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During the past few decades, information technologies have been evolving at a tremendous rate, causing profound changes to our world and to our ways of living. Emerging applications have opened u[ new routes and set new trends for antenna sensors. With the advent of the Internet of Things (IoT), the adaptation of antenna technologies for sensor and sensing applications has become more important. Now, the antennas must be reconfigurable, flexible, low profile, and low-cost, for applications from airborne and vehicles, to machine-to-machine, IoT, 5G, etc. This reprint aims to introduce and treat a series of advanced and emerging topics in the field of antenna sensors.

Technology: general issues --- 3D printing --- additive manufacturing --- Radio Frequency IDentification (RFID), chipless RFID --- mounted on metal --- unmanned aerial vehicle --- phased array --- frequency reconfiguration --- beam steering --- antioxidation --- frequency-reconfiguration --- liquid metal --- temperature sensor --- antenna sensor --- thermal expansion --- electrolyte-free --- industrial WSN --- ISA100.11a model --- ns-3 --- WSN --- UHF antennas --- ultra wideband antennas --- conformal antennas --- radio frequency identification --- elliptical dipole antenna --- EM/circuit co-simulation --- low-cost --- low-power --- power gating --- RF oscillator --- RTLS --- ultrawide band antennas --- biopotential sensing --- Fabry-Perot resonator --- antenna --- superstrate --- metamaterials --- passive sensing --- sensor array --- sparse array --- nonuniform array --- planar array --- random array --- low discrepancy sequence --- triband antenna --- wireless sensors --- planar patch antenna --- mobile applications --- DCS --- WLAN --- WiMAX --- circular polarization --- flexible --- polymer --- transparent --- wearable --- litz wire --- lateral misalignment --- magnetic field distribution --- mutual inductance --- Neumann integral formula --- planar spiral coil --- Internet of Things (IoT) --- wireless sensor network (WSN) --- switched-beam antenna --- electronically steerable parasitic array radiator (ESPAR) antenna --- received signal strength (RSS) --- direction-of-arrival (DoA) estimation --- 3D printing --- additive manufacturing --- Radio Frequency IDentification (RFID), chipless RFID --- mounted on metal --- unmanned aerial vehicle --- phased array --- frequency reconfiguration --- beam steering --- antioxidation --- frequency-reconfiguration --- liquid metal --- temperature sensor --- antenna sensor --- thermal expansion --- electrolyte-free --- industrial WSN --- ISA100.11a model --- ns-3 --- WSN --- UHF antennas --- ultra wideband antennas --- conformal antennas --- radio frequency identification --- elliptical dipole antenna --- EM/circuit co-simulation --- low-cost --- low-power --- power gating --- RF oscillator --- RTLS --- ultrawide band antennas --- biopotential sensing --- Fabry-Perot resonator --- antenna --- superstrate --- metamaterials --- passive sensing --- sensor array --- sparse array --- nonuniform array --- planar array --- random array --- low discrepancy sequence --- triband antenna --- wireless sensors --- planar patch antenna --- mobile applications --- DCS --- WLAN --- WiMAX --- circular polarization --- flexible --- polymer --- transparent --- wearable --- litz wire --- lateral misalignment --- magnetic field distribution --- mutual inductance --- Neumann integral formula --- planar spiral coil --- Internet of Things (IoT) --- wireless sensor network (WSN) --- switched-beam antenna --- electronically steerable parasitic array radiator (ESPAR) antenna --- received signal strength (RSS) --- direction-of-arrival (DoA) estimation

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This reprint is a reprint of the articles that appeared in Sensors' (MDPI) Special Issue on “Sensors and Systems for Indoor Positioning". The published original contributions focused on systems and technologies to enable indoor applications.

acoustic diffraction --- acoustic signal aberration --- cross-correlation aberration --- ultrasonic ranging --- visible light communication --- indoor positioning system --- fingerprint positioning --- weighted K-nearest neighbor --- distance metric --- ultrasonic transducers --- time of flight estimation --- pulse-echo technique --- ferroelectric films --- piezopolymer --- infrared sensor --- angle of arrival --- indoor localization --- wireless sensor networks --- navigation --- reinforcement learning --- 3D indoor positioning --- visible light positioning --- Wi-Fi positioning --- location fingerprinting --- RSSI-based positioning --- probabilistic approach --- information service --- book tracking --- fingerprint-based indoor positioning --- clustering --- RSSI --- CNN --- presence detection --- passive localization --- room impulse response --- acoustic localization --- frequency dependent attenuation --- ultrasonic signal --- cyber-physical system --- Industry 4.0 --- internet-of-reader --- IREAD 4.0 --- radio frequency identification --- RFID classification method --- smart gate --- smart forklift --- smart warehouse --- extended Kalman filter --- localization --- time of arrival --- carrier phase --- ambiguity resolution --- n/a

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• Reference Manager
• EndNote
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This reprint is a reprint of the articles that appeared in Sensors' (MDPI) Special Issue on “Sensors and Systems for Indoor Positioning". The published original contributions focused on systems and technologies to enable indoor applications.

Technology: general issues --- History of engineering & technology --- Energy industries & utilities --- acoustic diffraction --- acoustic signal aberration --- cross-correlation aberration --- ultrasonic ranging --- visible light communication --- indoor positioning system --- fingerprint positioning --- weighted K-nearest neighbor --- distance metric --- ultrasonic transducers --- time of flight estimation --- pulse-echo technique --- ferroelectric films --- piezopolymer --- infrared sensor --- angle of arrival --- indoor localization --- wireless sensor networks --- navigation --- reinforcement learning --- 3D indoor positioning --- visible light positioning --- Wi-Fi positioning --- location fingerprinting --- RSSI-based positioning --- probabilistic approach --- information service --- book tracking --- fingerprint-based indoor positioning --- clustering --- RSSI --- CNN --- presence detection --- passive localization --- room impulse response --- acoustic localization --- frequency dependent attenuation --- ultrasonic signal --- cyber-physical system --- Industry 4.0 --- internet-of-reader --- IREAD 4.0 --- radio frequency identification --- RFID classification method --- smart gate --- smart forklift --- smart warehouse --- extended Kalman filter --- localization --- time of arrival --- carrier phase --- ambiguity resolution --- acoustic diffraction --- acoustic signal aberration --- cross-correlation aberration --- ultrasonic ranging --- visible light communication --- indoor positioning system --- fingerprint positioning --- weighted K-nearest neighbor --- distance metric --- ultrasonic transducers --- time of flight estimation --- pulse-echo technique --- ferroelectric films --- piezopolymer --- infrared sensor --- angle of arrival --- indoor localization --- wireless sensor networks --- navigation --- reinforcement learning --- 3D indoor positioning --- visible light positioning --- Wi-Fi positioning --- location fingerprinting --- RSSI-based positioning --- probabilistic approach --- information service --- book tracking --- fingerprint-based indoor positioning --- clustering --- RSSI --- CNN --- presence detection --- passive localization --- room impulse response --- acoustic localization --- frequency dependent attenuation --- ultrasonic signal --- cyber-physical system --- Industry 4.0 --- internet-of-reader --- IREAD 4.0 --- radio frequency identification --- RFID classification method --- smart gate --- smart forklift --- smart warehouse --- extended Kalman filter --- localization --- time of arrival --- carrier phase --- ambiguity resolution