上海交大-天线技术-第一章绪论-e.ppt

* 81 Antenna for Sat Comm. on Motion * 相控阵天线 * 相控阵天线 * Other * 电磁炮，高斯枪 电磁炮又称交流同轴线圈炮。它是电磁炮的最早形式，由加速线圈和弹丸线圈构成。根据通电线圈之间磁场的相互作用原理而工作的。加速线圈固定在炮管中，当它通入交变电流时，产生的交变磁场就会在弹丸线圈中产生感应电流。感应电流的磁场与加速线圈电流的磁场互相作用，产生电磁场力，使弹丸加速运动并发射出去。 THz antenna * THz antenna * Nano antenna * Photonic crystal Significance Concepts Frequency Wavelength Spectrum Electrical length * Significance (cont.) Spectrums and names * km m cm mm THz nm …… * Spectrum * Spectrum * * * Military spectrum * Broadcast spectrum * UHF * Significance (cont.) The development of wireless comm.: The spatial signal can’t be simply digitized The environment influenced the spatial signal greatly Performance of T/R antenna, impedance match 3G/4G antennastable, wide band Miniaturization of mobile terminal other * Significance (cont.) Other Civil/army wireless comm. Radar, remote sensing Special use * Diagram of wireless comm. * Anywhere * * antenna on Airship * Trend Miniaturization Wideband, conformal Multi frequency Multi antenna Smart antenna Integrated antenna for several system, non-foster Power harvesting Other new tech. (nano-ant., metamaterial material) * Research Ways Circuit method Equivalent load Resonant structure EM field theory Maxwell equation Near/far field Radiation Boundary condition Joint of the circuit and field * Analysis Method for Antenna EM Computation Method of Moments The Finite Difference Time Domain Technique Finite element method Optimization Genetic Algorithms Particle Swarm Optimizer FAST CEM Mixed method Parallel Computation * EM Simulation Software CST （FIT/Fem/FMM） XFDTD （FDTD） HFSS (Finite element method--Fem） ANSYS （Fem） FEKO （FEM/MOM/FMM） FEMLAB/Comsol（Fem） IE3D （Method of Moments_MOM ） NEC4 （MOM ） ADS (2.5 Dimenssion) AWR/Microwave office (2.5 Dimenssion) * Open Source Software MEEP Other open source software for FDTD, MOM * Content Basic theory and parameters Feeding network for antennas Small Antenna UWB antenna RFID antenna Antenna design method