Bulk Acoustic Wave Resonator Edge Structure for 5G Leakage Control
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Solution Overview
Problem
In the context of 5G communications, bulk-acoustic wave resonators face challenges with increased energy leakage due to higher frequencies and bandwidth, leading to signal strength reduction and increased loss in the piezoelectric layer or resonator.
Innovation Solution
The design incorporates a bulk-acoustic wave resonator with a central portion and an extension portion, featuring a first electrode, a piezoelectric layer, and a second electrode stacked on a substrate, along with an insertion layer that raises the piezoelectric layer, and includes inclined surfaces and reflective interfaces to minimize energy leakage. This configuration includes a membrane layer, cavity, and cap with via holes and connection conductors for electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frequency is increased for 5G communications, then the bandwidth is increased, but the energy leakage in the resonator is increased
Solution Approach 1:
The resonator is divided into a central portion and an extension portion, with the insertion layer selectively positioned in the extension portion to segment the acoustic path and reduce energy leakage at the periphery
Solution Approach 2:
The insertion layer acts as an intermediary structure between the piezoelectric layer and the substrate, providing acoustic impedance matching and reducing energy leakage through the inclined surface configuration
2Speed
If the frequency is increased for 5G communications, then the bandwidth is increased, but the signal strength is reduced
Solution Approach 1:
The resonator structure is segmented into central and extension portions, with the insertion layer in the extension portion reducing energy leakage and preserving signal strength at high frequencies
Solution Approach 2:
The insertion layer changes the acoustic impedance parameters in the extension portion, optimizing energy confinement and maintaining signal strength across the 5G frequency band
3Speed
If the frequency is increased for 5G communications, then the bandwidth is increased, but the loss in the piezoelectric layer is increased
Solution Approach 1:
The piezoelectric layer's acoustic path is segmented by the insertion layer in the extension portion, reducing energy leakage and loss at high frequencies
Solution Approach 2:
The insertion layer serves as an intermediary that reduces acoustic energy loss in the piezoelectric layer by providing impedance matching and reducing leakage at the resonator periphery
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 effectively reduces energy leakage by enhancing the resonator's performance through additional reflective interfaces and structural support, improving signal strength and reducing losses, particularly suitable for 5G communication frequencies.
Implementation Method 1
a bulk-acoustic wave (BAW) type filter using a semiconductor thin film wafer manufacturing technology may be used... depositing a piezoelectric dielectric material on a silicon wafer, a semiconductor substrate, and using the piezoelectric characteristics thereof
Implementation Method 2
an insertion layer disposed below the piezoelectric layer in the extension portion to raise the piezoelectric layer. The insertion layer has a first inclined surface formed along a side surface facing the central portion
Data Source
AI summary
A bulk-acoustic wave resonator includes: a resonator comprising a central portion in which a first electrode, a piezoelectric layer, and a second electrode are sequentially stacked on a substrate, and an extension portion disposed along a periphery of the central portion; and an insertion layer disposed below the piezoelectric layer in the extension portion to raise the piezoelectric layer. The insertion layer may have a first inclined surface formed along a side surface facing the central portion, and the first electrode may have a second inclined surface extending from a lower end of the first inclined surface of the insertion layer.