Topology Assessment for Dual-Band Filters Based on Acoustic Wave Resonators

Acosta, Lluis; Guerrero, Eloi; Verdú, Jordi; Paco, Pedro de

doi:10.1109/tmtt.2022.3222327

Cited by 6 publications

(2 citation statements)

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“…The recently developed filter synthesis methodology provides the tools to better understand the interaction between the technological constraints and filter performance [ 9 ]. Taking advantage of the nodal approach, three methods to design dual-band filters with acoustic wave resonators are systematically discussed, and it was found that the conventional ladder topology can accurately control the final response and is compatible with the acoustic wave technology requirements [ 10 ]. K. V. Phani Kumar et al presented a compact dual-band filter based on a signal interference technique, formed by the transmission lines [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…Accordingly, a dual-band SAW filter was fabricated showing center frequencies ( f c ) of 3065 MHz and 4804 MHz, respectively. Such a dual-band filter on a basis of a conventional ladder structure exhibits a compact layout and a small size in contrast to the dual-band filter using the double-ladder approach, making it a strong candidate in the dual-band filtering scheme [ 10 , 28 ]. This work provides a promising approach to constitute a dual-passband SAW filter for 5G application.…”

Section: Introductionmentioning

confidence: 99%

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Dual-Passband SAW Filter Based on a 32°YX-LN/SiO2/SiC Multilayered Substrate

et al. 2023

Micromachines

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To meet the demands of highly integrated and miniaturized radio frequency front-end (RFFE) modules, multi-passband filters which support multi-channel compounding come to the foreground. In this work, we proposed a new design of a dual-passband surface acoustic wave (SAW) filter based on a 32°YX-LiNbO3 (LN)/SiO2/SiC multilayered structure. The filter is of a standalone ladder topology and comprises dual-mode resonators, in which the shear horizontal (SH) mode and high-order SH mode are simultaneously excited through electrode thickness modulation. The impact of electrode thickness on the performance of the dual-mode resonator was systematically investigated by the finite element method (FEM), and resonators were prepared and verified the simulation results. The electromechanical coupling coefficients (K2) of the SH modes are 15.1% and 17.0%, while the maximum Bode-Q (Qmax) values are 150 and 247, respectively, for the fabricated resonators with wavelengths of 1 μm and 1.1 μm. In terms of the high-order SH modes in these resonators, the K2 values are 9.8% and 8.4%, and Qmax values are 190 and 262, respectively. The fabricated dual-band filter shows the center frequencies (fc) of 3065 MHz and 4808 MHz as two bands, with 3-dB fractional bandwidths (FBW) of 5.1% and 5.9%, respectively. Such a dual-band SAW filter based on a conventional ladder topology is meaningful in terms of its compact layout and diminished area occupancy. This work provides a promising avenue to constitute a high-performance dual-passband SAW filter for sub-6 GHz RF application.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%