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Related Concept Videos

Active Filters01:25

Active Filters

880
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
880
Passive Filters01:27

Passive Filters

569
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Related Experiment Video

Updated: Aug 4, 2025

Fabrication of Surface Acoustic Wave Devices on Lithium Niobate
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GaN surface acoustic wave filter with low insertion loss.

Yujie Ai1, Hongrui Lv2, Ye Wang3

  • 1Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.

Ultrasonics
|April 1, 2023
PubMed
Summary

This study demonstrates a low insertion loss (IL) Surface Acoustic Wave (SAW) filter on Gallium Nitride (GaN). Increasing interdigital transducers (N_IDT) significantly reduced IL, enhancing filter performance without external matching.

Keywords:
Bulk GaNFilterInsertion loss (IL)Surface acoustic wave (SAW)Temperature coefficient of frequency (TCF)

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Acoustics

Background:

  • Surface Acoustic Wave (SAW) filters are crucial components in radio frequency (RF) systems.
  • Achieving low insertion loss (IL) in SAW filters is a key challenge for improved device efficiency.
  • Gallium Nitride (GaN) offers promising material properties for high-frequency acoustic devices.

Purpose of the Study:

  • To demonstrate a low IL SAW filter utilizing carbon-doped semi-insulating c-plane bulk GaN.
  • To investigate the influence of interdigital transducer (N_IDT) count and propagation direction on filter performance.
  • To analyze the material properties of GaN relevant to SAW device operation.

Main Methods:

  • Fabrication of SAW filters on carbon-doped semi-insulating c-plane bulk GaN.
  • Characterization of filter performance including center frequency, bandwidth, IL, and return loss.
  • Numerical calculation of elastic stiffness and piezoelectric constants in Euler angle space.

Main Results:

  • A SAW filter with a low IL of 4.415 dB was achieved without external lumped element matching.
  • Insertion loss decreased from 16.07 dB to 4.415 dB as N_IDT increased from 50 to 150.
  • GaN material properties were found to be isotropic on the c-plane, with minor performance variations observed between m- and a-directions.

Conclusions:

  • Carbon-doped semi-insulating c-plane bulk GaN is a viable substrate for high-performance SAW filters.
  • Optimizing N_IDT is critical for reducing IL and enhancing SAW filter efficiency.
  • Understanding material anisotropy and fabrication variations is important for consistent device performance.