Integrated Resonator Filter for Out-of-Band Spurious Suppression
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Solution Overview
Problem
Existing small size metal filters in mobile communication systems suffer from inadequate out-of-band spurious performance, leading to increased size, complexity, and cost due to separate metal and low-pass filter structures.
Innovation Solution
A filter design incorporating a housing with a cavity containing resonators of specific shapes and configurations, including first and second type resonators with distinct dimensions and orientations, connected via a coupling structure, to enhance out-of-band spurious performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate metal filter and low pass filter structures are used to improve out of band spurious performance, then radio performance is improved, but device size and structural complexity increase
Solution Approach 1:
The patent combines the metal filter and low pass filter into a single integrated filter structure. The resonators are designed with specific geometric features (enlarged portions and protruding portions) that simultaneously provide metal filter characteristics for stopband rejection and low pass filter characteristics for harmonic suppression, eliminating the need for separate filter structures while achieving both functions.
Solution Approach 2:
The resonators in the integrated filter perform multiple functions: they provide frequency selection, stopband rejection, and harmonic suppression simultaneously. The specific geometric configurations of the resonators enable them to act as both metal filter elements and low pass filter elements, making the filter structure universal in addressing multiple performance requirements.
2Reliability
If separate metal filter and low pass filter structures are used to improve out of band spurious performance, then radio performance is improved, but filter size increases
Solution Approach 1:
The patent merges the metal filter and low pass filter into one compact integrated structure, eliminating the space required for separate filter assemblies. The resonators are arranged within a single housing cavity, significantly reducing the overall filter volume while maintaining both metal filter and low pass filter functionalities.
3Reliability
If more resonators with complex shapes are used to improve out of band spurious performance, then radio performance is improved, but manufacturing complexity increases
Solution Approach 1:
The resonators feature localized geometric modifications (enlarged portions and protruding portions) at specific locations rather than complex overall shapes. This allows the resonators to achieve the desired electromagnetic characteristics while maintaining a relatively simple manufacturing process, as the complex features are confined to specific local areas of each resonator.
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 design achieves improved out-of-band spurious performance by suppressing high-order resonances, reducing size and complexity, and maintaining radio performance while integrating multiple channels in a compact form.
Implementation Method 1
A plurality of resonators disposed in the cavity, wherein the plurality of resonators comprises a first type resonator... to achieve better out of band spurious performance by suppressing high-order resonances
Data Source
AI summary
A filter includes a housing defining a cavity and a plurality of resonators in the cavity, wherein the plurality of resonators includes a first type resonator, the first type resonator includes a body that extends along a first direction, an enlarged portion that is provided at the top of the body and extends along a second direction substantially perpendicular to the first direction so as to have a larger width in the second direction than the body, and a protruding portion that is provided at an intermediate section of the body and extends from a lateral side of the body along the second direction, and an extended portion that extends at the top of the protruding portion along the first direction so as to have a larger width in the first direction than the protruding portion, wherein an input port and/or output port is connected to the protruding portion of the first type resonator.