Jack J. Kramer
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View article: Practical Demonstrations of FR3-Band Thin-Film Lithium Niobate Acoustic Filter Design
Practical Demonstrations of FR3-Band Thin-Film Lithium Niobate Acoustic Filter Design Open
This article presents an approach to control the operating frequency and fractional bandwidth (FBW) of miniature acoustic filters in thin-film lithium niobate (TFLN). More specifically, we used first-order antisymmetric (A1) mode lateral-f…
View article: An 11.7-GHz ScAlN FBAR Filter: Case Study on Scaling Limits and Challenges
An 11.7-GHz ScAlN FBAR Filter: Case Study on Scaling Limits and Challenges Open
This paper reports an 11.7 GHz compact 50 ohm ladder filter based on single layer Scandium Aluminum Nitride (ScAlN) film bulk acoustic resonators (FBARs) with platinum (Pt) electrodes, and uses it as a quantitative case study of the limits…
View article: Ku-Band Alscn-on-Diamond SAW Resonators with Phase Velocity Above 8600 M/S
Ku-Band Alscn-on-Diamond SAW Resonators with Phase Velocity Above 8600 M/S Open
In this work, an Aluminum Scandium Nitride (AlScN) on Diamond Sezawa-mode surface acoustic wave (SAW) platform for RF filtering at Ku-band (12-18 GHz) is demonstrated. Thanks to the high acoustic velocity and low-loss diamond substrate, th…
View article: 50 GHz Piezoelectric Acoustic Filter
50 GHz Piezoelectric Acoustic Filter Open
This paper presents significant frequency scaling of acoustic filter technology to 50 GHz. This achievement is enabled by the P3F LiNbO3 multilayer stack, in which piezoelectric thin-films of alternating orientations are transferred in seq…
View article: Applying the Health Stigma and Discrimination Framework to psychosis stigma in Malawi
Applying the Health Stigma and Discrimination Framework to psychosis stigma in Malawi Open
Psychotic disorders are highly stigmatized across the globe, negatively impacting people with psychosis and their families. However, little is known about stigma faced by people with psychosis in sub-Saharan Africa. We developed semi-struc…
View article: Applying the Health Stigma and Discrimination Framework to psychosis stigma in Malawi
Applying the Health Stigma and Discrimination Framework to psychosis stigma in Malawi Open
Psychotic disorders are highly stigmatized across the globe, negatively impacting people with psychosis and their families. However, little is known about stigma faced by people with psychosis in sub-Saharan Africa. We developed semi-struc…
View article: Friendship Bench intervention to address depression and improve HIV care engagement among adolescents living with HIV in Malawi: Study protocol for a pilot randomized controlled trial
Friendship Bench intervention to address depression and improve HIV care engagement among adolescents living with HIV in Malawi: Study protocol for a pilot randomized controlled trial Open
Background Adolescents in Sub-Saharan Africa are disproportionately affected by the HIV epidemic. Comorbid depression is prevalent among adolescents living with HIV (ALWH) and poses numerous challenges to HIV care engagement and retainment…
View article: Friendship Bench Intervention to Address Depression and Improve HIV Care Engagement Among Adolescents Living with HIV in Malawi: Study Protocol for a Pilot Randomized Controlled Trial
Friendship Bench Intervention to Address Depression and Improve HIV Care Engagement Among Adolescents Living with HIV in Malawi: Study Protocol for a Pilot Randomized Controlled Trial Open
Background Adolescents in Sub-Saharan Africa are disproportionately affected by the HIV epidemic. Comorbid depression is prevalent among adolescents living with HIV (ALWH) and poses numerous challenges to HIV care engagement and retainment…
View article: Stigma and Discrimination Faced by Adolescents Living with HIV and Experiencing Depression in Malawi
Stigma and Discrimination Faced by Adolescents Living with HIV and Experiencing Depression in Malawi Open
Background In Malawi, approximately 25% of adolescents living with HIV (ALWH) also suffer from depression. Not only is HIV stigma a major contributor to depression, but it also adversely impacts HIV care engagement. ALWH can experience HIV…
View article: Millimeter Wave Thin-Film Bulk Acoustic Resonator in Sputtered Scandium Aluminum Nitride Using Platinum Electrodes
Millimeter Wave Thin-Film Bulk Acoustic Resonator in Sputtered Scandium Aluminum Nitride Using Platinum Electrodes Open
This work describes sputtered scandium aluminum nitride (ScAlN) thin-film bulk acoustic resonators (FBAR) at millimeter wave (mmWave) with high quality factor (Q) using platinum (Pt) electrodes. FBARs with combinations of Pt and aluminum (…
View article: Transferred Thin Film Lithium Niobate as Millimeter Wave Acoustic Filter Platforms
Transferred Thin Film Lithium Niobate as Millimeter Wave Acoustic Filter Platforms Open
This paper reports the first high-performance acoustic filters toward millimeter wave (mmWave) bands using transferred single-crystal thin film lithium niobate (LiNbO3). By transferring LiNbO3 on the top of silicon (Si) and sapphire (Al2O3…
View article: Nanoscale Imaging of Super-High-Frequency Microelectromechanical Resonators with Femtometer Sensitivity
Nanoscale Imaging of Super-High-Frequency Microelectromechanical Resonators with Femtometer Sensitivity Open
Implementing microelectromechanical system (MEMS) resonators calls for detailed microscopic understanding of the devices, such as energy dissipation channels, spurious modes, and imperfections from microfabrication. Here, we report the nan…