Download or read book Design of a K Band Transmit Phased Array For Low Earth Orbit Satellite Communications written by and published by . This book was released on 2000 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design of a K band Transmit Phased Array for Low Earth Orbit Satellite Communications written by Thomas Watson and published by . This book was released on 2000 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Technology 1998 written by and published by DIANE Publishing. This book was released on with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book K Ka Band Receive Transmit Silicon Planar Phased Arrays for SATCOM written by Kevin Kai Wei Low and published by . This book was released on 2021 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation focuses on building state-of-the-art planar, all-silicon active electronically scanned array (AESA) for satellite communications (SATCOM) ground terminals and SATCOM on-the-move (SOTM) terminals, as well as emerging non geosynchronous orbits (GEO) SATCOM systems. Three Ka-band phased-arrays transmitters (a 256-element array capable of 1-D scan, a 256-element array capable of 2-D scan, and a 1024-element array capable of 2-D scan) and one K-band phased-array receiver (1024-element) are presented. The planar phased-arrays integrate commercially available silicon beamformer chips, silicon low noise amplifier (LNA) chips, printed Wilkinson divider/combiner beamforming network (BFN), and printed planar dual-polarized patch antennas on a single printed circuit board (PCB) and represent the highest level of integration at millimeter-waves. The 1024-element phased-arrays, in particular, have record results in published effective isotropic radiated power (EIRP) and gain to noise temperature (G/T) for K/Ka-band planar phased-arrays for SATCOM applications.
Download or read book IEEE International Symposium on Phased Array Systems and Technology written by and published by . This book was released on 2003 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ku Band Phased Arrays and K Band Communication Circuits and Systems in Advanced SiGe and CMOS SOI Technologies for SATCOM On the Move Applications written by Abdurrahman Aljuhani and published by . This book was released on 2020 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of electronically steerable antennas for Satellite Communication (SATCOM) applications has been limited for many years to mostly defense systems. Those planar phased antenna arrays were not able to penetrate the commercial SATCOM market due to their high cost, complex design, low yield, low production numbers, and time-consuming calibration needed for each antenna unit. This dissertation aims to make affordable SATCOM planar phased arrays with high yield and minimal calibration available for the commercial market. The low-cost phased arrays are not only useful for SATCOM on-the-move (SOTM) terminals, but similar phased-arrays can be built for point-to-point communications and low-power radars. This dissertation presents two affordable Ku-band dual-polarized receive-only (Rx) and transmit-only (Tx) phased-arrays with 256-elements. The phased antenna arrays can receive or transmit linear, rotated-linear, and circular polarization. Both designs archive state-of-the-art performance with wide-scan angles and high polarization purity. The array designs are based on a low-cost approach where beamformer chips are assembled on a printed circuit board (PCB) with dual-polarized antennas and an integrated Wilkinson combiner/divider network. An affordable and reliable PCB stack-up is developed for both designs and achieves a 100% yield. The two tile designs are scalable to allow large-scale phased-arrays construction with 1024 elements or higher. Also, one phased array can be calibrated, and then, the same calibration coefficients can be applied to different arrays, thereby significantly reducing the calibration time and cost of large-volume commercial arrays. The phased-arrays' near-ideal performance, scalable compact size, low-profile, and ultra-lightweight make them ideal for affordable Ku-band SATCOM terminals. Another critical parameter that determines the receive phased array size and, consequently, its cost is the required gain-to-noise--temperature (G/T). To maintain high G/T, a packaged low-noise amplifier (LNA) is needed near each antenna element. Therefore, this dissertation also demonstrates the designs of two stable packaged LNAs for a K-band SATCOM receive phased-array using two different technologies (SiGe and CMOS SOI). Both LNAs achieve state-of-the-art packaged performance in terms of gain, NF, and power consumption in both SiGe and CMOS processes. Additionally, a simplified simulation schematic is shown to provide an accurate representation of the packaging effects in a shorter time than the full 3D EM simulation model. Finally, a K-band phased-array beamformer channel with a novel 8-bit phase shifter and low phase imbalance gain control using 45nm CMOS SOI technology is presented. The channel has a measured peak gain of 24.2 dB with 3-dB bandwidth of 16.4-19.8 GHz and 2.5 dB NF. The phase shifter has a high resolution of 8-bit with the RMS phase and amplitude error of
Download or read book Ka Band Phased Array System Characterization written by and published by . This book was released on 2001 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Satellite Applications written by Joseph N. Pelton and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design of Broadband Right and Left handed Circular Polarization switchable Antenna Element and Sub array for Low Earth Orbit Satellite Communication written by 蔡昀廷 and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Systems Engineering of Phased Arrays written by Rick Sturdivant and published by Artech House. This book was released on 2018-11-30 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phased arrays, while traditionally used in radar systems, are now being used or proposed for use in internet of things (IoT) networks, high-speed back haul communication, terabit-per-second satellite systems, 5G mobile networks, and mobile phones. This book considers systems engineering of phased arrays and addresses not only radar, but also these modern applications. It presents a system-level perspective and approach that is essential for the successful development of modern phased arrays. Using practical examples, this book helps solve problems often encountered by technical professionals. Thermal management challenges, antenna element design issues, and architectures solutions are explored as well as the benefits and challenges of digital beam forming. This book provides the information required to train engineers to design and develop phased arrays and contains questions at the end of each chapter that professors will find useful for instruction.
