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algorithm amplitude analysis angle aperture applications approximation array band bandwidth beam boundary conditions broadband calculated cell channel circuit coefficients coil components computational coupling cylinder density derived dielectric diffraction dipole distribution domain edge effect effector efficiency electric field electromagnetic waves Electronic elements FDTD feed Figure finite force law Galilean invariant geometry Green's function grid ground plane gyrotron IEEE IEEE Trans imaging integral equation layer local-ether located Lorentz force law magnetic field matrix Maxwell's equations measured method microstrip antenna microwave mode observation obtained optical optimization parameters patch antenna permittivity phase planar polarization potential probe problem propagation proposed radar radiation pattern radio receiver References reflector antenna region resonant frequency scalar scalar potential scattering scheme shown in Fig shows signal simulation slot antenna solution space structure substrate surface technique theory transmission transmit University vector velocity waveguide wavelength wireless