Results 101 to 110 of about 25,408 (310)

Variable-beamwidth antenna without moving parts [PDF]

, 1975
Basic configuration consists of large parabolic dish reflector, smaller hyperboloidal subreflector, and two sets of monopulse feeds located in conjugate focal region on boresight axis of ...
Deerkoski, L. F., Schmidt, R. F.
core   +1 more source

Breathable Graphene Oxide‐Polymer Composite Membranes With Two‐Step Barrier Mechanism Against Nerve Agents

Advanced Functional Materials, EarlyView.
ABSTRACT Breathable membranes that reject chemical warfare agents (CWAs) are required for next‐generation protective apparel. A dual‐function graphene oxide (GO)‐polyamine architecture is introduced that addresses the long‐standing tradeoff between vapor transmission and CWA selectivity.
Hyungjun Kim, Chanui Lee, Keunhong Jeong, Seonggi Kim, Hyunju Shin, Sunghan Kim, Youngho Jin   +6 more
wiley   +1 more source

A 3D-Printed Spherical Dual-Circular Polarized Luneburg Lens Antenna for Ku-Band

IEEE Access
In this paper, we propose a novel three-dimensional-printed Luneburg lens for converting linear polarization to dual-circular polarization and successfully apply it in a multibeam antenna.
Qing Wang, Xiaohai Han, Pu Yu, Jian-Qiang Hou, Zhen-Ya Lei   +4 more
doaj   +1 more source

Low-loss frequency scanning planar array with hybrid feeding structure for low-altitude detection radar

The Journal of Engineering, 2019
A 1 × 4 low-loss frequency scanning planar array with hybrid feeding structure in Ku-band has been designed. In order to improve the array efficiency, the planar array was designed by four parallel sub-arrays and the waveguide slow-wave line structure ...
Hao Wang, Yaodan Zhang, Yan Wang, Shuanglong Quan, Dalong Xu   +4 more
doaj   +1 more source

Phase control circuits using frequency multiplications for phased array antennas [PDF]

, 1973
A phase control coupling circuit for use with a phased array antenna is described. The coupling circuit includes a combining circuit which is coupled to a transmission line, a frequency multiplier circuit which is coupled to the combining circuit, and a ...
Caron, P. R., Mailloux, R. J.
core   +1 more source

Additive Manufacturing of NiTi Shape Memory Alloys for Elastocaloric Applications: A Review

Advanced Functional Materials, EarlyView.
Additive manufacturing enables complex NiTi architectures that overcome key limitations in elastocaloric refrigeration, including poor heat transfer and high mechanical work input. This review surveys recent advances in LPBF‐ and DED‐fabricated NiTi shape memory alloys for elastocaloric applications, highlighting process–structure–performance ...
Ignatius Andre Setiawan, Mohammad Mehrali, Jaka Tušek, Shiva Mohajerani, Xiebin Wang, Dermot Brabazon, Mohammad Elahinia, Mehrshad Mehrpouya   +7 more
wiley   +1 more source

W-band low-sidelobe series-fed microstrip antenna array based on impedance matching section weighting method

The Journal of Engineering, 2019
A W-band low-sidelobe series-fed microstrip antenna array is proposed here. Impedance matching section weighting method is used in element series-fed weighting.
Song Song, Wei Wang, Xuetian Wang
doaj   +1 more source

A dual frequency microstrip antenna for Ka band [PDF]

For fixed satellite communication systems at Ka band with downlink at 17.7 to 20.2 GHz and uplink at 27.5 to 30.0 GHz, the focused optics and the unfocused optics configurations with monolithic phased array feeds have often been used to provide multiple ...
Baddour, M. F., Lee, R. Q.
core   +1 more source