Download or read book Research Technology 2000 written by and published by DIANE Publishing. This book was released on with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phase Shifter and LNA Design for Satellite Communication written by Luxsumi Jeevananthan and published by . This book was released on 2018 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phased arrays are being used in satellite communication systems in order to provide wireless data to mobile vehicles, ships and even aircrafts. This thesis focuses on the design of phase shifter, which is designed for the transmitter chain and low noise amplifier, which will be used in the receiver chain. The phase shifter is controlled using a digital-to-analog controller. This gives rise to quantization lobes which can fail the spectrum efficiency test. Careful analysis indicates that a minimum phase resolution needed for this application is around 6-bit. This research reviews various integrated circuit phase shifter topologies to come up with one that will meet the specifications for this system. A combination of reflective-type phase shifter and switch-type phase shifter is designed using 65-nm CMOS technology to provide a full 360 degree phase shift range with no power consumption. The measured insertion loss is about 13.05 +/- 2.75 dB at 29.75 GHz with a return loss of about 10 dB or greater. The antenna gain-to-temperature ratio, which is a common figure of merit used in satellite communication, must be met on the receiver side of the phased array system. Through link budget analysis, it was decided that two low noise amplifiers are needed to satisfy the specified gain-to-noise ratio; one off-chip low noise amplifier that is closer to the antenna and another on-chip low noise amplifier. This alleviates the constraints on both low noise amplifiers and allows for a more simple and cost-efficient design. This research focuses on the design of the on-chip low noise amplifier using 130-nm CMOS technology. The receiver chain operates in k-band; thus, the low noise amplifier is designed at 20 GHz. A gain of about 21 dB is achieved, with an output return loss above 10 dB, a 1-dB compression point at -23 dBm and a nominal power consumption of about 6.84 mW. The simulated noise figure for this low noise amplifier design is about 3.7 dB.
Download or read book Ku band Transmit Receive All Silicon Planar Phased Arrays for SATCOM and SOTM Terminals written by Gokhan Gultepe and published by . This book was released on 2021 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although phased array is a 100-year-old concept, the research and development efforts have been driven by the defense industry and radio astronomy for many decades. An active electronically scanned array (AESA) has also been getting popular in commercial satellite communications (SATCOM) and 5G cellular applications. With the recent advances in the silicon technologies, the cost barrier for commercial products has been broken down especially after the deployment of 5G wireless technologies. This dissertation focuses on building cost-efficient, all-silicon, planar, SATCOM phased arrays with agile beam steering for SATCOM ground and SATCOM on-the-move (SOTM) terminals, as well as emerging non-geosynchronous-orbit (NGSO) communication systems. It presents a 1024-element transmit (TX) and receive (RX) planar phased array pair and a 256-element scalable phased array tile with multi-satellite reception capability for Ku-band SATCOM terminals. All the three planar arrays employ silicon beamformer chips mounted on an affordable printed circuit boards, dual-polarized antennas to synthesize rotated linear polarization with high cross polarization rejection for Ku-band SATCOM applications and Wilkinson network with surface mount technology (SMT) resistors. The RX arrays also comprise silicon low-noise amplifiers (LNA) placed at the antenna terminals to increase antenna gain-to-noise temperature (G/T) without enlarging the array size. Record results in EIRP and G/T are demonstrated for the transmit and receive arrays, together with the first affordable two-beam phased-array for satellite and consumer terminal applications.
