Zobrazeno 1 - 10
of 10
pro vyhledávání: '"David W Landgren"'
Autor:
Kenneth Wright, Jason M Amini, Daniel L Faircloth, Curtis Volin, S Charles Doret, Harley Hayden, C-S Pai, David W Landgren, Douglas Denison, Tyler Killian, Richart E Slusher, Alexa W Harter
Publikováno v:
New Journal of Physics, Vol 15, Iss 3, p 033004 (2013)
We report the design, fabrication and characterization of a microfabricated surface-electrode ion trap that supports controlled transport through the two-dimensional intersection of linear trapping zones arranged in a 90° cross. The trap is fabricat
Externí odkaz:
https://doaj.org/article/9c09aea494564e11b6413bad3a43ba83
Autor:
Jonathan Perez, Theresa Brunasso, David W. Landgren, James B. Dee, Joshua M. Kovitz, G. Smith, Jeramy M. Marsh, Kenneth W. Allen, Daniel J.P. Dykes, Charles P. Hunter
Publikováno v:
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting.
A fully combined, fixed-beam, ultra-wideband array with unbalanced feeds is described. Both the array elements and power combiners are based on the fragmented aperture principle. Each was designed separately using a genetic algorithm, then combined t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ad30a1f4cb00140cf818ea400ae787e
https://doi.org/10.1109/apusncursinrsm.2019.8888550
https://doi.org/10.1109/apusncursinrsm.2019.8888550
Autor:
David W. Landgren, Charles P. Hunter, Kenneth W. Allen, Jonathan Perez, Jeramy M. Marsh, J P Dykes Daniel, Theresa Brunasso, James B. Dee
Publikováno v:
NAECON 2018 - IEEE National Aerospace and Electronics Conference.
In this work, a novel fragmented combiner network is designed to excite a planar phased array antenna, comprised of 4x4 elements with a single RF port (i.e. 16:1). The antenna system, intended for receive (Rs) applications, was engineered with ultra-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::57f9ff11ce5e0373c9f3ef76aa2205f3
https://doi.org/10.1109/naecon.2018.8556798
https://doi.org/10.1109/naecon.2018.8556798
Autor:
R. Todd Lee, Daniel J.P. Dykes, Jeffrey A. Bean, Douglas R. Denison, David R. Reid, Kenneth W. Allen, David W. Landgren
Publikováno v:
2017 IEEE National Aerospace and Electronics Conference (NAECON).
Metasurfaces enable a new avenue to engineered responses of the electromagnetic scattering characteristics through the control and manipulation of the wavefronts. The wavefronts are tuned by altering deeply sub-wavelength structural features on the m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e5226870c0bec6ee3945c910f79b75c4
https://doi.org/10.1109/naecon.2017.8268764
https://doi.org/10.1109/naecon.2017.8268764
Publikováno v:
2017 IEEE National Aerospace and Electronics Conference (NAECON).
In this work, a simulation study of a meta- surface antenna demonstrates a recon gurable con- ductive topology that alters the radiation characteris- tics of the antenna. Surrogate resistance, inductance, and capacitance values are used to model the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8fdc0fdd1f9d369ef2fe1dbd2dab7262
https://doi.org/10.1109/naecon.2017.8293874
https://doi.org/10.1109/naecon.2017.8293874
Autor:
Daniel J.P. Dykes, Phillip R. Bowden, Jonathan Perez, Kenneth W. Allen, Kevin Cook, David W. Landgren
Publikováno v:
2017 IEEE National Aerospace and Electronics Conference (NAECON).
In this article an ultra-wideband (UWB), millimeter wave (mmWave) fragmented antenna with a single feed point is presented. The conductor region of the antenna aperture is approximately 0.5 mm by 2.0 mm or 0.07 λ × 0.25 λ at the shortest wavelengt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f016718e36871b0111836a26f9a9ced0
https://doi.org/10.1109/naecon.2017.8268771
https://doi.org/10.1109/naecon.2017.8268771
Autor:
Brent K. Wagner, David W. Landgren, Stuart Hughes, Chris Ward, Andrew Stark, Matthew King, Don Swank, Andreas Beling, Hunter Chan, Joe C. Campbell, Kevin Cook
Publikováno v:
2015 IEEE Avionics and Vehicle Fiber-Optics and Photonics Conference (AVFOP).
Demonstration of low conversion loss through the novel integration and packaging of high power photodiodes and a fragmented aperture antenna for a fiber-fed RF array.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b43a2403c337ba0b0b2aed295188d1e
https://doi.org/10.1109/avfop.2015.7356642
https://doi.org/10.1109/avfop.2015.7356642
Autor:
Brent K. Wagner, Kevin Cook, Joe C. Campbell, David W. Landgren, Chris Ward, Matthew King, Stuart Hughes, Andrew Stark, Hunter Chan, Don Swank, Andreas Beling
Publikováno v:
2015 IEEE Photonics Conference (IPC).
Integration of UVA-developed high power photodiodes into a novel RF package co-designed with a wide-bandwidth, fragmented aperture antenna for fiber-fed, array antenna applications.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::09cc0a898242b8de6abf9158df1aa312
https://doi.org/10.1109/ipcon.2015.7323691
https://doi.org/10.1109/ipcon.2015.7323691
Autor:
David W. Landgren, Curtis Volin, C. S. Pai, J.M. Amini, Harley Hayden, Kenneth Wright, Tyler Killian, Richart E. Slusher, Daniel L. Faircloth, Douglas R. Denison, Alexa W. Harter, S. Charles Doret
We report the design, fabrication, and characterization of a microfabricated surface-electrode ion trap that supports controlled transport through the two-dimensional intersection of linear trapping zones arranged in a ninety-degree cross. The trap i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::680b14076f8b98a93500465d95910070
http://arxiv.org/abs/1210.3655
http://arxiv.org/abs/1210.3655
Publikováno v:
2011 IEEE International Symposium on Antennas and Propagation (APSURSI).
In the simplest formulation, the FDTD algorithm requires that objects follow the rectangular grid. For curved surfaces, this is a severe limitation. In this paper, an approach to modify an existing rectangular FDTD code to model structures more natur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ec671423b7ca52f3242cf1a70ecec21
https://doi.org/10.1109/aps.2011.5996985
https://doi.org/10.1109/aps.2011.5996985