RF Monoblock Filter with Dielectric Core and Side Surface Lid Filter
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Solution Overview
Problem
Current RF signal filters face challenges in providing sufficient attenuation of harmonic frequencies, which are integer multiples of the target passband frequencies, especially with the increasing demand for higher frequency selectivity and band isolation in wireless communication devices.
Innovation Solution
A composite RF filter assembly is designed with a monoblock filter and a lid filter, where the lid filter is mounted on top of the monoblock filter, featuring a dielectric core with specific metallization patterns and conductive electrodes to enhance signal rejection and attenuation of harmonic frequencies beyond 12 GHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If more space-taking resonators are added to improve signal rejection, then harmonic attenuation is improved, but device size increases
Solution Approach 1:
The patent places a second filter on the side surface of the dielectric core, utilizing the lateral dimension rather than only the top surface. This dimensional transition allows additional filtering functionality without significantly increasing the footprint area, effectively adding harmonic rejection capability while maintaining compact form factor.
Solution Approach 2:
The dielectric core serves multiple functions: it provides the structural body for the first filter, supports the second filter on its side surface, and acts as the resonator housing. This multi-functionality consolidates what would traditionally require separate components into a single integrated structure, improving harmonic rejection without proportionally increasing size.
2Object-affected harmful factors
If greater insertion loss is allowed to improve frequency selectivity, then band isolation is improved, but signal quality deteriorates
Solution Approach 1:
The patent extracts the harmonic filtering function from the main signal path resonators and implements it through a separate second filter on the side surface. This separation allows the second filter to target and remove harmonic frequencies without interfering with the main passband signal transmission, achieving band isolation while minimizing impact on signal quality.
Solution Approach 2:
The second filter acts as an intermediary component that specifically targets harmonic frequencies before they can cause interference. By positioning it on the side surface and configuring it with appropriate resonators, it mediates between the main filter and the output, providing additional frequency selectivity without requiring the main resonators to operate at compromised performance levels.
3Object-affected harmful factors
If a second filter is added to improve harmonic attenuation, then frequency selectivity is improved, but device complexity increases
Solution Approach 1:
The patent merges the second filter structure with the dielectric core by positioning it on the side surface and integrating the resonators into the same structural framework. This consolidation shares common materials (dielectric core), support structures, and packaging, thereby reducing the complexity increase that would normally accompany the addition of a second filter.
Solution Approach 2:
The second filter is nested on the side surface of the dielectric core, with its resonators positioned within or adjacent to the core structure. This nesting arrangement allows the second filter to utilize the same physical envelope and support infrastructure as the first filter, adding harmonic rejection functionality while minimizing the increase in overall structural complexity.
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 composite filter assembly provides improved signal rejection and attenuation of harmonic frequencies, allowing for more compact designs and efficient filtering of frequencies up to 12 GHz, while maintaining a compact form factor and reducing insertion loss.
Implementation Method 1
the resonators are formed by typically cylindrical passages, called through-holes, extending through the block from the long narrow side to the opposite long narrow side. The block is substantially plated with a conductive material (i.e. metallized) on all but one of its six (outer) sides and on the inside walls formed by the resonator through-holes.
Implementation Method 2
The reactive coupling between adjacent resonators is dictated, at least to some extent, by the physical dimensions of each resonator, by the orientation of each resonator with respect to the other resonators, and by aspects of the top surface metallization pattern.
Data Source
AI summary
An RF filter assembly comprising two filters. In one embodiment, the RF filter assembly comprises a core of dielectric material including a plurality of through-holes and a surface-layer pattern of conductive areas on a top surface of the core that define a first RF filter and a second RF low pass filter is defined, and extends between respective conductive input/output electrodes, on a wall that protrudes outwardly and upwardly from a top surface of the RF filter assembly.