Angel Ramos received the BS in Telecommunication Engineering, the MS in Electronic Engineering and the PhD in Electronic, Automatic and Communication Engineering from Universitat Rovira i Virgili (URV), Tarragona, Spain, in 2010, 2011 and 2015, respectively. Since 2015, he works as a Research Fellow at Laboratoire de Conception et d’Integration des Systemes (LCIS), Grenoble-INP, France. He is the author or co-author of 14 peer-reviewed journal papers and 12 international conference papers. He has worked as a reviewer for IEEE Transactions on Microwave Theory and Techniques, IEEE Microwave and Wireless Components Letters, and IEEE Sensors Journal, among others. His research interests are: radar applied to remote sensing, RFID, UWB and wireless sensors. Antonio Lazaro received the M.S. and Ph.D. degrees in telecommunication engineering from the Universitat Politècnica de Catalunya (UPC), Barcelona, Spain, in 1994 and 1999, respectively. Since 2004, he joined the Department of Electronic Engineering, Universitat Rovira i Virgili (URV), Tarragona, Spain, where he teaches courses on microwave circuits and antennas. His research interests are microwave device modelling, on-wafer noise measurements, advanced CMOS compact modelling, monolithic microwave integrated circuits (MMICs), RFMEMS, RFID, UWB radar applications, and wireless sensors. He has authored more than 80 peer-reviewed scientific journals, and several international, and national conference papers. He is member of IEEE and the editorial board of International Journal of Distributed Sensor Networks. He participates in several projects featuring RFID and microwave systems. David Girbau received the BS in Telecommunication Engineering, MS in Electronics Engineering and PhD in Telecommunication from Universitat Politècnica de Catalunya (UPC), Barcelona, Spain, in 1998, 2002 and 2006. From 2001 to 2007 he was a Research Assistant with the UPC. From 2005 to 2007 he was a Part-Time Assistant Professor with the Universitat Autònoma de Barcelona (UAB). In October 2007 he became a Full-Time Professor at Universitat Rovira i Virgili (URV). His research interests include microwave devices and systems, with emphasis on UWB, RFIDs, RF-MEMS and wireless sensors. He is author or co-author of 43 papers in indexed journals and more than 70 contributions to conferences. He serves as reviewer of several Journals in the field of microwaves and antennas. Ramón Villarino became a Member of IEEE in 2004, he received the Telecommunications Technical Engineering degree from the Ramon Llull University (URL), Barcelona, Spain in 1994, the Senior Telecommunications Engineering degree from the Polytechnic University of Catalonia (UPC), Barcelona, Spain in 2000 and the PhD from the UPC in 2004.During 2005-2006, he was a Research Associate at the Technological Telecommunications Center of Catalonia (CTTC), Barcelona, Spain. He worked at the Autonomous University of Catalonia (UAB) from 2006 to 2008 as a Researcher and Assistant Professor. Since January 2009 he is a Full-Time Professor at Universitat Rovira i Virgili (URV). His research activities are oriented to radiometry, microwave devices and systems, based on UWB, RFIDs and frequency selective structures using MetaMaterials (MM).

• Chapter 1: Introduction to RFID and Chipless RFIDChapter 2: Chipless Time-Coded UWB RFID: Reader, Signal Processing and Tag DesignChapter 3: Wireless Sensors Using Chipless Time-Coded UWB RFIDChapter 4: Semi-Passive Time-coded UWB RFID: Analog and Digital ApproachesChapter 5: Wireless Sensors using Semi-Passive UWB RFIDChapter 6: Active Time-coded UWB RFIDChapter 7: Indoor Localization with Smart Floor Based on Time-coded UWB RFID and Ground Penetrating Radar