Low-loss and wideband acoustic delay lines

Tomas Manzaneque, Ruochen Lu, Yansong Yang, Songbin Gong

Research output: Contribution to journalArticle

Abstract

This paper demonstrates low-loss acoustic delay lines (ADLs) based on shear-horizontal waves in thin-film LiNbO3 for the first time. Due to its high electromechanical coupling, the shear-horizontal mode is suited for producing devices with large bandwidths. Here, we show that shear-horizontal waves in LiNbO3 thin films are also excellent for implementing low-loss ADLs based on unidirectional transducers. The high acoustic reflections and large transducer unidirectionality induced by the mechanical loading of the electrodes on a LiNbO3 thin film provide a great tradeoff between delay line insertion loss and bandwidth. The directionality for two different types of unidirectional transducers has been characterized. Delay lines with variations in the key design parameters have been designed, fabricated, and measured. One of our fabricated devices has shown a group delay of 75 ns with an IL below 2 dB over a 3-dB bandwidth of 16 MHz centered at 160 MHz (fractional bandwidth = 10%). The measured insertion loss for other devices with longer delays and different numbers of transducer cells are analyzed, and the loss contributing factors and their possible mitigation are discussed.

Original languageEnglish (US)
Article number8671488
Pages (from-to)1379-1391
Number of pages13
JournalIEEE Transactions on Microwave Theory and Techniques
Volume67
Issue number4
DOIs
StatePublished - Apr 2019

Fingerprint

Acoustic delay lines
acoustic delay lines
Transducers
transducers
broadband
bandwidth
Bandwidth
Electric delay lines
delay lines
shear
Insertion losses
insertion loss
Thin films
thin films
Electromechanical coupling
Group delay
tradeoffs
Acoustics
Electrodes
electrodes

Keywords

  • Acoustic devices
  • delay lines
  • lithium niobate (LiNbO3)
  • microelectromechanical systems
  • piezoelectric transducers
  • transversal filters

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Low-loss and wideband acoustic delay lines. / Manzaneque, Tomas; Lu, Ruochen; Yang, Yansong; Gong, Songbin.

In: IEEE Transactions on Microwave Theory and Techniques, Vol. 67, No. 4, 8671488, 04.2019, p. 1379-1391.

Research output: Contribution to journalArticle

Manzaneque, Tomas ; Lu, Ruochen ; Yang, Yansong ; Gong, Songbin. / Low-loss and wideband acoustic delay lines. In: IEEE Transactions on Microwave Theory and Techniques. 2019 ; Vol. 67, No. 4. pp. 1379-1391.
@article{aab5586faa314650b16989db69c66f5e,
title = "Low-loss and wideband acoustic delay lines",
abstract = "This paper demonstrates low-loss acoustic delay lines (ADLs) based on shear-horizontal waves in thin-film LiNbO3 for the first time. Due to its high electromechanical coupling, the shear-horizontal mode is suited for producing devices with large bandwidths. Here, we show that shear-horizontal waves in LiNbO3 thin films are also excellent for implementing low-loss ADLs based on unidirectional transducers. The high acoustic reflections and large transducer unidirectionality induced by the mechanical loading of the electrodes on a LiNbO3 thin film provide a great tradeoff between delay line insertion loss and bandwidth. The directionality for two different types of unidirectional transducers has been characterized. Delay lines with variations in the key design parameters have been designed, fabricated, and measured. One of our fabricated devices has shown a group delay of 75 ns with an IL below 2 dB over a 3-dB bandwidth of 16 MHz centered at 160 MHz (fractional bandwidth = 10{\%}). The measured insertion loss for other devices with longer delays and different numbers of transducer cells are analyzed, and the loss contributing factors and their possible mitigation are discussed.",
keywords = "Acoustic devices, delay lines, lithium niobate (LiNbO3), microelectromechanical systems, piezoelectric transducers, transversal filters",
author = "Tomas Manzaneque and Ruochen Lu and Yansong Yang and Songbin Gong",
year = "2019",
month = "4",
doi = "10.1109/TMTT.2019.2900246",
language = "English (US)",
volume = "67",
pages = "1379--1391",
journal = "IEEE Transactions on Microwave Theory and Techniques",
issn = "0018-9480",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4",

}

TY - JOUR

T1 - Low-loss and wideband acoustic delay lines

AU - Manzaneque, Tomas

AU - Lu, Ruochen

AU - Yang, Yansong

AU - Gong, Songbin

PY - 2019/4

Y1 - 2019/4

N2 - This paper demonstrates low-loss acoustic delay lines (ADLs) based on shear-horizontal waves in thin-film LiNbO3 for the first time. Due to its high electromechanical coupling, the shear-horizontal mode is suited for producing devices with large bandwidths. Here, we show that shear-horizontal waves in LiNbO3 thin films are also excellent for implementing low-loss ADLs based on unidirectional transducers. The high acoustic reflections and large transducer unidirectionality induced by the mechanical loading of the electrodes on a LiNbO3 thin film provide a great tradeoff between delay line insertion loss and bandwidth. The directionality for two different types of unidirectional transducers has been characterized. Delay lines with variations in the key design parameters have been designed, fabricated, and measured. One of our fabricated devices has shown a group delay of 75 ns with an IL below 2 dB over a 3-dB bandwidth of 16 MHz centered at 160 MHz (fractional bandwidth = 10%). The measured insertion loss for other devices with longer delays and different numbers of transducer cells are analyzed, and the loss contributing factors and their possible mitigation are discussed.

AB - This paper demonstrates low-loss acoustic delay lines (ADLs) based on shear-horizontal waves in thin-film LiNbO3 for the first time. Due to its high electromechanical coupling, the shear-horizontal mode is suited for producing devices with large bandwidths. Here, we show that shear-horizontal waves in LiNbO3 thin films are also excellent for implementing low-loss ADLs based on unidirectional transducers. The high acoustic reflections and large transducer unidirectionality induced by the mechanical loading of the electrodes on a LiNbO3 thin film provide a great tradeoff between delay line insertion loss and bandwidth. The directionality for two different types of unidirectional transducers has been characterized. Delay lines with variations in the key design parameters have been designed, fabricated, and measured. One of our fabricated devices has shown a group delay of 75 ns with an IL below 2 dB over a 3-dB bandwidth of 16 MHz centered at 160 MHz (fractional bandwidth = 10%). The measured insertion loss for other devices with longer delays and different numbers of transducer cells are analyzed, and the loss contributing factors and their possible mitigation are discussed.

KW - Acoustic devices

KW - delay lines

KW - lithium niobate (LiNbO3)

KW - microelectromechanical systems

KW - piezoelectric transducers

KW - transversal filters

UR - http://www.scopus.com/inward/record.url?scp=85064071804&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85064071804&partnerID=8YFLogxK

U2 - 10.1109/TMTT.2019.2900246

DO - 10.1109/TMTT.2019.2900246

M3 - Article

AN - SCOPUS:85064071804

VL - 67

SP - 1379

EP - 1391

JO - IEEE Transactions on Microwave Theory and Techniques

JF - IEEE Transactions on Microwave Theory and Techniques

SN - 0018-9480

IS - 4

M1 - 8671488

ER -