CMB Telescopes and Optical Systems

, 2012
The cosmic microwave background radiation (CMB) is now firmly established as a fundamental and essential probe of the geometry, constituents, and birth of the Universe. The CMB is a potent observable because it can be measured with precision and accuracy.
A Kogut, A Kogut, A Kogut, A Oliveira-Costa de, A Oliveira-Costa de, A Olver, AA Klypin, ACS Readhead, AD Miller, AN Lasenby, APS Yadav, AR Levy, B Rabii, BG Keating, BG Keating, BP Crill, BR Johnson, BT Draine, BT Draine, C Barnes, C Dragone, C Dragone, C Dragone, C Dragone, C O’Sullivan, C O’Sullivan, CC Finlay, CL Bennett, CL Kuo, D Barkats, D Hanson, D Korsch, D O’Dea, DC Alsop, DJ Fixsen, DJ Fixsen, DS Swetz, DT Wilkinson, E Hecht, E Komatsu, E Pascale, E Shirokoff, EE Epstein, EJ Wollack, EK Conklin, EK Conklin, EM Leitch, EM Leitch, ES Cheng, ES Cheng, ES Seo, G Hinshaw, G Smoot, GA Seielstad, GF Smoot, GF Smoot, GP Nanos Jr, GS Tucker, H Tran, H Tran, HC Chiang, IA Strukov, IA Strukov, IA Strukov, J Singal, J Staren, J Zmuidzinas, JB Peterson, JC Baker, JC Mather, JE Carlstrom, JE Knoke, JE Ledden, JM Kovac, JM Lamarre, JM Uson, JR Bond, JR Hinderks, JR Pardo, JW Fowler, JW Fowler, JW Fowler, K Ganga, K Grainge, K Irwin, KK Schaffer, KS Stankevich, KW Brown, L Page, L Piccirillo, L Piccirillo, L Piccirillo, L Rudnick, LA Page, LA Page, Love, A., Antennas, I., & Society, P, M Dragovan, M Halpern, M Kamionkowski, M Shimon, M Su, M Tegmark, M Tegmark, M Zaldarriaga, MA Toral, MD Niemack, MJ Griffin, MM Hedman, N Caderni, N Jarosik, N Jarosik, N Mandolesi, NW Boggess, NW Halverson, OP Lay, P Ade, P Bernardis de, P Bernardis de, P Clarricoats, P Meinhold, PC Farese, PF Scott, PJE Peebles, PJE Peebles, PL Richards, PM Lubin, PR Meinhold, PR Meinhold, PS Henry, PT Timbie, PT Timbie, PT Timbie, R Fabbri, R Fabbri, R Keisler, R O’Brient, R Weiss, RA Sunyaev, RB Partridge, RB Partridge, RD Davies, RL Carpenter, RS Hill, RW Wilson, S Basak, S Chang, S Chang, S Das, S Hanany, S Hanany, S Hanany, S Padin, S Padin, SE Church, SP Boughn, SP Boughn, SR Dicker, SS Meyer, T Gaier, T Gaier, TheQubic Collaboration, TJ Pearson, VI Tatarskii, W Hu, W Welton, WA Imbriale, Y Ali-Haïmoud, Y Mizuguchi, Y Mizugutch, YD Takahashi, YN Pariiskii, YN Parijskij, Z Staniszewski   +172 more
core   +1 more source

Bio‐Inspired Multimodal Hardware Front‐End Enabled by 2D Floating‐Gate Memory for UAV Perception

Advanced Functional Materials, EarlyView.
A MoS2/h‐BN /graphene floating‐gate memory underpins a bio‐inspired multimodal front end that integrates visual, inertial, and airflow cues. A 4 × 4 FG memory array encodes temporal intensity differences, while IMU‐ and airflow‐driven threshold modulation suppresses self‐motion artifacts, enabling fast, low‐power, robust autonomous UAV tracking and ...
Lianghao Guo, Yue Cheng, Cong Li, Xiaoyu Guo, Jiankai Yin, Dadong Fan, Zhenyu Xu, Chenyu Tang, Arokia Nathan, Shuo Gao, Li Tao, Luigi G. Occhipinti   +11 more
wiley   +1 more source