BAWR Ladder-Bridge-Ladder Filter for Multi-Band RF Integration
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Solution Overview
Problem
In the analog RF region of mobile communication, the increasing number of passive components required for various frequency bands leads to a proportional increase in space and complexity, necessitating a more efficient filtering solution.
Innovation Solution
A Dual Input, Dual Output filtering apparatus utilizing Bulk Acoustic Wave Resonators (BAWRs) connected in series and parallel configurations, with specific ladder and bridge arrangements, to achieve distinct resonant frequencies and reduce component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of passive components is increased to support various frequency bands, then the frequency coverage is improved, but the area and complexity of the system increase proportionally
Solution Approach 1:
The patent combines multiple filtering functions into a single integrated filter structure using BAWR resonators arranged in series and parallel configurations. This merging approach allows the filter to handle multiple frequency bands simultaneously without requiring separate passive components for each band, thereby reducing the overall system area while maintaining broad frequency coverage capability
Solution Approach 2:
The BAWR-based filter structure is designed to perform multiple filtering functions across different frequency bands within a single device. By configuring BAWR resonators in specific series and parallel arrangements, the filter can selectively pass or block multiple frequency bands, making it a universal solution that replaces multiple band-specific filters and reduces the total component count
2Adaptability or versatility
If the number of passive components is increased to support various frequency bands, then the frequency coverage is improved, but the device complexity increases proportionally
Solution Approach 1:
The patent merges multiple filtering operations into a single integrated circuit structure using BAWR resonators. Instead of implementing separate filter circuits for different frequency bands, the invention uses a unified BAWR-based architecture where resonators are connected in series and parallel to achieve multi-band filtering in one device, significantly reducing circuit complexity
Solution Approach 2:
The patent achieves different filtering characteristics for various frequency bands by changing the parameters of the BAWR resonators, such as their resonant frequencies, quality factors, and connection configurations. By adjusting these parameters, the same basic circuit topology can handle multiple frequency bands without requiring complex switching or reconfiguration mechanisms, thereby simplifying the overall device complexity
3Reliability
If more passive components are used, then the filtering performance for various bands is improved, but the size and cost of the system increase
Solution Approach 1:
The patent merges the functionality of multiple discrete passive components into a single BAWR-based filter module. By integrating series and parallel BAWR resonator configurations, the filter achieves comprehensive filtering performance across multiple bands while using fewer physical components, directly reducing the quantity of substances and materials required
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 solution reduces the number of components, enhances circuit robustness against loss and noise, minimizes size and cost, and improves performance while adjusting impedance characteristics without additional circuit components.
Implementation Method 1
a plurality of Bulk Acoustic Wave Resonators (BAWRs) configured to be connected in series and in parallel
Implementation Method 2
Each of the plurality of BAWRs may comprise an air gap to be formed on a Low Temperature Oxide (LTO) located on silicon, or formed on silicon located on a first metal electrode, a support to be formed on the air gap using a dielectric substance, a second metal electrode to be formed on the support, a piezoelectric material to be formed on the second metal electrode
Data Source
AI summary
A Dual Input, Dual Output filtering apparatus using a Bulk Acoustic Wave Resonators (BAWR), and a resonator used as the BAWR may be provided. A Dual Input, Dual Output filtering apparatus may include a plurality of BAWRs connected in series and parallel.