optimal for 5G communication requirements.
Innovation Solution
A TM dual-mode dielectric resonator with a three-ground-terminal configuration, featuring a cross-shaped dielectric resonator body with two perpendicular electric fields and a non-grounding end surface, utilizing an immediate grounding structure and metal sheet with stepped blind holes to accommodate thermal expansion, and a metal block for reduced frequency and improved assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional dual-mode resonator configuration is used, then the filter can achieve basic dual-mode operation, but the high-order harmonics are too close to the passband resulting in poor filter rejection
Solution Approach 1:
The patent applies asymmetry by configuring three grounding surfaces on three adjacent end surfaces of the dielectric resonator body while leaving the fourth end surface non-grounded. This asymmetric grounding configuration modifies the resonant modes and harmonic distribution, pushing high-order harmonics away from the passband and improving filter rejection performance.
Solution Approach 2:
The patent applies local quality by creating different electrical conditions at different locations of the resonator. Specifically, three end surfaces are grounded while one end surface is left non-grounded, creating localized electrical property variations that control the electromagnetic field distribution and improve harmonic suppression in specific frequency regions.
2Reliability
If a low-pass filter is added to solve the harmonics problem, then the filter rejection improves, but the overall insertion loss increases
Solution Approach 1:
The patent extracts the low-pass filter component from the overall filter system by implementing harmonic suppression directly within the dual-mode resonator structure itself. The asymmetric grounding configuration inherently suppresses high-order harmonics without requiring an external low-pass filter, thereby maintaining lower insertion loss while achieving the desired filter rejection.
3Reliability
If traditional dual-mode filter manufacturing process is used, then the filter can be assembled, but the manufacturing process is complicated and the intermodulation performance is poor
Solution Approach 1:
The patent merges the resonator body and grounding structures into a more integrated configuration. The three grounding surfaces are directly formed on the dielectric resonator body itself, reducing the need for separate grounding components and simplifying the assembly process while improving intermodulation performance through the optimized grounding configuration.
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
Enhances harmonic performance, reduces size and manufacturing complexity, and improves intermodulation performance, while maintaining efficient assembly and reducing components.
Implementation Method 1
having grounding surfaces connected with walls of the cavity so that two electric fields are formed in first and second directions perpendicular to each other
Implementation Method 2
TM dual-mode dielectric resonator
Implementation Method 3
the metal sheet is made of a metal material having a coefficient of expansion that is close to a coefficient of expansion of a dielectric material of the TM dielectric resonator body
Data Source
AI summary
A TM dual-mode dielectric resonator, comprising: a metal cavity; and a TM dielectric resonator body located in the cavity and having grounding surfaces connected with walls of the cavity so that two electric fields are formed in first and second directions perpendicular to each other, characterized in that, two end surfaces of the TM dielectric resonator body which are perpendicular to the first direction and a first end surface of the TM dielectric resonator body which is perpendicular to the second direction are configured as the grounding surfaces, and a second end surface of the TM dielectric resonator body which is perpendicular to the second direction is placed in a non-grounding state. The present disclosure also relates to a TM dual-mode filter comprising an above-said TM dual-mode dielectric resonator.