NDLI: Wideband RF beamforming: the Rotman lens vs. photonic beamforming

Content Provider	IEEE Xplore Digital Library
Author	Rotman, R. Rotman, S. Rotman, W. Raz, O. Tur, M.
Copyright Year	2005
Description	Author affiliation: Fac. of Eng., Tel Aviv Univ., Israel (Rotman, R.)
Abstract	The discovery of the Rotman lens (Rotman, W. and Turner, R.F., 1963) was an enabling technology that greatly increased the capabilities of multibeam antennas. The original intent of the inventor (WR) was somewhat less ambitious. He wanted to study various interesting configurations of TTD (true time delay) beamforming, and has been somewhat amazed and fascinated to see the evolution of his original idea into its present forms. The paper compares a relatively new TTD technology which, in the near future, for certain usages, may supersede or supplement the Rotman lens - all with the guidance and the blessing of Walt Rotman. Wideband RF phased array beamformers have increasingly stringent requirements as to their performance, given the desire to detect and classify targets with increasing accuracy, and to eliminate false alarms caused by clutter. Instantaneous bandwidths are growing accordingly. Traditional error analyses of phased arrays, which concentrated on spatial patterns, must be supplemented to take into account also pulse distortion created by the transfer function of the beamformer. While these phenomena have been well known for UWB antennas, they have rarely been analyzed for large phased arrays with highly complex feed networks. The paper provides a method to analyze the performance of TTD beamformers and, as an example, shows measured results of a novel photonic beamformer in transmission with a comparison to the traditional Rotman lens.
Starting Page	23
Ending Page	26
File Size	716302
Page Count	4
File Format	PDF
ISBN	0780388836
DOI	10.1109/APS.2005.1551925
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-07-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Wideband Radio frequency Lenses Phased arrays Delay effects Paper technology Phase detection Bandwidth Error analysis
Content Type	Text
Resource Type	Article

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