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Antenna arrays --- Metamaterials

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This Special Issue gathers topics of utmost interest in the field of antennas and propagation, such as: new directions and challenges in antenna design and propagation; innovative antenna technologies for space applications; metamaterial, metasurface and other periodic structures; antennas for 5G; electromagnetic field measurements and remote sensing applications.

Technology: general issues --- Energy industries & utilities --- 5G mobile communication --- Sub-6-GHz --- compact antenna --- channel selection --- channel filters --- metamaterials --- antenna radiation measurements --- common mode current --- distance averaging --- multipath site --- small antenna --- loop probe --- log-periodic dipole array --- wideband antenna --- VHF --- cross polarized --- array element --- radio detection --- cosmic rays --- ultra-wide band antennas --- energy-based antenna descriptors --- pulsed sources --- direction finding --- dual-band dipole --- CRLH antenna --- dual-band balun --- CRLH balun --- wireless communication --- textile antenna --- wearable antenna --- SAR --- flexible antenna --- low-profile antenna --- sensor network --- active test --- UWB --- 802.15.4z --- timestamp detection --- ranging --- multipath --- frequency fading --- dye-sensitized solar cells --- integration --- antenna array --- solar antenna --- multibandoperation --- slotted antenna --- microwave --- millimeter-wave band --- WLAN --- 5G --- frequency multiplexed --- IoT --- millimeter-waves --- multi-band --- n-band antenna --- antenna as a sensor --- meander line antenna --- periodic structure --- millimeter-wave antenna --- frequency scanning antenna --- leaky-wave antenna --- planar sensor --- non-invasive --- Split Ring Resonator --- dielectrics measurements --- RF absorbing materials --- higher symmetries --- glide symmetry --- periodic structures --- mode matching --- dispersion analysis --- radar cross section (RCS) measurement --- near-field to far-field transformation (NFFFT) --- spherical wave expansion (SWE) --- anisotropy --- dielectric constant --- material characterization --- planar resonators --- substrate bending --- textile fabrics --- wearable radiators --- reflectarray antennas --- multibeam antennas --- dual band reflectarrays --- communication satellites --- Ka-band --- near-field antenna effect --- radar calibration --- MIMO radar --- turntable radar --- UWB radar --- radar system --- scattering imaging --- inverse scattering problem --- radar resolution --- photomixer --- terahertz source --- two dimensional photonic crystal --- frequency selective surface superstrate --- terahertz antenna --- dielectric resonator antenna --- biomedical devices --- wireless communication link --- near-field region --- impedance matching characteristics --- horizontal polarization --- UAV ground station --- Omni-directional --- wireless power transmission (WPT) --- energy harvesting --- rectenna --- wireless sensors --- n/a

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This Special Issue gathers topics of utmost interest in the field of antennas and propagation, such as: new directions and challenges in antenna design and propagation; innovative antenna technologies for space applications; metamaterial, metasurface and other periodic structures; antennas for 5G; electromagnetic field measurements and remote sensing applications.

Technology: general issues --- Energy industries & utilities --- 5G mobile communication --- Sub-6-GHz --- compact antenna --- channel selection --- channel filters --- metamaterials --- antenna radiation measurements --- common mode current --- distance averaging --- multipath site --- small antenna --- loop probe --- log-periodic dipole array --- wideband antenna --- VHF --- cross polarized --- array element --- radio detection --- cosmic rays --- ultra-wide band antennas --- energy-based antenna descriptors --- pulsed sources --- direction finding --- dual-band dipole --- CRLH antenna --- dual-band balun --- CRLH balun --- wireless communication --- textile antenna --- wearable antenna --- SAR --- flexible antenna --- low-profile antenna --- sensor network --- active test --- UWB --- 802.15.4z --- timestamp detection --- ranging --- multipath --- frequency fading --- dye-sensitized solar cells --- integration --- antenna array --- solar antenna --- multibandoperation --- slotted antenna --- microwave --- millimeter-wave band --- WLAN --- 5G --- frequency multiplexed --- IoT --- millimeter-waves --- multi-band --- n-band antenna --- antenna as a sensor --- meander line antenna --- periodic structure --- millimeter-wave antenna --- frequency scanning antenna --- leaky-wave antenna --- planar sensor --- non-invasive --- Split Ring Resonator --- dielectrics measurements --- RF absorbing materials --- higher symmetries --- glide symmetry --- periodic structures --- mode matching --- dispersion analysis --- radar cross section (RCS) measurement --- near-field to far-field transformation (NFFFT) --- spherical wave expansion (SWE) --- anisotropy --- dielectric constant --- material characterization --- planar resonators --- substrate bending --- textile fabrics --- wearable radiators --- reflectarray antennas --- multibeam antennas --- dual band reflectarrays --- communication satellites --- Ka-band --- near-field antenna effect --- radar calibration --- MIMO radar --- turntable radar --- UWB radar --- radar system --- scattering imaging --- inverse scattering problem --- radar resolution --- photomixer --- terahertz source --- two dimensional photonic crystal --- frequency selective surface superstrate --- terahertz antenna --- dielectric resonator antenna --- biomedical devices --- wireless communication link --- near-field region --- impedance matching characteristics --- horizontal polarization --- UAV ground station --- Omni-directional --- wireless power transmission (WPT) --- energy harvesting --- rectenna --- wireless sensors

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The Terahertz frequency range (0.1 – 10)THz has demonstrated to provide many opportunities in prominent research fields such as high-speed communications, biomedicine, sensing, and imaging. This spectral range, lying between electronics and photonics, has been historically known as “terahertz gap” because of the lack of experimental as well as fabrication technologies. However, many efforts are now being carried out worldwide in order improve technology working at this frequency range. This book represents a mechanism to highlight some of the work being done within this range of the electromagnetic spectrum. The topics covered include non-destructive testing, teraherz imaging and sensing, among others.

