Dielectric Resonator Band-Stop Filter for Low-Loss Miniaturization
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Solution Overview
Problem
Current band-stop filters have a large size and high insertion loss, failing to meet the industry's requirement for a small-size high-performance filter.
Innovation Solution
A band-stop filter design incorporating a waveguide transmission line with sequentially arranged dielectric resonance units, each comprising a dielectric block with a conductive layer covering its outer surface and a blind hole, utilizing materials with high dielectric constants to reduce size and minimize radiation loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional band-stop filter is used to remove specific frequency components, then the filter structure becomes complex and occupies large area, but the filtering function is achieved
Solution Approach 1:
The filter electrode is divided into multiple independent segments (first filter electrode segment and second filter electrode segment) that can be independently controlled. Each segment can be independently driven to generate specific acoustic waves, enabling complex filtering functions through simple structural components rather than complex filter structures.
Solution Approach 2:
The patent replaces conventional electronic filtering mechanisms with acoustic wave-based filtering. By using surface acoustic waves generated by interdigitated transducers and filter electrodes, the system achieves frequency-selective filtering through physical wave interference rather than electronic circuitry, simplifying the overall device structure.
2Manufacturing precision
If a conventional band-stop filter is used to remove specific frequency components, then the filtering function is achieved, but the filter occupies large area
Solution Approach 1:
The filtering function is merged with the existing acoustic wave propagation path. The filter electrodes are integrated along the acoustic wave transmission route between the interdigitated transducer and the photodetector, allowing filtering to occur in-line without requiring separate filter components or additional space.
Solution Approach 2:
The filter electrodes are arranged in a linear configuration along the acoustic wave propagation direction, utilizing the temporal dimension of wave propagation to achieve frequency filtering. This linear arrangement is more space-efficient than conventional planar filter structures that require two-dimensional electrode patterns.
3Manufacturing precision
If multiple electrodes are used to remove different frequency components, then comprehensive filtering is achieved, but power consumption increases
Solution Approach 1:
The filter electrodes are driven with periodic alternating voltages at specific frequencies that correspond to the acoustic wave frequencies to be filtered. By applying AC voltages at resonant frequencies, the system achieves efficient frequency-selective filtering through acoustic wave interference, consuming power only when specific frequencies need to be filtered rather than continuous power consumption.
Solution Approach 2:
The system achieves different filtering characteristics by changing the driving frequency and voltage parameters of the filter electrodes rather than using physically different electrode structures. By adjusting the electrical parameters (frequency, amplitude) of the applied voltages, the filter can adaptively target different frequency components, reducing the need for multiple permanently configured electrode sets.
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 a smaller filter size and reduced loss by using materials with high dielectric constants and conductive layers to seal electromagnetic waves, resulting in a compact and efficient band-stop filter.
Implementation Method 1
a surface acoustic wave is generated by an interdigitated transducer
Implementation Method 2
specific frequency components are removed from the surface acoustic wave by a band-stop filter
Data Source
Figure 1~2a
Figure 2b~2c
Figure 2d~3a
AI summary
This application relates to the field of communications component technologies, and provides a band-stop filter and an electronic device, which are used to resolve a problem that a band-stop filter has a large size and a large insertion loss. The band-stop filter includes: a waveguide transmission line, configured to transmit electromagnetic waves; and a plurality of dielectric resonance units, sequentially arranged along an extension track of the waveguide transmission line, and configured to be coupled to the waveguide transmission line, where the dielectric resonance units each include at least one dielectric resonator; the dielectric resonator includes a first dielectric block and a first conductive layer covering an outer surface of the first dielectric block; and a first surface of the first dielectric block has a blind hole, and the first conductive layer covers an inner surface of the blind hole; where a dielectric constant of a material that forms the first dielectric block is greater than 1.