Journal ArticleDOI
Design of Lumped-Component Programmable Delay Elements for Ultra-Wideband Beamforming
Naga Rajesh,Shanthi Pavan +1 more
TLDR
A ladder filter-based programmable time-delay element for beamforming in ultra-wideband (UWB) systems and a lumped-element realization becomes possible by approximating e-std as a ratio of polynomials (based on Taylor and Padé expansions).Abstract:
We introduce a ladder filter-based programmable time-delay element for beamforming in ultra-wideband (UWB) systems. Such a lumped-element realization becomes possible by approximating e
-std
as a ratio of polynomials (based on Taylor and Pade expansions). When compared with conventional methods based on the tapped delay-line architecture, the proposed technique achieves lower power dissipation, higher delay range and resolution, and better area efficiency. A prototype delay line designed for the 3.1-10.6 GHz UWB range achieves a delay range of 140 ps and a gain range of -30 dB to +10 dB. Fabricated in a 0.25 μm SiGe BiCMOS process, the delay element occupies an active area of 1 mm
2
and consumes 53 mW from a 2.5 V supply. A four-antenna beamforming system using the delay element can achieve a scanning range of ±61
°
with 0.86 °
resolution for an antenna spacing of 15 mm.read more
Citations
More filters
Journal ArticleDOI
A 2-GHz Bandwidth, 0.25–1.7 ns True-Time-Delay Element Using a Variable-Order All-Pass Filter Architecture in 0.13 $\mu$ m CMOS
Imon Mondal,Nagendra Krishnapura +1 more
TL;DR: An all-pass filter architecture that can be generalized to high orders, and can be realized using active circuits is proposed, and a compact true-time-delay element with a widely tunable delay and a large delay-bandwidth product (DBW) is demonstrated.
Proceedings Article
CMOS distributed active power combiners and splitters for multi-antenna UWB beamforming transceivers
TL;DR: This paper presents the design of the first CMOS distributed active power combiners and splitters with wideband variable delay and gain, which are the key components for use in multi-antenna (MA) ultra-wideband (UWB) point-to-point beamforming communication systems with multiple transmit and receive antennas.
Proceedings ArticleDOI
A True Time Delay-based SiGe Bi-directional T/R Chipset for Large-Scale Wideband Timed Array Antennas
TL;DR: In this article, a true time delay (TTD)-based transmit/receive (T /R) chipset with 508 ps time delay and 31.5 dB amplitude control for large-scale wideband timed array is presented.
Journal ArticleDOI
True-Time-Delay Beamforming Receiver With RF Re-Sampling
TL;DR: This work proposes a true-time-delay beamforming receiver architecture which enables squint-free wideband spatial filtering prior to the A/D conversion, and achieves a squints-free beamforming for a 400 MHz RF bandwidth, and a maximum beamforming delay of three carrier time periods.
References
More filters
Journal ArticleDOI
Distributed MEMS true-time delay phase shifters and wide-band switches
S. Barker,Gabriel M. Rebeiz +1 more
TL;DR: In this paper, a coplanar waveguide (CPW) transmission line with fixed-fixed beam MEMS bridge capacitors placed periodically over the transmission line, thus creating a slow-wave structure was designed.
Proceedings ArticleDOI
On the spectral and power requirements for ultra-wideband transmission
TL;DR: A new pulse shape is presented that satisfies the FCC spectral mask and it is shown that UWB can be a good candidate for reliably transmitting 100 Mbps over distances at about 10 meters.
Journal ArticleDOI
A DC-to-40 GHz four-bit RF MEMS true-time delay network
TL;DR: A monolithic true-time delay (TTD) network containing sixteen metal-to-metal contact RF microelectromechanical systems (MEMS) switches has been successfully fabricated and characterized.
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