Download or read book Experimental Study of Near field Beamforming Techniques in K band Waveguide Arrays Using Improved Shielding Techniques written by Arsalan Hasan and published by . This book was released on 2006 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Study of Conformal K band Waveguide Arrays for Near Field Beam Forming Applications written by Phanindra Nath Pagadala and published by . This book was released on 2007 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book RF Antenna Beam Forming written by Shun-Ping Chen and published by Springer Nature. This book was released on 2023-03-24 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is designed for both the scientific audience, research and development engineers and the university students. The fundamentals of radio frequency antenna beam forming is explained in this book. The principles of beam focusing and beam steering in near field and far field are visualized with 2D and 3D simulations and compared with measurement results. Besides linear and planar antenna arrays, also conformal arrays, i.e. concave and convex antenna arrays, suitable for certain applications, are investigated and presented. Also related applications of radio frequency beam forming like open loop and closed loop large scale antenna arrays or massive MIMO, which is one of the break-through technologies for 5G and future 6G and involves an extremely large number of antenna elements for the multi-user beam forming, as well as thinned antenna arrays with electrically large distances between the antenna elements are discussed.
Download or read book Theoretical and Experimental Study of Conformal X band Waveguide Array for Near field Medical Applications written by Anil Edupuganti and published by . This book was released on 2008 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wideband Beamforming written by Wei Liu and published by John Wiley & Sons. This book was released on 2010-03-18 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an excellent reference for all professionals working in the area of array signal processing and its applications in wireless communications. Wideband beamforming has advanced with the increasing bandwidth in wireless communications and the development of ultra wideband (UWB) technology. In this book, the authors address the fundamentals and most recent developments in the field of wideband beamforming. The book provides a thorough coverage of the subject including major sub-areas such as sub-band adaptive beamforming, frequency invariant beamforming, blind wideband beamforming, beamforming without temporal processing, and beamforming for multi-path signals. Key Features: Unique book focusing on wideband beamforming Discusses a hot topic coinciding with the increasing bandwidth in wireless communications and the development of UWB technology Addresses the general concept of beamforming including fixed beamformers and adaptive beamformers Covers advanced topics including sub-band adaptive beamforming, frequency invariant beamforming, blind wideband beamforming, beamforming without temporal processing, and beamforming for multi-path signals Includes various design examples and corresponding complexity analyses This book provides a reference for engineers and researchers in wireless communications and signal processing fields. Postgraduate students studying signal processing will also find this book of interest.
Download or read book Design Simulation and Experimental Testing of Near Field Null Formation in K Band Conformal Waveguide Antenna Arrays written by Mohammed Shoab Siddiqui and published by . This book was released on 2004 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of Near field Focusing Properties K Band Waveguide Array with Tapered in Current Distribution written by Amish Pandya and published by . This book was released on 2004 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Study of Near field Beam Focussing Properties of 3 element X band Conformal Wave guide Array written by Muhammad Faisal Iqbal and published by . This book was released on 2004 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of Conformal Antenna Array Beamforming Characteristics Using K band Waveguide Elements written by Nithin Reddy Gudur and published by . This book was released on 2010 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project will focus on the application of advanced electromagnetic simulation software 4NEC2 for the far-field characterization of a 3-element K-band array of waveguide antenna. Previous modeling efforts have shown a significant difference between simulated and measured data. The key effort in this project will be to minimize the difference between simulated and measured data by use of the 4NEC2 software. The simulation will be carried out on both a 3-element array of open-ended waveguides. The main application of these arrays in the far-field is in satellite K-band applications, where we would require multiple beams that can be controlled in beamwidth and position. The conformal nature of the array described in this work has the ability to control the beam positions and beamwidth by adjusting the conformal nature of the array.
Download or read book Modal Analysis and Synthesis of Broadband Nearfield Beamforming Arrays written by P. Thushara D. Abhayapala and published by . This book was released on 1999 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis considers the design of a beamformer which can enhance desired signals in an environment consisting of broadband nearfield and/or farfield sources. The thesis contains: a formulation of a set of analysis tools which can provide insight into the intrinsic structure of array processing problems; a methodology for nearfield beamforming; theory and design of a general broadband beamformer; and a consideration of a coherent nearfield broadband adaptive beamforming problem. To a lesser extent, the source localization problem and background noise modeling are also treated. A set of analysis tools called modal analysis techniques which can be used to a solve wider class of array signal processing problems, is first formulated. The solution to the classical wave equation is studied in detail and exploited in order to develop these techniques. Three novel methods of designing a beamformer having a desired nearfield broadband beampattern are presented ...
Download or read book Design and Experimental Testing of Conformal K Band Waveguide Arrays with Tapered out Current Distributions written by Vijay Pulipati and published by . This book was released on 2004 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Robust Directional Transmission Beamforming Techniques for Smart Antenna Systems written by Laurie Anne Bigler and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current developments in smart antenna technology include the use of adaptive antenna arrays to directively transmit and receive data from the mobile user. Implementing adaptive antennas only on uplink enhances the signal quality and provides considerable range extension for a cell site, but does not allow for significant increases in capacity. However, utilizing adaptive antennas for both uplink and downlink rejects co-channel interference to the degree that mobiles located at spatially distinct angles from the base station and mobiles located at shorter reuse distances can operate on the same frequency channel. Unfortunately, robust beamforming techniques for downlink have not been developed. Previous research studies have given theoretical performance comparisons of, primarily, DOA-based beamforming techniques for uplink transmissions. Very few RF experiments have been conducted which evaluate adaptive beamforming techniques in a real environment. In this thesis, experimental studies are conducted to evaluate adaptive beamforming techniques and determine a robust downlink transmission beamforming approach. Experimental data is presented which demonstrates the stability of strong specular DOAs over a 25 MHz frequency range, and the robust performance of a new integrated DOA-based beamforming approach for both uplink and downlink transmissions. The spatial signature beamforming approach is shown to perform better than DOA-based beamforming on uplink, but to be less robust on downlink for Frequency Division Duplex (FDD) systems. Additional research is needed to validate these results for larger frequency differences in both cellular and PCS bands.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1983 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Beamforming Techniques and Interference Mitigation Using a Multiple Feed Array for Radio Astronomy written by Chad K. Hansen and published by . This book was released on 2004 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radio frequency interference has become a large problem to radio astronomers. This thesis proposes the idea that radio frequency interference can be mitigated using a phased array feed in conjunction with a large reflector. A phased array feed would allow radio astronomers to observe fainter signals than is currently possible, while at the same time enabling rapid sky surveys. A phased array feed was designed and simulated, and sensitivity optimization was performed on the array feed. It was shown that higher sensitivity can be achieved using a 7-element phased array feed than with a conventional waveguide feed. Simulations were ran using RFI mitigation algorithms on the array to show that interference cancellation can, in principle, be performed using a phased array feed. In addition to these simulations, improvements were made to a previously designed RF receiver so that radio astronomy observations could be made and interference mitigation algorithms tested on a receiver platform.
Download or read book Near field Beamforming Using Microphone Arrays written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research in Progress written by and published by . This book was released on 1991 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1997 with total page 940 pages. Available in PDF, EPUB and Kindle. Book excerpt:
