Tag: Array

Free Download Multibeam Phased Array Antennas as Satellite Constellation Ground Station
English | 2024 | ISBN: 9819979099 | 188 Pages | PDF EPUB (True) | 30 MB
This book focuses on the multi-beam phased array antenna as a satellite ground station. As there are already many excellent books on phased array antennas in the literature, this book focuses mainly on some engineering practices and fills the gap between principles and practices, such as array excitation error impact analysis and calibration methods, array geometry design for hemispherical coverage, multiple beam resource management, etc. This book is particularly suitable for readers interested in satellite constellation design or satellite ground station design. This book also benefits researchers and engineers in the fields of phased array antennas, aerospace engineering, telecommunications, etc.

Free Download Circular Array-Based Radio Frequency OAM Communications
English | 2024 | ISBN: 3031375882 | 443 Pages | PDF EPUB (True) | 52 MB
This book presents the modeling and transmission theory of RF OAM communications. The book features the UCA-based RF point-to-point OAM communication system, the UCA-based RF point-to-multipoint OAM wireless backhaul network, the HCCL structure for long-distance OAM transmissions, and the UCA-based joint OAM RadCom scheme. For the UCA-based RF point-to-point OAM communication system, a 2-D ESPRIT-based distance and AoA estimation method is first introduced, followed by an OAM reception scheme including the hybrid mechanical and electronic beam steering with the estimated AoA and the amplitude detection with the estimated distance. The proposed RF OAM communication scheme is extended to the RF OAM-MIMO system equipped with UCCAs. For the UCA-based RF point-to-multipoint OAM wireless backhaul network, an OAM-based multi-user distance and AoA estimation method is introduced, followed by a multi-user OAM preprocessing scheme. At last, the proposed methods are extended to the downlink multi-user OAM-MIMO wireless backhaul system equipped with UCCAs. Moreover, a novel HCCL structure is introduced to realize long-distance OAM transmission. For the UCA-based joint OAM RadCom scheme, an OAM-based 3-D super-resolution position estimation and rotation velocity detection method is introduced, and then the PCRB of the OAM-based estimates and the transmission rate of the integrated system are derived and analyzed. To achieve the best performance trade-off, the transmitted integrated OAM beams is optimized by means of an exhaustive search method. Finally, this book discusses future research directions to inspire further investigation in the field of RF OAM communications from different perspectives.

Free Download John Wilkinson, "My Reef My Manifest Array"
English | 2019 | pages: 192 | ISBN: 1784106917 | EPUB | 0,4 mb
In 1487, Sir Henry Bodrugan, pursued for treason, leapt from a Cornish clifftop into a waiting boat and fled to France. Bodrugan’s Leap, as the clifftop has come to be known, lies close to John Wilkinson’s childhood home, and supplies the title for the central cycle of poems in My Reef My Manifest Array. That totemic image of exile feeds an interest in borders and partings that runs throughout the collection. The Cornish landscape of the poet’s childhood, loaded with new significance following the death of his sister, is Wilkinson’s primary locus, but he ventures-flees, perhaps-farther afield, to Portland (Maine), Chicago, Sydney, and Busan. Combining extended sequences with brief lyrics, Wilkinson’s lines tie minuscule linguistic knots that give pleasure when unwoven. The reading becomes archaeological as layers and layers of meaning, of feeling, of reason are exposed.

Free Download Conformal Array Antenna Theory and Design (IEEE Press Series on Electromagnetic Wave Theory) By Lars Josefsson, Patrik Persson
2006 | 496 Pages | ISBN: 0471465844 | PDF | 10 MB
This is the first comprehensive treatment of conformal antenna arrays from an engineering perspective. While providing a thorough foundation in theory, the authors of this publication provide a wealth of hands-on instruction for practical analysis and design of conformal antenna arrays. Thus, you get the knowledge you need, alongside the practical know-how to design antennas that are integrated into such structures aircrafts or skyscrapers.

Free Download Array Beamforming Enabled Wireless Communications
English | 2023 | ISBN: 1032430885 | 464 Pages | PDF (True) | 26 MB
Combining with the current development needs and trends of wireless communication technology around the world, the authors explore the potentials and challenges of large-scale antenna array beamforming technology in next-generation mobile communication and some important emerging application scenarios. The book first introduces the basic structure of antenna array hierarchical codebook and channel estimation with high dimensionality, with which the time cost of searching the channel information can be effectively reduced. It then explicates high-efficiency beamforming transmission methods for point-to-point transmission, full-duplex point-to-point transmission, and point-to-multipoint transmission where array beamforming enabled non-orthogonal multiple access (NOMA) technologies for typical two-user systems and general multi-user systems are emphasized. The book also discusses array beamforming enabled unmanned aerial vehicle (UAV) communications and array beamforming enabled space/air/ground communications, with the uniqueness and relative solutions for single UAV systems and multi-UAV networks being analyzed.