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Estimating directivity and gain of antennas
IEEE Antennas and Propagation Magazine, 1998Gain is the most important performance parameter of an antenna. However, in many practical situations it is not possible to measure or calculate the gain of an antenna. Also, the interest in wireless applications has increased the need of system engineers to accurately estimate antenna gain. Many simple formulas are available for estimating gain.
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Gain and directivity of exponential horn receivers
Journal of the Acoustical Society of America, 2016The self-noise of acoustical sensors limits their capacity to monitor extremely quiet environments and measure the subtle, adventitious cues that animals routinely rely upon. Although primarily used in sound production, horns also can amplify sound prior to transduction by a microphone.
Daniel J. Mennitt, Kurt Fristrup
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Directivity, super-gain and information
IRE Transactions on Antennas and Propagation, 1956In this paper some analogies between antenna theory and the theory of optical resolving power are analyzed. The effect of the finite size of a rotating antenna on the informational content of the echo is discussed, without taking into account noise. From this point of view, the most important feature of the aerial is the highest angular frequency which
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On the gain and beamwidth of directional antennas
IRE Transactions on Antennas and Propagation, 1958A formula is given for the maximum gain of a class of antennas having fields expressible as a finite number of spherical wave functions. This maximum gain can be achieved for arbitrarily polarized radiation fields, and it can be related to antenna size by requiring the near fields to be small in magnitude.
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Certain Factors Affecting the Gain of Directive Antennas*
Bell System Technical Journal, 1930This paper analyzes the performance of antenna arrays as influenced by certain variables within the control of the designing engineer. It starts with an extremely simple analysis of the interfering effects produced by two sources of waves of the same amplitude.
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Direct Bonded Microchip Gain Aperture Laser System
2022 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2022We report on gain apertured pre-amplifier system for a microchip laser with beam cleaning stage. Increase in output is expected by use high peak power pump laser diodes both for oscillator and pre-amplifier. In addition, bonded chips for efficient heat removal are incorporated into setup in order to improve overall system performance.
Arvydas Kausas +3 more
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A Goal-Directed Approach to Gaining Compliance
Communication Research, 2004This research examines how particular face threats intrinsic to compliance gaining goals constrain compliance gaining behaviors, finding that (a) threats to certain negative and positive face wants differentiate compliance gaining goals from each other; (b) compliance gaining goals are distinct from each other in their arrangements of the number and ...
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Directional coupler switches with optical gain
IEEE Journal of Quantum Electronics, 1986We discuss the design and characteristics of directional coupler switches in semiconductor materials (GaAs/GaAlAs) which exhibit optical gain by laser action. Equal gain in the bar and cross states is achieved by carrier-induced changes in the real as the well as the imaginary parts of the refractive index in directional coupler structures.
C. Setterlind, L. Thylen
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Direct observation of ordering in (GaIn) P
Journal of Materials Research, 1988Gax In1 − x Pepilayers grown under a range of growth conditions by organometallic vapor phase epitaxy (OMVPE) on GaAs substrates have been studied in the electron microscope. The results show the presence of an ordering of the group III sublattice parallel to some of the {111} planes.
S. McKernan +4 more
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A Framework of Directional-Gain Beamforming and a White-Noise-Gain-Controlled Solution
IEEE/ACM Transactions on Audio, Speech, and Language Processing, 2022Chao Pan 0001, Jingdong Chen
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