Results 221 to 230 of about 175,414 (264)

Ultra-high-frequency power amplifiers

Proceedings of the IEE - Part B: Radio and Electronic Engineering, 1958
The paper examines a few of the problems associated with the design and construction of power amplifiers operating in the frequency band 300–3000 Mc/s.Various types of amplifier are considered in turn, and the advantages and disadvantages of each particular class are examined in some detail.
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Ultra-thin absorbers for ultra-high frequency RFID systems

2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013
The possibility to design ultra-thin absorbers within ultra-high frequency range by employing low-cost materials is investigated. The proposed materials would be particularly useful to improve the reading performance of RFID readers in complex environments.
COSTA, FILIPPO, GENOVESI, SIMONE, MONORCHIO, AGOSTINO, MANARA, GIULIANO   +3 more
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Ultra high frequency acoustic waves

Contemporary Physics, 1962
Abstract Two different experimental techniques are available for making ultra-high-frequency acoustic measurements. These are (i) the study of light-scattering (for solids and liquids), and (ii) the use of microwaves (so far mainly restricted to solids).
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High-sensitive ultra-low frequency hydrophone

International Conference on Micro- and Nano-Electronics 2018, 2019
In this paper we demonstrate a new prototype of a high-precision ultra-low-frequency hydrophone on the basis of a planar type electrochemical transducer (ECT). We have developed a new planar electrochemical microchip and have invented a mechanical system that allows detecting the alternating pressure at low frequencies up to 0.01 Hz.
Vladimir G. Krishtop, Alexey Y. Belyaev, Alexander S. Zlobin, Pavel V. Dudkin, Sergey V. Kokhanovsky, Dmitry A. Zhevnenko, Tatiana V. Krishtop   +6 more
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The Telegraphist's Equations at Ultra-High Frequencies

Physics, 1935
The telegraphist's or long line equations are derived from the Maxwell field equations for ultra-high frequencies. By taking into account retardation and the time rate of change of current, a new circuit parameter is obtained in addition to the four usually found in the conventional low frequency equations.
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Vacuum Tube Electronics at Ultra-High Frequencies

Proceedings of the IRE, 1933
Vacuum tube electronics are analyzed when the time of flight of the electrons is taken into account. The analysis starts with a known current, which in general consists of direct-current value plus a number of alternating-current components. The velocities of the electrons are associated with corresponding current components, and from these velocities ...
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Ultra-High Frequency Superconductive Devices

1991
Abstract : The objective of this research program was to develop advanced superconducting tunnel junctions for application in superconducting local oscillators and superconducting mixers operating in the Terahertz (0.2 - 2.0 THz) frequency regime. The research was focused on the development of stable, all refractory, high-critical-current-density ...
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A Very-High-Frequency Ultra-High-Frequency Tail-Cap Antenna

Proceedings of the IRE, 1951
A description is given of a broad-band vhf-uhf antenna for a small, single-engine type of aircraft consisting of the vertical stabilizer that is tip-fed by the metal tail cap. The resulting antenna covers the frequency range of 100 to 400 mc, is vertically polarized, and has radiation patterns that are essentially omnidirectional.
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Feedback in Very-High-Frequency and Ultra-High-Frequency Oscillators

Proceedings of the IRE, 1950
This paper covers a study of feedback considerations in low-power negative-gnrd triode oscillators for the frequency range of 100 to 1,000 Mc. Discussion is mainly confined to oscillators using a single tuned circuit between grid and plate in the modified Colpitts circuit wherein the feedback is provided by the internal tube capacitances.
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An Oscillator for Ultra-High Frequencies

Review of Scientific Instruments, 1938
A coaxial line stabilized oscillator that is easily and rapidly adjustable over the frequency range from 70 to 700 Mc per sec. is described. Rugged mechanical construction, substantially complete shielding and coaxial line output connection are other features.
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