Planar Resonator Filter Layout for Slim RF Frequency Tuning
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Solution Overview
Problem
Conventional radio frequency filters face challenges in reducing size and weight due to their multi-cavity structure and requirement for additional conductive materials for inductive or capacitive coupling.
Innovation Solution
A filter design for communication devices featuring a tuning panel with multiple tuning bars in a single layer within a dielectric material-filled space, and a resonance substrate with resonators also in a single layer, allowing for frequency tuning by adjusting the separation distance between resonators and incorporating a notch forming part to enhance skirt characteristics without additional weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-cavity structure with resonators extending in the thickness direction is used, then frequency resonance and bandpass characteristics are achieved, but the filter thickness and overall size cannot be reduced
Solution Approach 1:
The patent transitions from a conventional multi-cavity structure with resonators extending in the thickness direction to a single-layer planar structure where resonators are arranged horizontally. This dimensional change allows the filter to achieve the required frequency resonance characteristics while significantly reducing the thickness direction dimensions, enabling slim filter design.
Solution Approach 2:
The patent embeds multiple functional elements (resonators, tuning bars, coupling structures) within a single-layer planar configuration. By nesting these components in the planar direction rather than stacking them in the thickness direction, the design achieves complex resonance functionality while maintaining minimal thickness.
2Reliability
If additional conductive materials are installed for inductive or capacitive coupling to reinforce skirt characteristics, then resonance period characteristics are improved, but the filter weight significantly increases
Solution Approach 1:
The patent merges the coupling function into the resonator structure itself by forming interdigitated electrode patterns that provide both resonance and coupling functionality. This integration eliminates the need for separate additional conductive coupling materials, achieving the required skirt characteristics while preventing weight increase.
Solution Approach 2:
The resonator structure is designed to perform multiple functions simultaneously: resonance generation, frequency tuning, and coupling between stages. The interdigitated electrode patterns serve both as resonating elements and as coupling structures, eliminating the need for dedicated additional conductive materials for coupling.
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 design enables a slim and lightweight filter with improved frequency tuning capabilities and reduced weight by eliminating the need for additional conductive materials, facilitating both manufacturing and performance enhancements.
Implementation Method 1
a resonator is a circuit element that resonates at a specific frequency by a combination of an inductor 1 and a capacitor C in an equivalent electronic circuit, and each resonator has a structure in which a dielectric resonance element (dielectric resonance element (DR)) or a metal resonance element is installed inside a cavity
Implementation Method 2
each resonator has a structure in which a dielectric resonance element (dielectric resonance element (DR)) or a metal resonance element is installed inside a cavity
Implementation Method 3
frequency tuning panel which includes a tuning frame having a plurality of tuning bar disposed as a single layer in the thickness direction within the dielectric material-filled space to adjust a separation distance between a plurality of resonators
Data Source
AI summary
The present disclosure relates to a communication device filter. Particularly, the communication device filter comprises: a filter body which is open in the thickness direction such that a part of a dielectric material-filled space is formed therein; a filter tuning cover coupled in the open thickness direction so as to cover the filter body, thereby forming the remainder of the dielectric material-filled space; a frequency tuning panel comprising a tuning frame having multiple tuning bars disposed in the dielectric material-filled space as a single layer with regard to the thickness direction so as to adjust the distance of spacing from multiple resonators disposed in the dielectric material-filled space; and a resonance substrate comprising a resonance frame disposed in the dielectric material-filled space such that the multiple resonators constitute a single layer with regard to the thickness direction.