Reconfigurable Microacoustic Filter for Precise Multi-Band Tuning
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Solution Overview
Problem
Current microacoustic filters in wireless communication devices lack precision and flexibility to adjust frequency bands effectively, leading to interference issues due to the increasing density of usable frequency bands and the need for higher data transmission rates.
Innovation Solution
A reconfigurable microacoustic filter design featuring a series resonator, a parallel path with a parallel resonator connected to ground, and an adjustable capacitive element, allowing for precise adjustments in characteristic frequencies and pole positions without significantly altering the transmission characteristic, using SAW, BAW, or GBAW resonators and adjustable impedance elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adjustable filters with shifted passbands are used to operate multiple frequency bands, then the number of operable frequency bands increases, but the precision and accuracy of filter adjustment deteriorates
Solution Approach 1:
The filter uses reconfigurable resonators with adjustable resonant frequencies that can be dynamically tuned within specific frequency ranges. This dynamic adjustment capability allows the filter to adapt to multiple frequency bands while maintaining precise control over the resonant frequencies, thereby resolving the contradiction between versatility and precision.
Solution Approach 2:
The filter adjusts its characteristics by changing the resonant frequencies of the resonators and the positions of poles and zeros within specific ranges. By modifying these parameters independently and precisely, the filter can operate across multiple frequency bands while maintaining accurate frequency selection, thus resolving the contradiction between adaptability and measurement precision.
2Adaptability or versatility
If the density of usable frequency bands increases to provide more functionality, then the number of frequency bands increases, but interference between adjacent bands worsens
Solution Approach 1:
The filter applies local quality by allowing independent adjustment of resonant frequencies and pole positions for different frequency bands. Each resonator can be precisely tuned to its optimal frequency, and poles can be positioned to provide targeted attenuation in specific frequency ranges, thereby minimizing interference between adjacent bands while supporting high frequency band density.
3Productivity
If adjustable filters are used to transmit data in different frequency bands, then data transmission capability increases, but the ability to provide variable poles with flexible positioning deteriorates
Solution Approach 1:
The filter employs dynamically reconfigurable resonators whose resonant frequencies can be adjusted independently. This dynamic capability enables the filter to provide variable poles that can be positioned flexibly within specific frequency ranges, supporting both high data transmission capability through carrier aggregation and adaptable pole positioning for different transmission scenarios.
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
Enables precise and flexible adjustment of filter properties, minimizing interference and supporting carrier aggregation by allowing local optimizations of the transfer function with minimal global changes, effectively handling multiple frequency bands with unchanged filter functionality.
Implementation Method 1
Microacoustic filters are HF filters that work with acoustic waves and generally comprise a piezoelectric material as well as electrode structures connected thereto
Implementation Method 2
SAW resonators (SAW=surface acoustic waves), BAW resonators (BAW=bulk acoustic wave) or GBAW resonators (GBAW=guided bulk acoustic wave) come into consideration as resonators
Data Source
AI summary
A reconfigurable microacoustic filter is specified which comprises a ladder-type-like filter topology and a suitably placed adjustable capacitive element.