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Analysis of a u-slot patch using characteristic mode analysis and coupled mode theory

2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, APSURSI 2019 - Proceedings

Borchardt, John J.; Lapointe, Tyler C.

Patch antennas incorporating a U-shaped slot are well-known to have relatively large (about 30%) impedance bandwidths. This paper uses Characteristic Mode Analysis to show a classic U-slot patch geometry supports in-phase and anti-phase coupled modes that occur within Coupled Mode Theory.

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TYPE Conference Poster YEAR 2019
DOIOSTIScopus

Sinuous antenna design for UWB radar

2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, APSURSI 2019 - Proceedings

Crocker, Dylan A.; Scott, Waymond R.

Sinuous antennas are capable of producing ultra-wideband radiation with polarization diversity. This capability makes the sinuous antenna an attractive candidate for UWB polarimetric radar applications. Additionally, the ability of the sinuous antenna to be implemented as a planar structure makes it a good fit for close in sensing applications such as ground penetrating radar. However, recent literature has shown the sinuous antenna to suffer from resonances which degrade performance. Such resonances produce late time ringing which is particularly troubling for pulsed close in sensing applications. The resonances occur in two forms: log-periodic resonances on the arms, and a resonance due to the sharp ends left by the outer truncation. A detailed investigation as to the correlation between the log-periodic resonances and the sinuous antenna design parameters indicates the resonances may be mitigated by selecting appropriate design parameters. In addition, a novel truncation method is proposed to remove the sharp end resonance.

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TYPE Conference Poster YEAR 2019
DOIOSTIScopus

Z Line-VISAR: A Spatially Resolved Load Current Diagnostic at the Z Pulsed Power Facility

Bliss, David E.; Myers, Clayton E.; Jones, Michael J.; Baker, J.L.; Austin, Kevin N.; Bettnecourt, R.; Bliss, E.; Celeste, J.; Celliers, P.M.; Clancy, T.; Cohen, S.; Crosley, M.; Datte, P.; Erskine, D.; Fratanduono, D.; Frieders, G.; Galbraith, J.; Hammer, J.; Hess, Mark H.; Jackson, J.; Jennings, Christopher A.; Johnson, Drew J.; Koen, D.; Lusk, J.; Martinez, A.; Massey, W.; Mccarville, T.; Mcdonald, R.; Mclean, H.; Raman, K.S.; Rodriguez, S.; Spencer, Decker C.; Springer, P.; De Dios, G.V.; Wong, J.

Abstract not provided.

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TYPE Conference Poster YEAR 2019
OSTI

Trust me. QED

SIAM News

Heroux, Michael A.

Consider a standard SIAM journal article containing theoretical results. Each theorem has a proof that typically builds on previous developments. Since every theorem stems from a firm foundation, the research community can trust a result without further evidence. One could thus argue that a theorem does not require a proof because surely an author would not publish it if no proof existed to back it up. Furthermore, respectable reviewers and editors expect proofs without exception, and papers containing proof-less theorems will likely go unpublished.

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TYPE Journal Article YEAR 2019
OSTI
Results 20601–20800 of 96,771
Results 20601–20800 of 96,771