353 Hits in 6.2 sec

Shared Aperture Multibeam Forming of Time-Modulated Linear Array

Li-juan Sun, Zhen-kai Zhang, Hamid Esmaeili Najafabadi
2019 Complexity  
A novel technique is proposed in this paper for shared aperture multibeam forming in a complex time-modulated linear array.  ...  First, a uniform line array is interleaved randomly to form two sparse array subarrays. Subsequently, the theory of time modulation for linear arrays is applied in the constructed subarrays.  ...  In this paper, a new shared aperture method is proposed based on the time-modulated linear array (TMLA) for shared aperture multibeam forming.  ... 
doi:10.1155/2019/4101909 fatcat:2f6sc3zohvddrif5thpgnbkngu

Adaptive Multichannel Terahertz Communication by Space-Time Shared Aperture Metasurfaces

Hooman Barati Sedeh, Mohammad Mahdi Salary, Hossein Mosallaei
2020 IEEE Access  
frequencies and progressive modulation phase delays across the metasurface aperture, rendering a shared aperture in space-time.  ...  We introduce the concept of space-time shared aperture metasurfaces (STSAMs) to enable multifrequency multibeam scanning with simultaneous and independent control toward adaptive multichannel communication  ...  His current research interests include studying the effects of introducing temporal variation in physical systems and design of optical metasurfaces.  ... 
doi:10.1109/access.2020.3030200 fatcat:2wizyjosqbb7bgkghd4dwlj55m

Table of contents

2020 IEEE Transactions on Antennas and Propagation  
Zhang 5405 Design of Shared Aperture Radar Arrays With Low Sidelobe Level of the Two-Way Array Factor .... J. N.  ...  Luk 5344 Null Beamsteering Using Distributed Arrays and Shared Aperture Distributions ........................................... ................................................ K. Buchanan, J.  ... 
doi:10.1109/tap.2020.2998991 fatcat:4zvrl4eb5zchlhr42vdn5jg6uy

Programmable Active Mirror: A Scalable Decentralized Router

Austin Fikes, Parham P. Khial, Samir Nooshabadi, Ali Hajimiri
2020 IEEE transactions on microwave theory and techniques  
Index Terms-Aperture, integrated circuits, phased array, scalable relay, true time delay (TTD). 1 R B = B · log 2 (SNR + 1). Manuscript  ...  separated elements that do not share a common timing reference.  ...  Abiri for his contribution to the integrated circuit digital interface and the members of the Caltech Holistic Integrated Circuits Lab for their help in determining a clear and complete approach for presenting  ... 
doi:10.1109/tmtt.2020.3042516 fatcat:bnsyw2lxojdtzfzg6hsje27qvm

Feasibility Study of a W-Band Multibeam Heterodyne Receiver for the Gregorian Focus of the Sardinia Radio Telescope

A. Navarrini, L. Olmi, R. Nesti, P. Ortu, P. Marongiu, A. Orlati, A. Scalambra, A. Orfei, J. Roda, A. Cattani, S. Leurini, F. Govoni (+4 others)
2022 IEEE Access  
The goal specification of the receiver is a 4 × 4 focal plane array operating in dual-linear polarization with a front-end consisting of feed-horns placed in cascade with waveguide Orthomode Transducers  ...  The FoV covered by the 4 × 4 array is 2.15 × 2.15 arcmin 2 , unfilled, with separation between contiguous elements of 43 arcsec.  ...  medium and of star-forming regions.  ... 
doi:10.1109/access.2022.3153492 fatcat:uzdnib5hrvbtpmyjtyuwrfdgki

Orthogonal Versus Zero-Forced Beamforming in Multibeam Antenna Systems: Review and Challenges for Future Wireless Networks

Yanki Aslan, Antoine Roederer, Nelson J. G. Fonseca, Piero Angeletti, Alexander Yarovoy
2021 IEEE Journal of Microwaves  
INDEX TERMS Beamforming, interference suppression, multibeam antenna, orthogonality, wireless systems, zero-forcing.  ...  Orthogonality in multibeam antennas is revisited. The difference between orthogonal beamforming and zero-forced beamforming is highlighted.  ...  In 1993, he became the Head of Electromagnetics Division, ESA. He is currently a part-time Scientific Advisor with the Technical University of Delft.  ... 
doi:10.1109/jmw.2021.3109244 fatcat:www5vwy3zzhxhmlcxjl755cj4i

Land mobile satellite communication system using the geostationary platform

1993 Journal of Spacecraft and Rockets  
The numbers in each zone represent the share of population (%)/the share of information quantity (%).  ...  Given a focal length of 1.1 times the aperture diameter and a relative between-adjacent-beam deviation angle of 0.468 deg, the aperture diameter becomes 171, [uhf (800 MHz): 43 m, L band: 25 m, S band:  ... 
doi:10.2514/3.11532 fatcat:ikw5xhwurnemtotzzx6yugcjb4

Satellite Payloads Pay Off

Shilong Pan, Dan Zhu, Shifeng Liu, Kun Xu, Yitang Dai, Tianliang Wang, Jianguo Liu, Ninghua Zhu, Yong Xue, Naijin Liu
2015 IEEE Microwave Magazine  
A schematic diagram of the system is shown in Figure 8 , consisting of a shared OFC generator, shared multifrequency RF source, a number of antenna elements connected to separated TTD modules, several  ...  Under the ultralow timing jitter and ultranarrow pulse of the MLL, aperture error and corresponding noise are steeply suppressed when sampling the input analog signal.  ... 
doi:10.1109/mmm.2015.2441619 fatcat:mlhlwiemdncvjcmsappk5dnak4

