Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Walter S. Wall"'
Publikováno v:
2020 IEEE International Ultrasonics Symposium (IUS).
We report on observing significant reduction of injected phase noise (more than 20 dB over two decades with a peak reduction of 29 dB) on particular comb teeth in high-Q, phononic frequency combs in AT-cut 100-MHz shear-mode quartz resonators. A freq
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dfb126c9f1554b83b6b2898d18a0c0ae
https://doi.org/10.1109/ius46767.2020.9251410
https://doi.org/10.1109/ius46767.2020.9251410
Publikováno v:
2020 Joint Conference of the IEEE International Frequency Control Symposium and International Symposium on Applications of Ferroelectrics (IFCS-ISAF).
We report on a nonlinear analysis of high-fidelity, high-Q, phononic frequency combs in AT-cut 100-MHz shear-mode quartz resonators. The comb generation was observed on anharmonic modes above the fundamental mode resonance. These modes exhibited the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a7f021bf6e2b6e434fe3b8a3cfe1aad0
https://doi.org/10.1109/ifcs-isaf41089.2020.9234949
https://doi.org/10.1109/ifcs-isaf41089.2020.9234949
Publikováno v:
Applied Physics Letters. 116:053501
We report on the observation of high-fidelity, high-Q, phononic combs in AT-cut 100-MHz shear-mode quartz resonators. The comb generation was observed on the first spurious mode above the fundamental mode resonance when driven a few kHz off resonance
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1d0256b0381cdc37af413da3ad7ade33
https://doi.org/10.1063/1.5128930
https://doi.org/10.1063/1.5128930
Publikováno v:
2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting.
In this paper, we describe how electromechanical resonators such as BAW and SAW devices can be used to load FSS unit cells in order to greatly narrow the bandwidth of the resulting FSS. Unlike traditional FSS structures, this new design utilizes high
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::844b358f98114c0673bd57c47437e1ee
https://doi.org/10.1109/apusncursinrsm.2017.8072470
https://doi.org/10.1109/apusncursinrsm.2017.8072470
Publikováno v:
IEEE Antennas and Wireless Propagation Letters. 13:427-430
In this letter, we present a nonlinear metamaterial capable of transitioning between a broadband reflective and broadband nonreflective state depending on the incident power level. Below the activation voltage, broadband reflectivity is created by fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::59a5f296f7bcbd7c4ef736783b365afa
https://doi.org/10.1109/lawp.2014.2308989
https://doi.org/10.1109/lawp.2014.2308989
Publikováno v:
IEEE Antennas and Wireless Propagation Letters. 13:794-797
In this letter, we present a new approach to beam-steering of short, ultrawideband (UWB) pulses using a single-feed radiating structure. Utilizing a radiator consisting of small apertures backed by a reverberating cavity, a time-reversal technique is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dade34b4730343aca9097ca5bf04bfd7
https://doi.org/10.1109/lawp.2014.2318673
https://doi.org/10.1109/lawp.2014.2318673
Autor:
Sun K. Hong, Walter S. Wall
Publikováno v:
IEEE Antennas and Wireless Propagation Letters. 13:1337-1340
In this letter, a self-biasing switch is proposed to reduce the artifacts associated with time-reversal-based beamforming. This device consists of multiple diodes placed in series on a 50- Ω microstrip. At low incident voltages, this device behaves
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ca722891e6c735cdb47e2b716b8dd6ce
https://doi.org/10.1109/lawp.2014.2337015
https://doi.org/10.1109/lawp.2014.2337015
Autor:
David W. Shahan, Zhi Jackie Yao, Joseph D. Schneider, Sidhant Tiwari, Skyler Selvin, John Domann, Yuanxun Ethan Wang, Geoff McKnight, Gregory P. Carman, Rob N. Candler, Paymon Shirazi, Walter S. Wall, Casey J. Sennott, Mohanchandra K. Panduranga
Publikováno v:
Journal of Applied Physics. 126:224104
This paper experimentally demonstrates the operating principles of a near-field multiferroic antenna. The antenna uses a piezoelectric lead-zirconate-titanate stack to apply a time varying strain to a magnetoelastic iron gallium Fe80.77Ga19.23 (FeGa)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf27b3cc97d580f8cb8235c20e334989
https://doi.org/10.1063/1.5126047
https://doi.org/10.1063/1.5126047
Publikováno v:
2015 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium).
Microwave pulse compression is a technique for converting a long-duration, lower amplitude pulse into a short, higher power pulse. The benefit of pulse compression is that it allows for significantly higher peak power to be generated from existing so
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9c274882bef803bdf00e52b89facbee7
https://doi.org/10.1109/usnc-ursi.2015.7303519
https://doi.org/10.1109/usnc-ursi.2015.7303519
Autor:
Walter S. Wall, Scott M. Rudolph
Publikováno v:
2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting.
In this paper, we present a nonlinear multiconductor transmission line model to analyze the time-domain and nonlinear responses of broadband switching metamaterials. This analysis employs coupled transmission lines loaded with nonlinear elements to m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7a5ac2263577019021422fda2248242a
https://doi.org/10.1109/aps.2015.7304423
https://doi.org/10.1109/aps.2015.7304423