This book presents a comprehensive insight into the design techniques for different types of CP antenna elements and arrays In this book, the authors address a broad range of topics on circularly polarized (CP) antennas. Firstly, it introduces to the reader basic principles, design techniques and characteristics of various types of CP antennas, such as CP patch antennas, CP helix antennas, quadrifilar helix antennas (QHA), printed quadrifilar helix antennas (PQHA), spiral antenna, CP slot antennas, CP dielectric resonator antennas, loop antennas, crossed dipoles, monopoles and CP horns. Advanced designs such as small-size CP antennas, broadband, wideband and ultra-wideband CP antennas are also discussed, as well as multi-band CP antennas and dual CP antennas. The design and analysis of different types of CP array antennas such as broadband CP patch arrays, dual-band CP arrays, CP printed slot arrays, single-band and multi-band CP reflectarrays, high-gain CP waveguide slot antennas, CP dielectric resonator antenna arrays, CP active arrays, millimetre-waveband CP arrays in LTCC, and CP arrays with electronically beam-switching or beam-steering capabilities are described in detail. Case studies are provided to illustrate the design and implementation of CP antennas in practical scenarios such as dual-band Global Navigation Satellite Systems (GNSS) receivers, satellite communication mobile terminals at the S-band, Radio Frequency Identification (RFID) readers at 2.4 GHz, and Ka-band high-speed satellite communication applications. It also includes the detailed designs for a wideband Logarithmic spiral antenna that can operate from 3.4-7.7 GHz. In addition, the book offers a detailed review of the recent developments of different types of CP antennas and arrays. Presents comprehensive discussions of design techniques for different types of CP antennas: small-size CP antennas, broadband CP antennas, multi-band CP antennas and CP arrays.Covers a wide range of antenna technologies such as microstrip antennas, helix, quadrifilar helix antenna, printed quadrifilar helix antenna, dielectric resonator antennas, printed slots, spiral antennas, monopoles, waveguide slot arrays, reflectarrays, active arrays, millimetre-wave arrays in LTCC, electronically beam-switching arrays and electronically beam-steerable arrays.Reviews recent developments in different types of CP antennas and arrays, reported by industries, researchers and academics worldwide.Includes numerous case studies to demonstrate how to design and implement different CP antennas in practical scenarios.Provides both an introduction for students in the field and an in-depth reference for antenna/RF engineers who work on the development of CP antennas. Circularly Polarized Antennas will be an invaluable guide for researchers in R&D organizations; system engineers (antenna, telecom, space and satellite); postgraduates studying the subjects of antenna and propagation, electromagnetics, RF/microwave/millimetre-wave systems, satellite communications and so on; technical managers and professionals in the areas of antennas and propagation.

Professor Steven (Shichang) Gao is Chair of RF and Microwave Engineering at School of Engineering and Digital Arts, University of Kent, UK. He is Associate Editor of IEEE Transactions on Antennas and Propagation (2015-), a Distinguished Lecturer of IEEE Antennas and Propagation Society (2014-2016), General Chair of Loughborough Antennas and Propagation Conference (LAPC), UK, 2013, and Chair of Special Session on "Satellite Communication Antennas" in IEEE/IET International Symposium on Communication Systems and Networks, Poland, 2012, etc. He is a Keynote Speaker at AES'2014 (China, 2014), an Invited Speaker at IWAT'2014 (Sydney, 2014), SOMIRES'2013 (Japan, 2013), APCAP'2014 (China, 2014), etc. He is a Guest Editor of IEEE Transactions on Antennas and Propagation for a Special Issue on "Antennas for Satellite Communication"(April 2015), an Associate Editor of Radio Science (US), a member of the editorial boards of International Journal of Space Science and Engineering (US), IET Circuits, Devices and Systems (UK) and Chinese Journal of Radio Science (China). He is also the Editor for Wiley Book Series on "Microwave and Wireless Technologies". He is a Fellow of Institute of Engineering and Technology (IET), UK. He has two books including Space Antenna Handbook (Wiley, 2012) and Circularly Polarized Antennas (Wiley-IEEE, 2014), over 200 technical papers and several patents. His main areas of expertise are in antennas, smart antennas, phased arrays, MIMO, satellite antenna, RF/microwave/millimetre-wave/THz circuits and RF front ends (high-efficiency RF/microwave power amplifiers, filters), satellite communications, wireless power transfer, UWB radars, GNSS reflectometry, synthetic-aperture radars, remote sensing, electromagnetic modelling and small satellites.