1.True-Time-Delay (TTD) is the main technology for phased array antennas (PAAs) beamforming applications.实时延(TTD)技术是现代相控阵天线(PAAs)中的关键技术。 2)time-to-death致命时间 TTD 3)real-time delay实时延迟 1.A scheme of real-time delay system for wideband phased array antenna is prop...
programmable true-time-delayfiber opticpiezo fiber stretcherhigh-bandwidth free-space laser communicationplanar beam steering apertureWe report our first experimental demonstration of an all-fiber true-time-delay (TTD) system integrated into our free-space laser-communication laboratory breadboard. Using ...
This article reviews the strengths and weaknesses of two electronic beamforming techniques: phase shifters (PSs) and true time delays (TTDs). It argues that these two methods can be combined in a hybr
A CMOS true-time delay (TTD) circuit operating from 15 to 40 GHz is presented for integrated UWB multi-antenna systems. The TTD circuit employs a distributed active switching structure in which eight cascode switches are distributed along transmission lines, leading to 3-bit variations of the gro...
We demonstrate a 7-bit photonic true-time-delay (TTD) system which uses an 8×8 micro-optical-electromechanical system (MOEMS) optical switch for phased array antennas (PAAs) beamforming applications. The switch controls the optical signal to pass by the fiber delay lines (FDLs) of different...
We present a novel and efficient approach to true-time-delay (TTD) beamforming for large adaptive phased arrays with N elements, for application in radar, sonar, and communication. This broadband and efficient adaptive method for time-delay array processing algorithm decreases the number of tapped...
Highly Dispersive Photonic Crystal Fibers for Optical True Time Delay (TTD) Based X-Band Phased Array Antenna.Phased array antenna (PAA) is a key ... H Subbaraman - The University of Texas at Austin. 被引量: 0发表: 2009年 Continuously variable true time-delay optical feeder for phased-arr...
A fully integrated 2-channel Ka-band True Time Delay (TTD) phase shifter with 12ps continuous changing delay time has been realized in a 0.25μm SiGe:C BiCMOS technology. A delay variation cancellation technique is proposed, resulting in less than 0.8ps delay variation over a 20-40GHz freque...
This OSSB modulation used in true time delay (TTD) can form digital TTD and overcome the power penalty. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1492–1494, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22436Zhigang Liu...
Wideband millimeter-wave and terahertz (THz) systems can facilitate simultaneous data communication with multiple spatially separated users. It is desirable to orthogonalize users across sub-bands by deploying frequency-dependent beams with a sub-band-specific spatial response. True-Time-Delay (TTD) ant...