Integrated Dielectric Filter Structure for Harmonic Suppression
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Solution Overview
Problem
Dielectric filters in communications devices face challenges with poor harmonic suppression and high layout space consumption due to the difficulty in matching between different filters and the need for additional low-pass filters.
Innovation Solution
A dielectric filter design incorporating both wideband and narrowband filtering structures within the same dielectric body, utilizing a conductive layer and resonators to enhance harmonic suppression and reduce mutual interference, while eliminating the need for separate low-pass filters, thus simplifying the manufacturing process and reducing layout space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a low-pass filter is cascaded with the dielectric filter to improve harmonic suppression, then the harmonic suppression ability is improved, but the device complexity and layout space consumption increase
Solution Approach 1:
The patent combines wideband filtering structure and narrowband filtering structure into a single integrated dielectric filter body. The wideband filtering structure suppresses far-end harmonics while the narrowband filtering structure provides additional harmonic suppression, eliminating the need for cascaded low-pass filters and reducing overall device complexity.
Solution Approach 2:
The integrated dielectric filter performs multiple functions simultaneously: wideband filtering for far-end harmonic suppression, narrowband filtering for additional harmonic rejection, and bandpass filtering for signal selection. This multi-functionality replaces what would traditionally require multiple separate filter components.
2Object-generated harmful factors
If a low-pass filter is cascaded with the dielectric filter to improve harmonic suppression, then the harmonic suppression ability is improved, but the matching difficulty between different filters increases
Solution Approach 1:
By merging the wideband and narrowband filtering structures into a single integrated dielectric filter body with continuous structure, the patent eliminates the matching interface between separate filters. The integrated design ensures seamless signal transmission and consistent performance without the complexity of matching cascaded filters.
3Object-generated harmful factors
If separate low-pass filter is added to the dielectric filter, then the harmonic suppression is improved, but the layout space consumption increases
Solution Approach 1:
The patent merges the wideband filtering structure and narrowband filtering structure into a single integrated dielectric filter body, eliminating the need for separate low-pass filter components and their associated PCB mounting space, thereby significantly reducing layout space consumption.
Solution Approach 2:
The narrowband filtering structure is nested within the same dielectric body as the wideband filtering structure, with the narrowband structure's passband within the wideband structure's passband. This nesting arrangement allows both filtering functions to coexist in a compact integrated form.
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 integrated dielectric filter effectively suppresses far-end harmonics, improves frequency precision, and reduces mutual interference between base stations, while minimizing echo deterioration and layout space consumption.
Implementation Method 1
The first resonator includes a through hole and an open loop. The through hole penetrates the bottom of the groove and a second surface of the dielectric body... The narrowband filtering structure includes at least one second resonator
Implementation Method 2
a surface of the dielectric body is covered with a conductive layer
Data Source
AI summary
A dielectric filter, a duplexer, and a communications device are provided. The dielectric filter includes a dielectric body, and a wideband filtering structure and a narrowband filtering structure that are disposed in the dielectric body. The wideband filtering structure includes a groove disposed on a first surface of the dielectric body and configured to adjust a frequency position of a passband of the wideband filtering structure; and at least one first resonator including a through hole penetrating the bottom of the groove and a second surface of the dielectric body; and an open loop located on a bottom surface of the groove and is disposed around an opening of the through hole. The narrowband filtering structure includes at least one second resonator including a blind hole disposed on the second surface of the dielectric body. The first surface and the second surface of the dielectric body are disposed oppositely.