This work presents the design, theory, and measurement of a linearly polarized microstrip patch antenna with a substrate-integrated compensation mechanism to mitigate the detuning effects from a physical deformation (e.g., bending and twisting). In particular, we investigate the ability of an antenna to maintain its impedance bandwidth as it bends sharply through the center (from flat up to 90º pivoted about the ground plane). Compensation for this bending occurs through the displacement of electromagnetically functionalized colloidal dispersions (EFCDs) in a substrate-embedded capillary. Stability of the 2:1 VSWR (matched impedance) bandwidth has been examined numerically across the entire range of bending, and demonstrated experimentally using fixed-bend patch antennas on 4 mm thick isocane foam substrates to illustrate this concept.
{"title":"A Substrate Integrated Fluidic Compensation Mechanism for Deformable Antennas","authors":"S. Long, G. Huff","doi":"10.1109/AHS.2009.70","DOIUrl":"https://doi.org/10.1109/AHS.2009.70","url":null,"abstract":"This work presents the design, theory, and measurement of a linearly polarized microstrip patch antenna with a substrate-integrated compensation mechanism to mitigate the detuning effects from a physical deformation (e.g., bending and twisting). In particular, we investigate the ability of an antenna to maintain its impedance bandwidth as it bends sharply through the center (from flat up to 90º pivoted about the ground plane). Compensation for this bending occurs through the displacement of electromagnetically functionalized colloidal dispersions (EFCDs) in a substrate-embedded capillary. Stability of the 2:1 VSWR (matched impedance) bandwidth has been examined numerically across the entire range of bending, and demonstrated experimentally using fixed-bend patch antennas on 4 mm thick isocane foam substrates to illustrate this concept.","PeriodicalId":318989,"journal":{"name":"2009 NASA/ESA Conference on Adaptive Hardware and Systems","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126991675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper represents a design technique for hardening circuits mapped onto FPGAs. An effective and simple algorithm for signal probabilities has been used to detect SEU (single event upset) sensitive gates for a given circuit. The circuit can be hardened against radiation effects by applying triple modular redundancy (TMR) technique to only these sensitive gates. Selective TMR is tested against different circuits to prove its efficacy. With a small loss of SEU immunity, the proposed scheme can greatly reduce the area overhead as compare to TMR technique. Selective TMR scheme along with the readback and reconfiguration features of FPGAs can result into a very effective SEU mitigation technique.
{"title":"Notice of Violation of IEEE Publication Principles>BR>Selective Triple Modular Redundancy for Single Event Upset (SEU) Mitigation","authors":"X. She, P. Samudrala","doi":"10.1109/AHS.2009.9","DOIUrl":"https://doi.org/10.1109/AHS.2009.9","url":null,"abstract":"This paper represents a design technique for hardening circuits mapped onto FPGAs. An effective and simple algorithm for signal probabilities has been used to detect SEU (single event upset) sensitive gates for a given circuit. The circuit can be hardened against radiation effects by applying triple modular redundancy (TMR) technique to only these sensitive gates. Selective TMR is tested against different circuits to prove its efficacy. With a small loss of SEU immunity, the proposed scheme can greatly reduce the area overhead as compare to TMR technique. Selective TMR scheme along with the readback and reconfiguration features of FPGAs can result into a very effective SEU mitigation technique.","PeriodicalId":318989,"journal":{"name":"2009 NASA/ESA Conference on Adaptive Hardware and Systems","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125256552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, non deterministic Indirect Reinforcement Learning (RL) techniques for controlling the transmission times and power of Wireless Network nodes are presented. Indirect RL facilitates planning and learning which ultimately leads to convergence on optimal actions with reduced episodes or time steps compared to direct RL. Three Dyna architecture based algorithms for non deterministic environments are presented. The results show improvements over direct RL and conventional static power control techniques.
{"title":"Indirect Reinforcement Learning for Autonomous Power Configuration and Control in Wireless Networks","authors":"A. Udenze, K. Mcdonald-Maier","doi":"10.1109/AHS.2009.51","DOIUrl":"https://doi.org/10.1109/AHS.2009.51","url":null,"abstract":"In this paper, non deterministic Indirect Reinforcement Learning (RL) techniques for controlling the transmission times and power of Wireless Network nodes are presented. Indirect RL facilitates planning and learning which ultimately leads to convergence on optimal actions with reduced episodes or time steps compared to direct RL. Three Dyna architecture based algorithms for non deterministic environments are presented. The results show improvements over direct RL and conventional static power control techniques.","PeriodicalId":318989,"journal":{"name":"2009 NASA/ESA Conference on Adaptive Hardware and Systems","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125283095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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