Synthesis of Cylindrical Phased Array Based on Log-Periodic Dipole Antennas for Broadband Access Standard IEE802.11, IEE802.16

Abstract

Ключевые слова: диаграмма направленности; коэффициент стоячей волны; логопериодическая вибраторная антенна; стандарты беспроводного широкополосного доступа; цилиндрические фазированные антенные решетки. Аннотация: Рассмотрена методика синтеза цилиндрической фазированной антенной решетки на основе логопериодических вибраторных излучателей для стандартов беспроводного широкополосного доступа IEE802.11, IEE802.16.

Development of antenna system for use in meteorological and climatic control complexes

“…where 𝐹 𝛼 (𝜑) is the RP in the azimuthal plane of the independent radiator with the coordinate 𝛼 [1]. The equivalent linear radiator method is convenient for approximate calculation of the RP by (19).…”

“…In an equivalent linear antenna, the amplitude distribution , where 𝐷 𝑟 is the DG of the radiator at the maximum of its RP; 𝐹 0,𝑛 is the value of the radiator RP with coordinate 𝜑 = 𝛼 𝑛 in the direction of 𝜑 = 𝜑 0 . In turn, in the case of an amplitude distribution of the current |𝐼 𝑚,𝑛 | = |𝐼 𝑚,0 ||𝐼 𝑛,0 | in the z and α coordinates, which is important for practice, the RP of the cylindrical PHA can be represented as the product of the RP of the ring AA lying in the plane z = 0, by the multiplier of the linear system f z (θ) of radiators located on the cylinder element [1]:…”

“…">IntroductionCurrently, various upper-air sounding systems are available, such as, MARL-A, AVK-1, AIR-3A-RT2, RT-20, and MP3-3AT. Their characteristics are as follows: the operating frequency is 1680 MHz, 1790 MHz; antenna system characteristics (the type: mirror, passive antenna array (AA)); adaptive phased antenna array (APAA); azimuth scanning (electronic and electromechanical); elevation scanning (electronic and electromechanical) [1]. These complexes are quite cumbersome, and have a number of drawbacks, such as: a small number of radiosonde guidance (up to 5 targets simultaneously), a small range of tracking the probe (up to 20 ... 40 km), inability to quickly control the beam, in the horizontal plane it is of ± 180 degrees at a speed of 30 ... 40 rad/sec, and in the vertical plane from -30 to +140 degrees at 20 rad/sec.…”