Download or read book Volumetric Phased Arrays for Satellite Communications written by William Chauncey Barott and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The high amount of scientific and communications data produced by low earth orbiting satellites necessitates economical methods of communication with these satellites. A volumetric phased array for demonstrating horizon-to-horizon electronic tracking of the NASA satellite EO-1 was developed and demonstrated. As a part of this research, methods of optimizing the elemental antenna as well as the antenna on-board the satellite were investigated. Using these optimized antennas removes the variations in received signal strength that are due to the angularly dependent propagation loss exhibited by the communications link. An exhaustive study using genetic algorithms characterized two antenna architectures, and included optimizations for radiation pattern, bandwidth, impedance, and polarization. Eleven antennas were constructed and their measured characteristics were compared to those of the simulated antennas. Additional studies were conducted regarding the optimization of aperiodic arrays. A pattern-space representation of volumetric arrays was developed and used with a novel tracking algorithm for these arrays. This algorithm allows high-resolution direction finding using a small number of antennas while mitigating aliasing ambiguities. Finally, a method of efficiently applying multiple beam synthesis using the Fast Fourier Transform to aperiodic arrays was developed. This algorithm enables the operation of phased arrays combining the benefits of aperiodic element position with the efficiency of FFT multiple beam synthesis. Results of this research are presented along with the characteristics of the volumetric array used to track EO-1. Experimental data and the interpretations of that data are presented, and possible areas of future research are discussed.
Download or read book Research Technology 1999 written by and published by DIANE Publishing. This book was released on with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Retrodirective Phased Array Antenna for Nanosatellites written by Justin W. Long and published by . This book was released on 2019 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a S-band phased array antenna for CubeSat applications. Existing state-of the-art high gain antenna systems are not well suited to the majority of CubeSats, those that fall within the 1U (10 cm x 10 cm x 10 cm) to 3U (10 cm x 10 cm x 30 cm) size ranges and in Low Earth Orbit (LEO). The system presented in this thesis is designed specifically to meet the needs of those satellites. This system is designed to fit on the 1U face (10 cm x 10 cm) of a CubeSat and requires no deployables. The use of beamforming and retrodirective algorithms reduces the pointing requirements of the antenna, easing the strict requirements that high gain antennas typically force on a CubeSat mission. Additionally, this design minimizes volume and uses low cost Commercial-off-the-Shelf (COTS) parts. This thesis discusses the theoretical background of phased array theory and retrodirective algorithms. Analysis are presented that show the characteristics and advantages of retrodirective phased antenna systems. Preliminary trade studies and design analyses show the feasibility and expected performance of a system utilizing existing COTS parts. The preliminary analysis shows that an antenna system can be achieved with ≥8.5 dBi of gain, 27dB of transmitted signal gain, 20% Power Added Efficiency (PAE) within a 1 W to 2 W power output, and an 80° effective beamwidth. Simulation results show an example antenna array that achieves 8.14 dBi of gain and an 82° effective beamwidth. Testing results on a prototype of the front-end electronics show that with minimal calibration, the beamforming and scanning error can be reduced to 5°. The power consumption and signal gain of the electronics is also verified through testing. The CubeSat Communications Platform, a CubeSat mission funded through the Air Force Research Laboratory is in Phase A design to demonstrate this antenna system, along with other experimental payloads. This thesis includes a discussion of interface control, mission requirements, operations, and a recommended experiment sequence to test and verify the antenna system on orbit.
Download or read book Navy s Needs in Space for Providing Future Capabilities written by National Research Council and published by National Academies Press. This book was released on 2005-07-18 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: The United States must operate successfully in space to help assure its security and economic well being. The Department of the Navy is a major user of space capabilities, although those capabilities are now primarily provided by DOD, the Air Force, and NOAA. Following a DOD assessment of national space security management in 2001, the Navy commissioned a Panel to Review Space to assess Navy space policy and strategy. As an extension of that review, the NRC was requested by the Navy to examine its needs in space for providing future operational and technical capabilities. This report presents a discussion of the strategic framework of future space needs, the roles and responsibilities for meeting those needs, an assessment of Navy support to space mission areas, and a proposed vision for fulfilling Naval forces space needs.
