Results 251 to 260 of about 524,705 (296)

Frequency Modulated Coupled Oscillator Arrays

31st European Microwave Conference, 2001, 2001
A linear array of oscillators each connected to a radiator to combine output power of the oscillators in free-space can be used in order to scan the radiated beam electronically by controlling free-running frequencies of both end oscillators. We applied this technique to Frequency Modulated Continuous Wave (FMCW) radar to perform electronically beam ...
Ragip Ispir, Akira Miyata, Kazunari Kawahata, Masao Ida, Yohei Ishikawa   +4 more
openaire   +1 more source

Frequency reconfigurable aperture coupled antenna

2012 6th European Conference on Antennas and Propagation (EUCAP), 2012
The design of wideband log-periodic aperture coupled with frequency agility is studied for modern-day wireless communication application. The antenna is constructed on FR-4 substrate. Seven square patches are used in a log-periodic formation to achieved wide bandwidth of 37% or from 3.8 GHz to 5.5 GHz.
M. F. Ismail, M. K. A. Rahim, H. A. Majid, M. R. Hamid, M. R. Kamarudin, N. A. Murad   +5 more
openaire   +2 more sources

Frequency locking in weakly coupled lasers

Optics Letters, 1985
An important question concerning coupled lasers is the range of optical-resonator length fluctuations over which frequency locking occurs. In this Letter, an analytical expression for the lock band is derived.
openaire   +2 more sources

Cross-frequency coupling and memory

Clinical Neurophysiology, 2016
According to an influential model, working memory (WM) depends on an interaction between neural oscillations of two different frequencies. This model assumes that individual items are represented by neural assemblies synchronized at high frequency. During maintenance of multiple items, these representations are reactivated during specific phases of ...
N. Axmacher, M. Leszczynski, J. Fell
openaire   +1 more source

Borehole coupling at sonic frequencies

GEOPHYSICS, 1990
An elastic plane wave incident on a borehole couples through the borehole wall to produce a compressional wave inside the borehole, and the effect of this coupling varies with incident angle. Imaging experiments that include a downhole source and/or hydrophones must account for this effect to achieve optimal results. In configurations pertinent to VSP
J. R. Lovell, B. E. Hornby
openaire   +1 more source

Frequency of Sexual Dysfunction in “Normal” Couples

New England Journal of Medicine, 1978
In analyzing the responses of 100 predominantly white, well educated and happily married couples to a self-report questionnaire, this study examined the frequency of sexual problems experienced and the relations of those problems to sexual satisfaction. Although over 80 per cent of the couples reported that their marital and sexual relations were happy
E, Frank, C, Anderson, D, Rubinstein
openaire   +2 more sources

Capacitance-Coupled Intermediate-Frequency Amplifiers

Proceedings of the IRE, 1947
This paper discusses the performance characteristics of capacitance-coupled intermediate-frequency-amplifier circuits. Double-ended loading is preferred to single-ended loading in order to satisfy practical tolerance requirements. An approximate method is treated for the design of capacitance-coupled attenuating traps for a television intermediate ...
M.J. Larsen, L.L. Merrill
openaire   +1 more source

Capacitively coupled radio frequency discharges

AIP Conference Proceedings, 1996
A review is given of research carried out on capacitively coupled radio frequency discharges in the Department of Engineering Science at Oxford University.
openaire   +1 more source

Radio-frequency coupling to plasmas

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 1988
A survey of the physics associated with coupling rf power to plasmas is given with emphasis on methods of analysis relevant to applications in the fields of plasma production, processing, and fusion research. The significance of resonant versus nonresonant coupling methods is discussed and specific applications are described where these phenomena ...
openaire   +1 more source

Photorefractive pulse coupling in the frequency domain

Optics Letters, 1993
We performed experiments to verify the theory of photorefractive pulse coupling in the frequency domain. In particular, we confirm that the phase added to the diffracted pulse depends quadratically on the relative delay between the two input pulses.
X S, Yao, J, Feinberg
openaire   +2 more sources