Publication

Tri-layered XBAR with SiO2 middle layer

2025

Abstract

XBARs enable the design of low-loss 5 GHz filters that meet the n79 Specification. Meanwhile, the device is fragile, and designers fight to achieve the desired power-handling levels. The temperature shifts of lithium niobate are high. Recently proposed periodically poled structures enhance device robustness and increase the relative passband width; however, they also inherit other drawbacks mentioned. Here, we propose a tri-layered XBAR structure with SiO2 as the middle layer, which is robust, has significantly better TCF, and is supposed to improve power handling capability radically.

Official source

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2025

Abstract

Official source

Related concepts (15)

Band-pass filter

A band-pass filter or bandpass filter (BPF) is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range. In electronics and signal processing, a filter is usually a two-port circuit or device which removes frequency components of a signal (an alternating voltage or current). A band-pass filter allows through components in a specified band of frequencies, called its passband but blocks components with frequencies above or below this band.

Filter (signal processing)

In signal processing, a filter is a device or process that removes some unwanted components or features from a signal. Filtering is a class of signal processing, the defining feature of filters being the complete or partial suppression of some aspect of the signal. Most often, this means removing some frequencies or frequency bands. However, filters do not exclusively act in the frequency domain; especially in the field of many other targets for filtering exist.

Mechanical filter

A mechanical filter is a signal processing filter usually used in place of an electronic filter at radio frequencies. Its purpose is the same as that of a normal electronic filter: to pass a range of signal frequencies, but to block others. The filter acts on mechanical vibrations which are the analogue of the electrical signal. At the input and output of the filter, transducers convert the electrical signal into, and then back from, these mechanical vibrations.