Antenna systems with beam forming and beam steering capabilities for HF skywave radars

被引：3
|
作者：
Uluisik, Cagatay [1 ]
机构：
[1] Dogus Univ, Elect & Commun Engn Dept, TR-34722 Istanbul, Turkey
来源：
TURKISH JOURNAL OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCES | 2010年 / 18卷 / 03期
关键词：
HF radars; HF communication; Skywaves; ionospheric reflections; Earth- ionosphere waveguide; planar arrays; phased array antennas; beam forming; beam steering; PERIODIC LINE ARRAY; SURFACE-WAVE RADARS; DIPOLES; DOMAIN;
D O I：
10.3906/elk-0912-12
中图分类号：
TP18 [人工智能理论];
学科分类号：
081104 ; 0812 ; 0835 ; 1405 ;
摘要：
Radiation characteristics of linearly phased, periodic, planar dipole arrays, which can be used as transmitting/receiving antenna systems for HP skywave radars, are investigated. Rectangular, triangular and trapezoidal arrays are proposed in obtaining different beam shapes in the desired directions. Beam steering is achieved by adjusting the inter-element phase increments coherently. The effects of vertical array-tilt with a desired take-off angle (TOA) alpha are presented by a number of radiation pattern examples. The ground effect is investigated using the image theory by assuming the Earth's surface as perfectly electric conductor (PEG). Radiated fields are obtained using Floquet wave representations plus the synthetic aperture approach. Validation is done against element-by-element summation representations.
引用
收藏
页码：485 / 498
页数：14
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