Dielectric Resonator Layout for Low-Loss Thin Filter Coupling
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Solution Overview
Problem
Current stacked resonators face challenges in reducing both conductor loss and thickness while maintaining effective coupling, as ground electrodes or shield electrodes can lead to increased eddy current loss when trying to minimize thickness.
Innovation Solution
The design incorporates via conductors that extend orthogonally to ground electrodes, forming interdigital couplings with capacitor electrodes to reduce conductor loss and achieve a smaller size, with the via conductors connected to corresponding capacitor electrodes to lower resonance frequency and further reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If ground electrodes or shield electrodes are arranged in the stack direction to reduce resonator thickness, then the thickness is reduced, but eddy current loss increases due to opposition between resonance electrodes and ground electrodes
Solution Approach 1:
The patent repositions the ground electrodes from the stack direction (vertical dimension) to the lateral direction (horizontal dimension), allowing resonance electrodes to extend in the stack direction without opposition from ground electrodes. This dimensional change enables simultaneous reduction of thickness and conductor loss by eliminating the eddy current issue while maintaining compact form factor.
Solution Approach 2:
The resonator is divided into multiple resonance electrodes that are stacked in the vertical direction, with each electrode contributing to the resonant structure. This segmentation allows the resonance path to extend vertically without requiring ground electrodes in the stack direction, thereby reducing eddy current loss while achieving compact thickness.
2Reliability
If interdigital coupling is used to achieve strong coupling between resonators, then coupling strength is improved, but device complexity increases due to precise positioning requirements
Solution Approach 1:
The patent combines electric field coupling and magnetic field coupling mechanisms into a unified interdigital coupling structure. By having resonance electrodes from adjacent resonators interdigitate (alternate positions), both coupling mechanisms work simultaneously, achieving strong overall coupling while the symmetric structure naturally provides tolerance to positioning variations.
Solution Approach 2:
The resonance electrodes are designed with asymmetric extension patterns where electrodes from different resonators extend to different positions, creating the interdigital coupling configuration. This asymmetric design enables strong coupling while the overall symmetric arrangement of the coupled resonators provides robustness against manufacturing tolerances.
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 reduces conductor loss and achieves a smaller size by avoiding direct opposition between resonance and ground electrodes, allowing for stronger coupling and a lower resonance frequency, thus satisfying both loss reduction and thickness minimization.
Implementation Method 1
a first resonator and a second resonator provided in a dielectric block, in parallel to each other, so as to be electromagnetically coupled to each other. Each of the first resonator and the second resonator includes: a first ground electrode and a second ground electrode provided on or in the dielectric block so as to oppose each other; a first via conductor provided in the dielectric block so as to extend in a direction orthogonal to faces of the first and second ground electrodes
Implementation Method 2
a second via conductor interdigitally-coupled with the first via conductor, and provided in the dielectric block so as to extend in the direction orthogonal to faces of the first and second ground electrodes
Data Source
AI summary
A resonator includes: a dielectric block; first and second ground electrodes provided on or in the dielectric block, and disposed to oppose each other; a first via conductor provided in the dielectric block orthogonally to the first and second ground electrodes, and having a short-circuit end connected to the first ground electrode and an open end extending toward the second ground electrode; a second via conductor interdigitally-coupled with the first via conductor, and provided in the dielectric block orthogonally to the first and second ground electrodes, and having a short-circuit end connected to the second ground electrode and an open end extending toward the first ground electrode; a first capacitor electrode provided in the dielectric block, and connected to the first via conductor; and a second capacitor electrode provided in the dielectric block, and connected to the second via conductor.