Dielectric Resonator Metal Layer Signal Leakage
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Solution Overview
Problem
Dielectric filters in base station modules face challenges in reducing signal leakage among open-circuit surfaces, improving outband suppression, and enhancing high-frequency suppression performance, particularly in harsh environments with narrow frequency band intervals.
Innovation Solution
A dielectric resonator design featuring an encirclement wall with a metal layer covering its outer and inner side surfaces, connected to a substrate via a metal layer, which isolates the cavity area from external space, reducing signal leakage and enhancing high-frequency suppression by pushing unwanted harmonics away.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a TEM mode dielectric filter is used with multiple dielectric resonators, then the filter can be compact and suitable for base station modules, but signal leakage occurs among open-circuit surfaces of the resonators
Solution Approach 1:
A conductive layer is introduced as an intermediary between adjacent dielectric resonators. This conductive layer acts as a shield that blocks electromagnetic field coupling between resonators, thereby preventing signal leakage while maintaining the compact filter structure.
Solution Approach 2:
The harmful electromagnetic fields causing signal leakage are extracted and redirected to ground through the conductive layer. By providing a dedicated path to ground, the interfering fields are removed from the signal path between resonators.
2Volume of moving object
If the frequency band interval between transmit and receive filters is narrow, then the duplexer can be compact, but it becomes difficult to achieve transmit and receive isolation above 80 dBc
Solution Approach 1:
The conductive layer serves as a mediator that provides electromagnetic shielding between transmit and receive signal paths. This shielding effect maintains high isolation performance even when the frequency band interval is narrow, allowing compact duplexer design without sacrificing reliability.
3Device complexity
If conventional dielectric resonators are used, then the filter structure is simple, but outband suppression performance and high frequency suppression performance are difficult to improve
Solution Approach 1:
The conductive layer acts as an intermediary that suppresses unwanted electromagnetic modes and harmonics. By strategically positioning this layer, the patent achieves improved outband and high frequency suppression performance without significantly complicating the overall resonator structure.
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 effectively reduces signal leakage and improves high-frequency suppression performance, achieving better isolation and reliability in harsh base station environments.
Implementation Method 1
an encirclement wall, wherein the encirclement wall encircles a cavity area, and a metal layer is covered on an outer side surface of the encirclement wall and an inner side surface of the encirclement wall
Implementation Method 2
a dielectric resonator and a substrate, wherein the dielectric resonator includes a body and an encirclement wall, wherein the encirclement wall encircles a cavity area
Data Source
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AI summary
This application provides a dielectric resonator, including a body and an encirclement wall, where the encirclement wall is saliently disposed on a surface of the body, the encirclement wall encircles the surface of the body to form a cavity area, the encirclement wall isolates the cavity area from external space of the encirclement wall, and the encirclement wall includes a top surface, an inner side surface, and an outer side surface, where the inner side surface and the outer side surface are disposed opposite to each other and both connected between the top surface and the body, the top surface is located on a surface, away from the body, of the encirclement wall, the inner side surface is a surface, which faces the cavity area, of the encirclement wall, the outer side surface faces the external space of the encirclement wall, the top surface is covered with a metal layer, and the inner side surface and/or the outer side surface is also covered with a metal layer. This application further provides a filter. The dielectric resonator improves leakage among open-circuit surfaces of the filter, and helps to push a harmonic away and improve high frequency suppression performance.