Effect of Pulse-Shifting on Calculating Sideband Power Losses in Non-uniform Time-Modulated Array

IF 0.6 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Electromagnetics Pub Date : 2023-10-01 DOI:10.1080/02726343.2023.2257524

Sujoy Mandal, Sujit Kumar Mandal

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Abstract

ABSTRACTIn nonuniform time-modulated array (NTMA), despite modulating the antenna elements with nonidentical modulation frequencies, some harmonics may overlap in space at a particular frequency. In this paper, considering the overlapping and nonoverlapping nature of the radiated harmonics, the mathematical formulations for calculating the total sideband power (PSR) loss of nondegenerate NTMA (ND-NTMA) and degenerate NTMA (D-NTMA) using pulse shifting strategy are presented. Employing the derived closed-form expressions, the effect of shifting the pulse position on PSR is studied. It is investigated that, though the PSR of ND-NTMA does not depend on the shifted pulse position, for D-NTMA, it depends on the intersected switching time duration of the pulses. Through representative numerical results, it is shown that the derived expression is useful to accurately calculate the total sideband power of NTMA with pulse-shifting strategy.KEYWORDS: Harmonic powernon-uniform period modulationpulse-shiftingsideband radiation (SR)time-modulated array AcknowledgmentsThis work is financially supported by Ministry of Electronics and Information Technology (MeitY), Govt. of India under Visvesvaraya Young Faculty Fellowship of Visvesvaraya Ph.D. scheme (Grant No. PhD-MLA-4(29)/2015-16) and the work is under DST-SERB project Ref. file number EEQ/2016/00836, dated January 17, 2017.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the DST-SERB [EEQ/2016/00836, dated January 17, 2017]; Ministry of Electronics and Information Technology [PhD-MLA-4(29)/ 2015-16].

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脉冲移位对非均匀时调阵列边带功率损耗计算的影响

摘要在非均匀时调阵列(NTMA)中，尽管用不同的调制频率调制天线单元，但某些谐波在空间上可能在特定频率处重叠。考虑到辐射谐波的重叠和非重叠特性，给出了利用脉冲移位策略计算非简并NTMA (ND-NTMA)和简并NTMA (D-NTMA)总边带功率(PSR)损失的数学公式。利用导出的封闭表达式，研究了脉冲位置移位对PSR的影响。研究了ND-NTMA的PSR虽然不依赖于移位的脉冲位置，但它取决于脉冲的相交开关时间。通过具有代表性的数值计算结果表明，所推导的表达式能够准确地计算出采用脉冲移位策略的NTMA总边带功率。关键词:谐波功率;非均匀周期调制;脉冲移边带辐射(SR)时调制阵列。PhD-MLA-4(29)/2015-16)，工作归属于DST-SERB项目，参考文件号EEQ/2016/00836，日期为2017年1月17日。披露声明作者未报告潜在的利益冲突。本研究得到了DST-SERB [EEQ/2016/00836，日期为2017年1月17日]的支持;电子信息技术部[PhD-MLA-4(29)/ 2015-16]。

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来源期刊

Electromagnetics 工程技术-工程：电子与电气

CiteScore

1.60

自引率

12.50%

发文量

审稿时长

6 months

期刊介绍： Publishing eight times per year, Electromagnetics offers refereed papers that span the entire broad field of electromagnetics and serves as an exceptional reference source of permanent archival value. Included in this wide ranging scope of materials are developments in electromagnetic theory, high frequency techniques, antennas and randomes, arrays, numerical techniques, scattering and diffraction, materials, and printed circuits. The journal also serves as a forum for deliberations on innovations in the field. Additionally, special issues give more in-depth coverage to topics of immediate importance. All submitted manuscripts are subject to initial appraisal by the Editor, and, if found suitable for further consideration, to peer review by independent, anonymous expert referees. Submissions can be made via email or postal mail.