{"title":"Experiment on TWT 3IM suppression using harmonic and IM3 injection","authors":"Li Li, Jinjun Feng, Shaolun Cai, Xiaofeng Liang","doi":"10.1109/IVELEC.2008.4556474","DOIUrl":null,"url":null,"abstract":"In this paper, both second harmonic and third order inter-modulation signals are experimentally injected into a traveling wave tube (TWT) to carry out the research on the suppression of IM3 in a X-band TWT. The results shows that with proper phase and amplitude of injected 2f<sub>2</sub> and 2f<sub>2</sub> - f<sub>1</sub>, a significant reduction in the upper IM3 (2f<sub>2</sub> - f<sub>1</sub>) is observed. IM3 suppression of up to 30.67 dB is examined with 2f<sub>2</sub> injection when Df = f<sub>1</sub>- f<sub>2</sub> = 5MHz, and 15.75 dB IM3 suppression is obtained with IM3 (2f<sub>2</sub> - f<sub>1</sub>) injection.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"62 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2008 IEEE International Vacuum Electronics Conference","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/IVELEC.2008.4556474","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6
Abstract
In this paper, both second harmonic and third order inter-modulation signals are experimentally injected into a traveling wave tube (TWT) to carry out the research on the suppression of IM3 in a X-band TWT. The results shows that with proper phase and amplitude of injected 2f2 and 2f2 - f1, a significant reduction in the upper IM3 (2f2 - f1) is observed. IM3 suppression of up to 30.67 dB is examined with 2f2 injection when Df = f1- f2 = 5MHz, and 15.75 dB IM3 suppression is obtained with IM3 (2f2 - f1) injection.
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