Split Electroacoustic Resonator Detuning for Flatter Passbands
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Solution Overview
Problem
Long resonators in wireless communication systems experience performance degradation due to in-band resonance issues, particularly in passband performance, caused by interactions with self-inductances from connection pads and anti-parallel current flow.
Innovation Solution
The implementation of split resonators with a detuned resonance section, where the detuned resonator is positioned further from the input and output, and has a different electrode structure pitch to compensate for the inductance, thereby reducing resonance spikes and improving filter characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long resonator is used in the filter circuit, then the filter can achieve the required frequency response, but in-band resonance problems occur that interfere with passband performance
Solution Approach 1:
The patent divides a single long resonator into multiple shorter resonator sections (first resonator section, second resonator section, third resonator section) connected in series. This segmentation eliminates the in-band resonance problems associated with long resonators while maintaining the required frequency response characteristics through coordinated design of the sections with different electrode structure pitches
Solution Approach 2:
Different resonator sections are designed with different electrode structure pitches tailored to their specific positions and functions. The first section has a pitch for the first resonance frequency, the second section has a different pitch for the second resonance frequency, and the third section has yet another pitch. This local differentiation allows each section to contribute differently to the overall filter response, eliminating harmful in-band resonance while maintaining passband performance
2Ease of manufacture
If the resonator is designed with standard electrode pitch, then manufacturing is simplified, but resonance spikes occur that degrade passband characteristics
Solution Approach 1:
The patent implements different electrode structure pitches in different resonator sections. The first resonator section uses a first pitch, the second resonator section uses a second pitch different from the first, and the third resonator section uses a third pitch. This local variation in pitch eliminates resonance spikes and flattens passband characteristics while remaining compatible with standard manufacturing processes
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 flatter passband characteristics and reduced error rates, enhancing communication performance by mitigating resonance spikes and improving filter performance across the frequency band.
Implementation Method 1
Using a piezoelectric material as a vibrating medium, acoustic resonators operate by transforming an electrical signal wave that is propagating along an electrical conductor into an acoustic wave that is propagating via the piezoelectric material
Implementation Method 2
acoustic resonators operate by transforming an electrical signal wave that is propagating along an electrical conductor into an acoustic wave that is propagating via the piezoelectric material
Implementation Method 3
a resonator including a first section of a shared input busbar, a first section of a shared output busbar, and an electrode structure between the first section of the shared input busbar and the first section of the shared output busbar, the electrode structure configured for a resonance
Implementation Method 4
a detuned resonator including a second section of the shared input busbar, a second section of the shared output busbar, and a detuned electrode structure between the second section of the shared input busbar and the second section of the shared output busbar, the detuned electrode structure configured for a detuned resonance different from the resonance
Data Source
AI summary
Aspects of the disclosure relate to wireless communication, and high-frequency filters with resonators. One example is a frequency band filter circuit having a split resonator. The split resonator comprises a resonator including a first section of a shared input busbar, a first section of a shared output busbar, and an electrode structure between the first section of the shared input busbar and the first section of the shared output busbar, the electrode structure configured for a resonance. The split resonator also comprises a detuned resonator. The detuned resonator includes a second section of the shared input busbar, a second section of the shared output busbar, and a detuned electrode structure between the second section of the shared input busbar and the second section of the shared output busbar, the detuned electrode structure configured for a detuned resonance different from the resonance.