A N260 Band 64 Channel Millimeter Wave Fulldigital Multi-beam Array for 5G Massive MIMO Applications

Le Kuai, Jixin Chen, Zhi Hao Jiang, Chao Yu, Chong Guo, Yingrui Yu, Houxing Zhou, Wei Hong
2020 IEEE Access  
Simulation and measurement results suggest that the array has an excellent beam-forming capability that supports beam steering and generation of multiple concurrent beams.  ...  The OTA test reveals that the array can provide high modulation and demodulation accuracy for communication.  ...  To maintain the linearity of the modulated signal, an output power back-off of 10 dB is employed. Thus, each single transmitter module can offer a linear average power of 4 dBm.  ... 
doi:10.1109/access.2020.2978070 fatcat:tlwat2bbtva3djoa4c2v54wrgq

Cyclotron-resonance-maser arrays

E. Jerby, A. Kesar, M. Korol, L. Lei, V. Dikhtyar
1999 IEEE Transactions on Plasma Science  
These include a multimode analysis of a CRM-array, and a first operation of this device with five carbon-fiber cathodes.  ...  The implementation of the CRM-array approach may alleviate several technological difficulties which impede the development of singlebeam gyro-devices.  ...  studied 1-D CRM modules).  ... 
doi:10.1109/27.772272 fatcat:rtes26sc45gy5ch2hfy2e2iuzm

A novel method for archiving multibeam sonar data with emphasis on efficient record size reduction and storage

Marek Moszynski, Andrzej Chybicki, Marcin Kulawiak, Zbigniew Lubniewski
2013 Polish Maritime Research  
Unlike bathymetric sonars, which only capture the seafloor, multibeam systems produce very large amounts of data during surveys.  ...  Recently, modern multibeam echosounder systems (MBES) capable of recording backscatter data for the whole water column, not just for the seabed, have become available thus providing data allowing for visualization  ...  Acknowledgements Authors of the paper wish to thank Pawel Pocwiardowski, Ph.D. from RESON Inc. for the effort that he put into the presented research. BIBLIOGRAPHY  ... 
doi:10.2478/pomr-2013-0009 fatcat:3o5g7woyv5fa5eg5jmuw7dadnu

An overview of Design and Analysis techniques of Bootlace Lens for Multiple beamforming

G. S. Tomar, Ravi Kushwah
2009 International Journal of Engineering and Technology  
The basic design of microwave lens is Rotman lens and modifications have brought the new concept of bootlace lens due to its specific design and look as of open lenses of military boot.  ...  The parameters and methods, which are of importance in the design and analysis of the work, are compared and performance thereon is considered for practical approach and fabrication results of some of  ...  Phu et al [26] have developed a wide bandwidth electronic scanning antenna (ESA) which is based on a Rotman lens beam forming network with shared aperture.  ... 
doi:10.7763/ijet.2009.v1.75 fatcat:yyp5zjdvz5c6ncu4fd3ql2syia

Multibeam Dual-Circularly Polarized Reflectarray for Connected and Autonomous Vehicles

Qi Luo, Steven Gao, Wenting Li, Mohammed Sobhy, Ioanna Bakaimi, Ch Kees de Groot, Brian Hayden, Ian Reaney, Yang Xuexia
2019 IEEE Transactions on Vehicular Technology  
The developed reflectarray uses one aperture to realize dualband and multibeam operation. At each frequency band, there are two simultaneously shaped beams with different circular polarizations.  ...  This paper presents a multibeam dual-circularly polarized (CP) reflectarray for connected and autonomous vehicles.  ...  Meanwhile, the present design achieves the largest beam-scanning range with dual-CP radiation and low fabrication complexity. single-band; two apertures [28] No N.A 43 o linear direct radiating array  ... 
doi:10.1109/tvt.2019.2897218 fatcat:dqggnzhfjnellmavodyln26ava

A Comprehensive Study of Past, Present, and Future of Spectrum Sharing and Information Embedding Techniques in Joint Wireless Communication and Radar Systems

Muhammad Fahad Munir, Abdul Basit, Wasim Khan, Ahmad Saleem, AbdulRahman Al-salehi, Muhammad Inam Abbasi
2022 Wireless Communications and Mobile Computing  
without compromising the radar performance, this paper reviews the state-of-the-art developments in the spectrum shared between mobile communication and radars in terms of coexistence, collaboration,  ...  Compared to the existing surveys, we explore an open research issue on radar and mobile communication operating with mutual benefits based on collaboration in terms of spectrum sharing.  ...  Time Modulated Array-Based Method. Time modulated array or 4-dimension antenna array use predefined time sequence programmed at the transmitter to radiate beampattern [170] .  ... 
doi:10.1155/2022/9642849 fatcat:ojojnlkkzfeslaunciwpmul45a

Accelerated focused ultrasound imaging

B. Madore, P.J. White, K. Thomenius, G.T. Clement
2009 IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control  
One of the most, basic trade-offs in ultrasound imaging involves frame rate, depth, and number of lines.  ...  The proposed approach can also be extended to imaging strategies that do not involve transmit beamforming, such as synthetic aperture imaging.  ...  The content of this work is the sole responsibility of its authors.  ... 
doi:10.1109/tuffc.2009.1352 pmid:20040398 pmcid:PMC2813841 fatcat:txszxudawnevxgtyi7jzo6n5yi
« Previous Showing results 1 — 15 out of 353 results