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This Special Issue focuses on the state-of-the-art results from the definition and design of filters for low- and high-frequency applications and systems. Different technologies and solutions are commonly adopted for filter definition, from electrical to electromechanical and mechanical solutions, from passive to active devices, and from hybrid to integrated designs. Aspects related to both theoretical and experimental research in filter design, CAD modeling and novel technologies and applications, as well as filter fabrication, characterization and testing, are covered. The proposed research articles deal with different topics as follows: Modeling, design and simulation of filters; Processes and fabrication technologies for filters; Automated characterization and test of filters; Voltage and current mode filters; Integrated and discrete filters; Passive and active filters; Variable filters, characterization and tunability.

History of engineering & technology --- analogue-to-digital conversion --- ATHOS soft X-ray beamline --- broadband noise --- Hall probe --- offset fluctuation and drift --- three-axis teslameter --- undulator --- power line communication (PLC) --- conducted disturbances --- anti-interference filter --- smart home --- low-pass filter (LPF) --- stepped impedance resonator (SIR) --- hairpin resonator --- internal coupling --- defected ground structure (DGS) --- current mode --- universal filter --- VCII --- voltage conveyor --- SIMO filter --- microwave dielectric ceramics --- filter --- additive manufacturing --- digital light processing --- post annealing --- dielectric properties --- wideband --- bandpass filter --- quarter wavelength --- stepped-impedance resonator (SIR) --- ultra-wideband --- stub-loaded --- stepped impedance resonator --- active filters --- anti-aliasing filters --- HBT --- inductorless --- low-pass filters --- SiGe --- switched-capacitor filters --- low-voltage --- finFET --- operational amplifier --- voltage-controlled oscillator --- unity-gain bandwidth --- varactor --- total harmonic distortion --- phase noise --- active inductor --- MMIC --- tunable filters

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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

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

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