Results 231 to 240 of about 87,664 (270)
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UHF ERES Antenna for UHF RFID Applications
2020 23rd International Microwave and Radar Conference (MIKON), 2020This paper presents Electronically Reconfigurable Superstrate (ERES) antenna capable of modifying the shape of the radiation pattern in an uncomplicated way. The approach adopted in this concept is based on switching the state of passive patch elements placed on an additional layer located above a simple microstrip patch antenna. In order to change the
R. Szymczuk +4 more
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IEEE Transactions on Broadcasting, 1999
The implementation of DTV is forcing every television broadcaster to purchase a new antenna. Choosing the best antenna to meet all of the station's needs is not a simple task. With tower space at a premium, tower leasing rates soaring, and FCC deadlines approaching quickly, the broadcaster faces new and non-traditional issues-for example: Do I co ...
D. Casciola, G.L. Miers, R.A. Surette
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The implementation of DTV is forcing every television broadcaster to purchase a new antenna. Choosing the best antenna to meet all of the station's needs is not a simple task. With tower space at a premium, tower leasing rates soaring, and FCC deadlines approaching quickly, the broadcaster faces new and non-traditional issues-for example: Do I co ...
D. Casciola, G.L. Miers, R.A. Surette
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Measurement Techniques, 2004
Measurements are reported on the dielectric constant and loss angle tangent for polyethylene, PTFE, BA-35 and 22KhS ceramics, and also grade KV fused silica of optical quality.
V. I. Voropaev +3 more
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Measurements are reported on the dielectric constant and loss angle tangent for polyethylene, PTFE, BA-35 and 22KhS ceramics, and also grade KV fused silica of optical quality.
V. I. Voropaev +3 more
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The Journal of the Institute of Television Engineers of Japan, 1962
UHF送信管には, 三極管, 四極管などの普通の真空管と同一原理に基づくものと, クライストロン, 進行波管などの速度変調原理に基づくものとがあるが, ここでは主として最近の極管系のUHF送信管について, 設計上, 応用上の問題点, 現在の趨勢について紹介した.
Fujiro Nakahara, Tokutaro Yamada
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UHF送信管には, 三極管, 四極管などの普通の真空管と同一原理に基づくものと, クライストロン, 進行波管などの速度変調原理に基づくものとがあるが, ここでは主として最近の極管系のUHF送信管について, 設計上, 応用上の問題点, 現在の趨勢について紹介した.
Fujiro Nakahara, Tokutaro Yamada
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International Journal of Mathematics, 2012
UHF flows are the flows obtained as inductive limits of flows on full matrix algebras. We will revisit universal UHF flows and give an explicit construction of such flows on a UHF algebra Mk∞ for any k and also present a characterization of such flows. Those flows are UHF flows whose cocycle perturbations are almost conjugate to themselves.
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UHF flows are the flows obtained as inductive limits of flows on full matrix algebras. We will revisit universal UHF flows and give an explicit construction of such flows on a UHF algebra Mk∞ for any k and also present a characterization of such flows. Those flows are UHF flows whose cocycle perturbations are almost conjugate to themselves.
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IEEE Transactions on Electron Devices, 1965
Measurements on a degenerate UHF photoparametric amplifier using an optical signal modulated at 690 MHz have confirmed the 3 dB noise figure predicted by Penfield and Sawyer. The silicon photoparametric diode served as both the photodetector and varactor and was novel in several respects: the conductivity sequence was p-v-n-n+in contrast to the usual p-
M.I. Grace, D.E. Sawyer
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Measurements on a degenerate UHF photoparametric amplifier using an optical signal modulated at 690 MHz have confirmed the 3 dB noise figure predicted by Penfield and Sawyer. The silicon photoparametric diode served as both the photodetector and varactor and was novel in several respects: the conductivity sequence was p-v-n-n+in contrast to the usual p-
M.I. Grace, D.E. Sawyer
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[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology, 2003
The design of a space diversity microwave combiner which is used to measure different parameters of mobile radio channels and to test algorithms in diversity is described. The transmission equipment uses a carrier at 890.2 MHz in a 6 W amplifier. The receiver and measuring equipment are mounted in a mobile van.
B. Feuvrie, J.F. Diouris, J. Saillard
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The design of a space diversity microwave combiner which is used to measure different parameters of mobile radio channels and to test algorithms in diversity is described. The transmission equipment uses a carrier at 890.2 MHz in a 6 W amplifier. The receiver and measuring equipment are mounted in a mobile van.
B. Feuvrie, J.F. Diouris, J. Saillard
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IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229), 2002
The use of fractal antenna techniques to reduce the size of a UHF linear dipole is investigated and discussed. Fractal designs are derived using an empirical method and a genetic algorithm based method. While both achieve size reduction, the latter design shows the most promise from a size reduction and design methodology standpoint, since simulation ...
S.D. Eason +5 more
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The use of fractal antenna techniques to reduce the size of a UHF linear dipole is investigated and discussed. Fractal designs are derived using an empirical method and a genetic algorithm based method. While both achieve size reduction, the latter design shows the most promise from a size reduction and design methodology standpoint, since simulation ...
S.D. Eason +5 more
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