Research & information: general --- W band --- Schottky Diode Detectors --- ZBD modeling --- wire bonding --- flip-chip --- Terahertz radar --- radar cross-section --- signal-to-noise ratio --- adaptive range gates --- cascaded doubler --- quadrupler --- Schottky varactor --- hybrid integrated circuit --- terahertz spectroscopy --- optical delay line --- correction --- optical encoder --- terahertz spectra --- terahertz metrology --- bias --- sub-harmonic mixer --- anti-series --- Schottky diode --- conversion loss --- terahertz wave generation --- InGaAs --- molecular beam epitaxy --- time-domain spectroscopy --- photoconductive antenna --- open stone relics --- hollowing --- weathered --- preservation of cultural heritage --- THz-TDS --- rubber --- vulcanization --- silica dispersion --- terahertz imaging --- light field imaging --- synthetic aperture imaging --- image distortion --- resolving power --- THz detector --- rectangular inset-feed patch antenna --- catadioptric horn-like lens --- CMOS process --- resonances --- periodic waveguides --- reflection phases --- topological properties --- oscillator --- THz --- high output power --- CMOS --- terahertz waves --- honeycomb sandwiches --- foreign materials --- time-of-flight --- electric field

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In recent years, rapid development in robotics, mobile, and communication technologies has encouraged many studies in the field of localization and navigation in indoor environments. An accurate localization system that can operate in an indoor environment has considerable practical value, because it can be built into autonomous mobile systems or a personal navigation system on a smartphone for guiding people through airports, shopping malls, museums and other public institutions, etc. Such a system would be particularly useful for blind people. Modern smartphones are equipped with numerous sensors (such as inertial sensors, cameras, and barometers) and communication modules (such as WiFi, Bluetooth, NFC, LTE/5G, and UWB capabilities), which enable the implementation of various localization algorithms, namely, visual localization, inertial navigation system, and radio localization. For the mapping of indoor environments and localization of autonomous mobile sysems, LIDAR sensors are also frequently used in addition to smartphone sensors. Visual localization and inertial navigation systems are sensitive to external disturbances; therefore, sensor fusion approaches can be used for the implementation of robust localization algorithms. These have to be optimized in order to be computationally efficient, which is essential for real-time processing and low energy consumption on a smartphone or robot.

Technology: general issues --- Energy industries & utilities --- dynamic objects identification and localization --- laser cluster --- radial velocity similarity --- Pearson correlation coefficient --- particle filter --- trilateral indoor positioning --- RSSI filter --- RSSI classification --- stability --- accuracy --- inertial navigation system --- artificial neural network --- motion tracking --- sensor fusion --- indoor navigation system --- indoor positioning --- indoor navigation --- radiating cable --- leaky feeder --- augmented reality --- Bluetooth --- indoor positioning system --- smart hospital --- indoor --- positioning --- visually impaired --- deep learning --- multi-layered perceptron --- inertial sensor --- smartphone --- multi-variational message passing (M-VMP) --- factor graph (FG) --- second-order Taylor expansion --- cooperative localization --- joint estimation of position and clock --- RTLS --- indoor positioning system (IPS) --- position data --- industry 4.0 --- traceability --- product tracking --- fingerprinting localization --- Bluetooth low energy --- Wi-Fi --- performance metrics --- positioning algorithms --- location source optimization --- fuzzy comprehensive evaluation --- DCPCRLB --- UAV --- unmanned aerial vehicles --- NWPS --- indoor positioning systems --- GPS denied --- GNSS denied --- autonomous vehicles --- visible light positioning --- mobile robot --- calibration --- appearance-based localization --- computer vision --- Gaussian processes --- manifold learning --- robot vision systems --- image manifold --- descriptor manifold --- indoor fingerprinting localization --- Gaussian filter --- Kalman filter --- received signal strength indicator --- channel state information --- indoor localization --- visual-inertial SLAM --- constrained optimization --- path loss model --- particle swarm optimization --- beacon --- absolute position system --- cooperative algorithm --- intercepting vehicles --- robot framework --- UWB sensors --- Internet of Things (IoT) --- wireless sensor network (WSN) --- switched-beam antenna --- electronically steerable parasitic array radiator (ESPAR) antenna --- received signal strength (RSS) --- fingerprinting --- down-conversion --- GPS --- navigation --- RF repeaters --- up-conversion --- n/a