Microwave Acoustic Devices: Recent Advances and Outlook

Gong, Songbin; Lu, Ruochen; Yang, Yansong; Gao, Liuqing; Hassanien, Ahmed E.

doi:10.1109/jmw.2021.3064825

Cited by 86 publications

(23 citation statements)

References 94 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Acoustic wave propagation in common RF materials has orders of magnitude smaller wavelength and lower loss compared to those in their electromagnetic counterparts [21]. Due to these fundamental advantages, acoustic filters have low loss, high selectivity, and compact form factors, resulting in their pervasiveness in modern commodity mobile devices.…”

Section: A Rf Acoustic Filtersmentioning

confidence: 99%

“…A high-frequency acoustic filter often consists of several BAW resonators, while surface-acoustic wave (SAW) resonators are typically deployed for low-frequency (e.g., below 2 GHz) applications [18], [22]. Given that the fractional BWs of acoustic filters are fundamentally limited by the efficiency of their electromechanical transduction [21], [22], we focus on BAW filters in this article as their high-frequency operation results in wide instantaneous BWs.…”

Section: A Rf Acoustic Filtersmentioning

confidence: 99%

See 1 more Smart Citation

A Passive-Mixer-First Acoustic-Filtering Chipset Using Mixed-Domain Recombination

Seo

Sha

Zhou

2022

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

A mixer-first acoustic-filtering high-intermediatefrequency (IF) superheterodyne radio frequency (RF) front end is presented, which utilizes a mixed-domain recombination architecture. By having a set of commutated switches or essentially a passive mixer before fixed-frequency acoustic filters, mixer-first acoustic filtering enables a widely tunable RF for the front end while preserving the acoustic filter's high-order filtering response and high linearity. Compared to the prior work that uses IF-only recombination, the proposed IF-and-baseband mixed-domain recombination supports a wider instantaneous bandwidth (BW) and higher RF while reducing the number of IF passive components that are lossy and bulky. A proofof-concept chipset is demonstrated; it consists of an RF frontend N-path commutated-LC passive mixer and an IF in-phase and quadrature (I-Q)-mismatch-compensating complex receiver in 65-nm CMOS as well as two 2.6-GHz Qorvo QPQ1285 bulkacoustic wave (BAW) filters. In measurement, the chipset operates across 3.5-6.5 GHz RF with a 160-MHz instantaneous BW, 10-dB noise figure (NF) at 3.5-GHz RF, and an out-of-band IIP3 of +27 dBm at 1 × BW offset.

show abstract

Section: A Rf Acoustic Filtersmentioning

confidence: 99%

Section: A Rf Acoustic Filtersmentioning

confidence: 99%

A Passive-Mixer-First Acoustic-Filtering Chipset Using Mixed-Domain Recombination

Seo

Sha

Zhou

2022

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…Surface acoustic wave (SAW) filters exhibit excellent frequency band selectivity and are small, serving as an irreplaceable component in the front-end radio frequencies (RF) required for modern communication [ 1 , 2 , 3 , 4 , 5 ]. To fulfill the explosive growth of data transmission demands and ubiquitous wireless connectivity in 5G communications, significantly wider bandwidths (BW) are required for 5G compared to previous generations of communication technologies [ 6 , 7 , 8 , 9 ]. For example, the filters for new 5G bands can currently deliver a fractional bandwidth (FBW) of more than 13% (compared to 3–5% for 4G) [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Fractional Bandwidth up to 24% and Spurious Free SAW Filters on Bulk 15°YX-LiNbO3 Substrates Using Thickness-Modulated IDT Structures

et al. 2022

Micromachines

View full text Add to dashboard Cite

To cope with ubiquitous wireless connectivity and the increased and faster data delivery in 5G communication, surface acoustic wave (SAW) filters are progressively requiring wider bandwidths. Conventional bulk 15°YX-LiNbO3 substrates with a large coupling coefficient (K2) are attractive for the low-cost mass production of wideband SAW filters, but these generally suffer from spurious responses, limiting their practical application. In this work, a novel and simple SAW configuration is proposed that uses thickness-modulated interdigital transducer (IDT) structures to overcome the limitations set by spurious responses. Different from the conventional design where the thicknesses of the IDT electrodes in the series and parallel resonators generally kept the same, the proposed configuration adopts IDT electrodes of different thicknesses in the series and shunt resonators to suppress or remove unwanted spurious Rayleigh modes from the filter passband. Two different ultra-wideband SAW filter designs employing thickness-modulated IDTs were designed and fabricated to validate the effective suppression of spurious modes. The SAW filters experimentally featured spurious-free responses in the passband as well as a large 3 dB fractional bandwidth (FBW) in the 18.0% and 24.1% ranges and low insertion losses below 1 dB. This work can significantly broaden the range of applications for SAW devices and can open a pathway to commercialize ultra-wideband SAW filters in 5G communication systems.

show abstract

“…A COUSTIC devices operating beyond GHz have been extensively studied in the past few years [1], [2]. The development is fueled by the endeavor to scale acoustic signal processing elements (e.g., piezoelectric resonator-based filters) into 5G frequency bands [3].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Loss of GHz Higher-Order Lamb Waves in Thin-Film Lithium Niobate: A Comparative Study

Yang

Gong

2021

J. Microelectromech. Syst.

Self Cite

View full text Add to dashboard Cite

This work reports a comparative study of acoustic loss between different Lamb waves at GHz in thin-film lithium niobate (LiNbO 3 ). The propagation loss (PL) of higher-order Lamb waves in thin-film LiNbO 3 is studied for the first time using acoustic delay line (ADL) testbeds. The acoustic wave attenuation and quality factors ( Q) of different Lamb waves are extracted, showing higher Qs for higher-order Lamb modes than fundamental modes in air and vacuum at room temperature. The extracted Qs are higher than those reported in thin-film LiNbO 3 resonators, implying the electrode and anchor-induced loss as the dominant loss factors. The ADL-based loss analysis framework is readily extendable to acoustic damping study in other microwave acoustic platforms.

show abstract

Microwave Acoustic Devices: Recent Advances and Outlook

Cited by 86 publications

References 94 publications

A Passive-Mixer-First Acoustic-Filtering Chipset Using Mixed-Domain Recombination

A Passive-Mixer-First Acoustic-Filtering Chipset Using Mixed-Domain Recombination

Fractional Bandwidth up to 24% and Spurious Free SAW Filters on Bulk 15°YX-LiNbO3 Substrates Using Thickness-Modulated IDT Structures

Acoustic Loss of GHz Higher-Order Lamb Waves in Thin-Film Lithium Niobate: A Comparative Study

Contact Info

Product

Resources

About