NDLI: Single-Sideband Time-Modulated Phased Array

Content Provider	IEEE Xplore Digital Library
Author	A-Min Yao Wen Wu Da-Gang Fang
Copyright Year	1963
Abstract	A new in-phase/quadrature (I/Q) complex modulation technique to realize single-sideband time-modulated phase only weighting on an array antenna is proposed. Based on modulating rectangular pulses and trapezoidal pulses, the theories of generating a scanning beam at the single positive sideband are presented. It was found that using trapezoidal pulse modulation can obtain excellent performance in power efficiency and undesired sideband level than using rectangular pulse modulation. Unlike conventional time-modulated antenna array where each array element is connected to a RF switch, in the proposed scheme, each element is connected to an I/Q channel modulator which is composed of two Wilkinson power dividers, two RF switches, two 0/π phase shifters in RF channels, and one π/2 fixed-phase shifter in the control circuit. By properly controlling both the phase shifters and the switches in time domain, the single-sideband modulation can be realized with the uniform amplitude and variable phase in frequency domain. The I/Q modulator acts as a phase shifter and can be used to form a phased array. In this paper, the main efforts have been paid to find the pulse sequences to suppress the spurious bands. To validate the proposed technique, simulated results of an eight-element single-sideband time-modulated linear array obtained from the array factor and full-wave analysis are reported. In the case of using rectangular pulses, the power efficiency of the scanning beam is 91.47% and the peak level of the highest undesired harmonic is -13.98 dB. In the case of using trapezoidal pulses, the best values can reach 99.79% and -27.98 dB.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	1957
Ending Page	1968
Page Count	12
File Size	1503990
File Format	PDF
ISSN	0018926X
Volume Number	63
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Arrays Switches Harmonic analysis Amplitude modulation Phase shifters Phase modulation Radio frequency time-modulation technique In-phase/quadrature complex modulation single-sideband time-modulated phase-only weighting phased array time-modulation (TM) technique In-phase/quadrature (I/Q) complex modulation
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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