Results 341 to 350 of about 2,627,966 (379)
Some of the next articles are maybe not open access.
Ultra-High Frequency Superconductive Devices
1991Abstract : 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 ...
openaire +1 more source
Ultra-high frequency emission from GaAs
Physics Letters A, 1968Abstract Ultra-high frequency emission from n-type GaAs is observed as the acoustoelectric domain hits the anode of the crystal. Emission is attributed to the piezoelectric character of the anode region. Experimental technique described here is believed to be a useful tool in analyzing the frequency components and the attenuation of the ...
D.S. Zoroglu, I.C. Chang
openaire +1 more source
An Oscillator for Ultra-High Frequencies
Review of Scientific Instruments, 1938A 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.
openaire +1 more source
Ultra-high-frequency switches and filters
Proceedings of the IEE - Part IIIA: Television, 1952The paper discusses the uses of filters and switches in u.h.f. radiorelay links. Typical requirements for such components are given and possible designs reviewed.As examples, designs of filters and switches used in the London-Birmingham television radio-relay link are given in detail. The switch employs resonant stub-lines placed in shunt with the main
openaire +1 more source
Diffraction Measurements at Ultra-High Frequencies
Proceedings of the IRE, 1941Ultra-high-frequency field strengths are difficult to predict theoretically because of the inability to separate the effects of diffraction, reflection, and refraction on the measured field. A successful attempt was made to measure the diffraction effect alone.
openaire +1 more source
Meteor echoes at ultra-high frequencies
Journal of Geophysical Research, 1957It is proposed that, at ultra-high frequencies, underdense meteor echoes have an effective scattering length L, which is much less than a Fresnel zone. Consequently, UHF meteoric echoes may be analyzed in terms of Fraunhofer diffraction theory, resulting in a relaxation of the requirement that a meteor trail be perpendicular to the radar line-of-sight ...
openaire +1 more source
Ultra-High Frequency Radio For Students
Nature, 1949THESE Second World War and the succeeding years have seen a great extension of the use of radio waves of very high frequency, largely as a result of the stimulus provided by the development of radar, and of television and frequency-modulation broadcasting systems. It is therefore perhaps not surprising that there have appeared recently several books on
openaire +1 more source
An Ultra-High-Frequency Aircraft Receiver
1938An ultra-high-frequency aircraft receiver.
openaire +1 more source
Ultra-high frequency cadmium-sulphide transducers
IEEE Transactions on Sonics and Ultrasonics, 1964Cadmium-sulphide diffusion-layer transducers have been made in a variety of structures, with fundamental frequencies from below 100 Mc to above 1000 Mc for longitudinal mode, and to 300 Mc for shear-mode operation. Conversion losses from 7 db to 28 db with 15% bandwidth were obtained over this frequency range.
openaire +1 more source