Ceramic Filter Window Coupling for Resonator Isolation
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Solution Overview
Problem
Conventional ceramic filters face limitations due to their large size, restricted design options, and undesired resonator couplings, which hinder efficient interference reduction and miniaturization in radio equipment.
Innovation Solution
The introduction of a ceramic duplex filter with window couplings and crenellations allows for selective resonator coupling between adjacent blocks, reducing unwanted couplings and enabling improved filter response through increased transmission zeroes and precision manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional ceramic monoblock filters use straight-line resonator coupling, then manufacturing is simplified, but filter design options and achievable filter response are limited
Solution Approach 1:
The patent transitions from one-dimensional straight-line resonator coupling to two-dimensional coupling paths by introducing window openings that allow resonators to couple across adjacent ceramic blocks. This enables skip-resonator field couplings and non-linear coupling paths, dramatically expanding filter design options while maintaining manufacturing simplicity through modular block assembly.
2Device complexity
If ceramic filters use in-line resonator architecture, then coupling between resonators is constrained, but unwanted inter-resonator couplings occur due to unconstrained fields
Solution Approach 1:
The patent extracts and removes unwanted electromagnetic fields by introducing window openings that selectively block field paths between non-adjacent resonators. The windows are strategically positioned to eliminate skip-resonator couplings and other unwanted inter-resonator interactions, reducing harmful couplings while preserving necessary coupling paths.
3Adaptability or versatility
If ceramic duplex filters use adjacent blocks, then coupling between resonators in different blocks is needed, but unwanted coupling between non-adjacent through-holes occurs
Solution Approach 1:
The patent applies local quality by making the ceramic blocks non-uniform through strategic placement of window openings. The windows are positioned at specific locations to enable desired coupling between adjacent through-holes in different blocks while simultaneously blocking unwanted coupling paths between non-adjacent through-holes. This localized modification of field distribution achieves selective coupling control.
4Manufacturing precision
If conventional ceramic filters are made large, then reliable manufacture is easier, but miniaturization is limited
Solution Approach 1:
The patent divides the filter into multiple smaller ceramic blocks that can be manufactured with higher precision and reliability. Each block contains a subset of resonators and couples with adjacent blocks through window openings. This segmentation enables miniaturization while maintaining manufacturing precision, as each individual block is smaller and easier to manufacture reliably than a single large monoblock filter.
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 approach results in smaller, more precise ceramic filters with enhanced filter response and reduced unwanted couplings, facilitating better interference reduction and easier manufacturing.
Implementation Method 1
A peripheral window is disposed between the adjoined blocks to limit or tune coupling between adjacent through-holes of the adjoined blocks
Implementation Method 2
an in-line window located within a block of the pair of blocks and disposed between adjacent through-holes of the block to limit or tune coupling between the adjacent through-holes
Implementation Method 3
a crenellation on the side surface of a block of the pair of blocks to limit or tune coupling between adjacent through-holes within the block and to reduce coupling between non-adjacent through-holes within the block
Data Source
AI summary
The present application is directed to a filter and methods of transmitting a signal through the filter. The filter includes a pair of adjoined blocks of dielectric material. A top surface of each block has a conductive patterned region. The filter also includes plural spaced apart through-holes extending through each block from the top surface to a bottom surface. The through-holes are partially surrounded by the patterned region. The filter also includes a peripheral window disposed between the adjoined blocks to permit a coupling between adjacent through-holes of the adjoined blocks. The filter also includes an in-line window and/or a crenellation located within a block of the pair of blocks and disposed between adjacent through-holes of the block to limit or tune coupling between the adjacent through-holes. The application is also directed to a system including a printed circuit board and a filter.