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Electromagnetic (EM) waves carry energy through propagation in space. This radiation associates with entangled electric and magnetic fields which must exist simultaneously. Although all EM waves travel at the speed of light in vacuum, they cover a wide range of frequencies called the EM spectrum. The various portions of the EM spectrum are referred to by various names based on their different attributes in the emission, transmission, and absorption of the corresponding waves and also based on their different practical applications. There are no certain boundaries separating these various portions, and the ranges tend to overlap. Overall, the EM spectrum, from the lowest to the highest frequency (longest to shortest wavelength) contains the following waves: radio frequency (RF), microwaves, millimeter waves, terahertz, infrared, visible light, ultraviolet, X-rays, and gamma rays. This Special Issue consists of sixteen papers covering a broad range of topics related to the applications of EM waves, from the design of filters and antennas for wireless communications to biomedical imaging and sensing and beyond.

bonding wire --- S parameters --- electromagnetic simulation --- port embedding --- balanced bandpass filter --- common mode suppression --- spurline --- source–load coupling --- stepped impedance resonator (SIR) --- open-ended waveguide --- slow-wave --- endfire --- radiation --- dispersion --- gain --- energy verification --- Hall probe --- dipole --- movable slit --- Goubau line --- non-invasive blood glucose measurement --- Acu-check --- lancet --- leaky waves --- surface waves --- ultra-wideband --- THz absorber --- high absorption --- polarization independent --- holography --- microwave imaging --- microwave measurement system --- nondestructive testing --- electromagnetic compatibility --- protection of information --- electromagnetic emissions --- computers and information processing --- data acquisition --- image recognition --- pattern recognition --- image processing --- graphic information --- LED array --- laser printer --- compromising emanations --- electromagnetic infiltration --- reconstruction --- non-invasive data acquisition --- Fourier series expansion --- nanorod --- multimode --- propagation characteristics --- guided wave --- bandpass filter --- half-wavelength resonator --- insertion loss --- phantom measurement system --- bone lesion detection --- ground penetrating radar --- reverse time migration --- Tibetan Plateau --- permafrost active layer --- internal structure --- Chebyshev filter --- cavity --- metamaterial --- waveguide --- X-band --- meta-resonator --- machine learning --- material identification --- microwave sensor array --- microwave waveguide --- dipole and horn antennas --- carbon-composite material --- graphene --- antenna measurements --- electromagnetic waves --- n/a --- source-load coupling

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The aim of this book is to highlight some recent advances in microwave planar devices. The development of planar technologies still generates great interest because of their many applications in fields as diverse as wireless communications, medical instrumentation, remote sensing, etc. In this book, particular interest has been focused on an electronically controllable phase shifter, wireless sensing, a multiband textile antenna, a MIMO antenna in microstrip technology, a miniaturized spoof plasmonic antipodal Vivaldi antenna, a dual-band balanced bandpass filter, glide-symmetric structures, a transparent multiband antenna for vehicle communications, a multilayer bandpass filter with high selectivity, microwave planar cutoff probes, and a wideband transition from microstrip to ridge empty substrate integrated waveguide.

microwave tunable phase shifters --- 3 dB/90° coupler --- K band --- HD --- MSP --- RF --- SVM --- wireless sensing technology --- antenna design --- constrained optimization problems --- coral reefs optimization algorithm --- meta-heuristics --- antenna --- MIMO --- octagonal --- planar --- UWB --- vivaldi antenna --- miniaturized --- high gain --- surface plasmons --- ultrawideband --- microwave sensor --- differential sensor --- dielectric characterization --- microfluidics --- electrically small resonators --- biosensors --- dual-band differential filter --- common-mode suppression --- magnetic coupling --- multilayer structure --- glide symmetry --- higher symmetries --- Maxwell fish-eye lens --- metasurface --- periodic structures --- printed circuit board --- coplanar waveguides --- vehicular networks --- IEEE 802.11p --- indium-tin oxide (ITO) --- transparent antenna --- bandpass filter --- discriminating coupling --- high selectivity --- source-load coupling --- plasma diagnostics --- electron density measurement --- planar microwave cutoff probe --- bar-type cutoff probe --- ring-type cutoff probe --- computational characterization --- substrate integrated waveguide --- ridge waveguide --- tapering structure --- broadband --- microwave devices --- n/a

