Acu-check Chebyshev filter Fourier series expansion Goubau line Hall probe History of engineering & technology LED array S parameters THz absorber Tibetan Plateau X-band antenna measurements balanced bandpass filter bandpass filter bonding wire bone lesion detection carbon-composite material cavity common mode suppression compromising emanations computers and information processing data acquisition dipole dipole and horn antennas dispersion electromagnetic compatibility electromagnetic emissions electromagnetic infiltration electromagnetic simulation electromagnetic waves