tailieunhanh - Wave Propagation Part 10

Tham khảo tài liệu 'wave propagation part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | The Analysis of Hybrid Reflector Antennas and Diffraction Antenna Arrays on the Basis of Surfaces with a Circular Profile 307 analysis by a method of eigenfunctions and in approximations of GTD is carried out. The spherical diffraction antenna array allows to control amplitude end phase fields distribution on all aperture of HRA to provide high efficiency because of active radiating units of feeds do not shade of aperture to realize a combined amplitude multibase phase method of direction finding of the objects polarization selection of signals. The HRA s provide increasing of range of radars operation by 8-10 reduce the error of measurement of coordinates at 6-8 times reduction of probability of suppression of radar by active interferences by 20-30 . On the basis of such antennas use of MMIC technology of fabricate integrated feeds millimeter and centimeter waves is perspective. Embedding the micromodules into integral feeding-source antennas for HRA s and spherical diffraction antenna arrays for processing of the microwave information can be utilized for long-term evolution multifunctional radars. Future work includes a more detailed investigation the antennas for solving a problem of miniaturization of feeds for these antennas by means of MMIC technologies. 6. References Bucci . Elia . Romito G. 1996 . Synthesis Technique for Scanning and or Reconfigurable Beam Reflector Antennas With Phase-only Control. IEE . Antennas Propag. Vol. 143 No. 5 October . 402-412. Chantalat R. Menudier C. Thevenot M. Monediere T. Arnaud E. Dumon P. 2008 . Enhanced EBG Resonator Antenna as Feed of a Reflector Antenna in the Ka Band. IEEE Antennas and Wireless Propag. Vol. 7 . 349-353. Elsherbeni A. 1989 . High Gain Cylingrical Reflector Antennas with Low Sidelobes. AEU Band 43 Heft 6 . 362-369. Eom . Son . Jung . Jeon . ganin . Shubov . Tobolev . Shishlov . 2007 . Design and Test of a Mobile Antenna System With Tri-Band Operation for