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Electromagnetic (EM) waves carry energy through propagation in space. This radiation associates with entangled electric and magnetic fields which must exist simultaneously. Although all EM waves travel at the speed of light in vacuum, they cover a wide range of frequencies called the EM spectrum. The various portions of the EM spectrum are referred to by various names based on their different attributes in the emission, transmission, and absorption of the corresponding waves and also based on their different practical applications. There are no certain boundaries separating these various portions, and the ranges tend to overlap. Overall, the EM spectrum, from the lowest to the highest frequency (longest to shortest wavelength) contains the following waves: radio frequency (RF), microwaves, millimeter waves, terahertz, infrared, visible light, ultraviolet, X-rays, and gamma rays. This Special Issue consists of sixteen papers covering a broad range of topics related to the applications of EM waves, from the design of filters and antennas for wireless communications to biomedical imaging and sensing and beyond.

History of engineering & technology --- bonding wire --- S parameters --- electromagnetic simulation --- port embedding --- balanced bandpass filter --- common mode suppression --- spurline --- source-load coupling --- stepped impedance resonator (SIR) --- open-ended waveguide --- slow-wave --- endfire --- radiation --- dispersion --- gain --- energy verification --- Hall probe --- dipole --- movable slit --- Goubau line --- non-invasive blood glucose measurement --- Acu-check --- lancet --- leaky waves --- surface waves --- ultra-wideband --- THz absorber --- high absorption --- polarization independent --- holography --- microwave imaging --- microwave measurement system --- nondestructive testing --- electromagnetic compatibility --- protection of information --- electromagnetic emissions --- computers and information processing --- data acquisition --- image recognition --- pattern recognition --- image processing --- graphic information --- LED array --- laser printer --- compromising emanations --- electromagnetic infiltration --- reconstruction --- non-invasive data acquisition --- Fourier series expansion --- nanorod --- multimode --- propagation characteristics --- guided wave --- bandpass filter --- half-wavelength resonator --- insertion loss --- phantom measurement system --- bone lesion detection --- ground penetrating radar --- reverse time migration --- Tibetan Plateau --- permafrost active layer --- internal structure --- Chebyshev filter --- cavity --- metamaterial --- waveguide --- X-band --- meta-resonator --- machine learning --- material identification --- microwave sensor array --- microwave waveguide --- dipole and horn antennas --- carbon-composite material --- graphene --- antenna measurements --- electromagnetic waves --- bonding wire --- S parameters --- electromagnetic simulation --- port embedding --- balanced bandpass filter --- common mode suppression --- spurline --- source-load coupling --- stepped impedance resonator (SIR) --- open-ended waveguide --- slow-wave --- endfire --- radiation --- dispersion --- gain --- energy verification --- Hall probe --- dipole --- movable slit --- Goubau line --- non-invasive blood glucose measurement --- Acu-check --- lancet --- leaky waves --- surface waves --- ultra-wideband --- THz absorber --- high absorption --- polarization independent --- holography --- microwave imaging --- microwave measurement system --- nondestructive testing --- electromagnetic compatibility --- protection of information --- electromagnetic emissions --- computers and information processing --- data acquisition --- image recognition --- pattern recognition --- image processing --- graphic information --- LED array --- laser printer --- compromising emanations --- electromagnetic infiltration --- reconstruction --- non-invasive data acquisition --- Fourier series expansion --- nanorod --- multimode --- propagation characteristics --- guided wave --- bandpass filter --- half-wavelength resonator --- insertion loss --- phantom measurement system --- bone lesion detection --- ground penetrating radar --- reverse time migration --- Tibetan Plateau --- permafrost active layer --- internal structure --- Chebyshev filter --- cavity --- metamaterial --- waveguide --- X-band --- meta-resonator --- machine learning --- material identification --- microwave sensor array --- microwave waveguide --- dipole and horn antennas --- carbon-composite material --- graphene --- antenna measurements --- electromagnetic waves