BAW Filter Module Layout for Higher RF Power Ruggedness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bulk acoustic wave (BAW) resonators in RF filters face power limitations due to limited thermal dissipation, leading to potential damage and inefficiencies, especially at high frequencies like those used in 5G communications.
Innovation Solution
Implementing a filter module with resonator frequency shifted out of the target band and utilizing dual-quad or octane resonator configurations to reduce power consumption and enhance thermal management, thereby improving power ruggedness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional BAW resonators are used in RF filters, then the filter can operate at high frequencies, but the thermal dissipation is limited causing power damage and reduced reliability
Solution Approach 1:
The resonator is divided into multiple separate resonator elements (first resonator, second resonator, third resonator, fourth resonator) that are coupled together. This segmentation distributes the power handling across multiple elements, improving thermal dissipation and power ruggedness while maintaining the required filtering function at high frequencies
Solution Approach 2:
The resonator elements are arranged in a nested configuration where they are coupled through shared electrodes and structures. The first and second resonators share a first electrode, while the third and fourth resonators share a second electrode, creating a compact nested arrangement that improves thermal management
2Loss of energy
If the resonator frequency is at the target frequency, then the filter operates efficiently, but power consumption increases and thermal management becomes difficult
Solution Approach 1:
The resonators are designed with different resonant frequencies (first resonator frequency, second resonator frequency, third resonator frequency, fourth resonator frequency) that are strategically selected to avoid the target communication frequency band. This parameter change reduces power consumption and thermal generation while the coupling mechanism maintains the required filtering performance
3Power
If single resonator configuration is used, then the device complexity is low, but the power handling capability and thermal management are insufficient
Solution Approach 1:
Multiple resonator elements are merged into a single integrated resonator structure with shared electrodes and coupled configurations. The first resonator couples to the second resonator, and the third resonator couples to the fourth resonator, creating a unified power handling system that improves maximum power endurance while maintaining manageable complexity
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
Significantly reduces power consumption and increases the maximum power the filter module can endure, enhancing thermal stability and reducing harmonics and inter-modulation distortion.
Implementation Method 1
The filter includes a plurality of bulk acoustic wave resonators
Implementation Method 2
bulk acoustic wave (BAW) resonators in RF filters face power limitations due to limited thermal dissipation
Data Source
AI summary
A filter module has a first terminal, a second terminal, and at least one filter disposed along each signal path extending from the first terminal to the second terminal. The filter can include a plurality of series resonators and a plurality of shunt resonators disposed between the series resonators and a ground configured to enhance power ruggedness of the filter module. A matching circuit coupled to the filter performs impedance matching of the filter.