Pub Date : 2015-08-01DOI: 10.1109/QIR.2015.7374912
C. E. Santosa, A. Munir
This paper deals with the development of conformal traveling wave active antenna based on interdigital capacitor structure for 2.35MHz communication between an experimental rocket and the ground station. The proposed active antenna which has the dimension of 238.64mm × 45mm consists of 7 blocks of interdigital capacitor structure as antenna radiators connected with 6 pairs of RF amplifier as active components. All the components of active antenna are deployed on an RT/Duroid® 6010LM dielectric substrate with the thickness of 0.127mm. The use of very thin dielectric substrate for antenna realization is aimed to have a conformable antenna which fits the cylindrical body of experimental rocket. After obtaining the optimum performance design, the proposed active antenna is then realized through wet etching technique for experimental characterization. As comparison, a conformal traveling wave passive antenna is simultaneously developed and realized on the same dielectric substrate with the dimension of of 238.64mm × 22mm. From the characterization result, it shows that the realized active antenna resonates at center frequency of 2.3625GHz with gain of -16.648dBi. This result is slightly different with the realized passive antenna which resonates at center frequency of 2.375GHz with gain of -18.763dBi.
{"title":"Interdigital capacitor structure-based conformal traveling wave active antenna for experimental rocket communication","authors":"C. E. Santosa, A. Munir","doi":"10.1109/QIR.2015.7374912","DOIUrl":"https://doi.org/10.1109/QIR.2015.7374912","url":null,"abstract":"This paper deals with the development of conformal traveling wave active antenna based on interdigital capacitor structure for 2.35MHz communication between an experimental rocket and the ground station. The proposed active antenna which has the dimension of 238.64mm × 45mm consists of 7 blocks of interdigital capacitor structure as antenna radiators connected with 6 pairs of RF amplifier as active components. All the components of active antenna are deployed on an RT/Duroid® 6010LM dielectric substrate with the thickness of 0.127mm. The use of very thin dielectric substrate for antenna realization is aimed to have a conformable antenna which fits the cylindrical body of experimental rocket. After obtaining the optimum performance design, the proposed active antenna is then realized through wet etching technique for experimental characterization. As comparison, a conformal traveling wave passive antenna is simultaneously developed and realized on the same dielectric substrate with the dimension of of 238.64mm × 22mm. From the characterization result, it shows that the realized active antenna resonates at center frequency of 2.3625GHz with gain of -16.648dBi. This result is slightly different with the realized passive antenna which resonates at center frequency of 2.375GHz with gain of -18.763dBi.","PeriodicalId":127270,"journal":{"name":"2015 International Conference on Quality in Research (QiR)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122623191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-01DOI: 10.1109/QIR.2015.7374911
R. D. Mayasari, R. Nuryadi, E. Suharyadi, K. Abraha
An effect of external magnetic field on surface plasmon resonance (SPR) phenomenon has been studied using cobalt ferrite nanoparticles on silver-Kretschmann configuration. The cobalt ferrite (CoFe2O4) nanoparticles with the size of about 4 nanometers were synthesized by a coprecipitation method. The SPR system was applied by an external magnetic field in various directions to monitor the change of SPR phenomenon. The attenuated total reflection (ATR) curve shows that the SPR angle shifts to different directions depending on the external magnetic field direction. The SPR angle shift may be caused by the superparamagnetic property of cobalt ferrite nanoparticles. The magnetic moment of cobalt ferrite has free movement in single domain of nanoparticles and can be controlled by the external magnetic field. The direction of magnetic moment changes homogenously following the external magnetic field and it probably influences the refractive index of cobalt ferrite nanoparticles.
{"title":"The effect of external magnetic field on the SPR phenomenon in modified Kretschmann configuration using magnetic cobalt ferrite nanoparticles","authors":"R. D. Mayasari, R. Nuryadi, E. Suharyadi, K. Abraha","doi":"10.1109/QIR.2015.7374911","DOIUrl":"https://doi.org/10.1109/QIR.2015.7374911","url":null,"abstract":"An effect of external magnetic field on surface plasmon resonance (SPR) phenomenon has been studied using cobalt ferrite nanoparticles on silver-Kretschmann configuration. The cobalt ferrite (CoFe2O4) nanoparticles with the size of about 4 nanometers were synthesized by a coprecipitation method. The SPR system was applied by an external magnetic field in various directions to monitor the change of SPR phenomenon. The attenuated total reflection (ATR) curve shows that the SPR angle shifts to different directions depending on the external magnetic field direction. The SPR angle shift may be caused by the superparamagnetic property of cobalt ferrite nanoparticles. The magnetic moment of cobalt ferrite has free movement in single domain of nanoparticles and can be controlled by the external magnetic field. The direction of magnetic moment changes homogenously following the external magnetic field and it probably influences the refractive index of cobalt ferrite nanoparticles.","PeriodicalId":127270,"journal":{"name":"2015 International Conference on Quality in Research (QiR)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114956325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-01DOI: 10.1109/QIR.2015.7374920
Oey Endra, D. Gunawan
The synthesis sparse representation model of signals regards that signal is formed from linear combination of a few atoms from a synthesis dictionary. Compressive sensing (CS) as a novel technique to acquire the signal directly in already compressed is based on that model. The analysis sparse representation as alternative model for the signals began to gain attention in recent years. The sparse analysis coefficients are obtained in analysis model by multiplying analysis dictionary and the signal. In this paper, we compare the performance of synthesis-based and analysis-based CS system. The simulation results show that analyisis-based CS provides better performance than synthesis-based CS in terms of signal recovery accuracy. It suggests that the analyis model will play an important role in the future direction of the CS research.
{"title":"Comparison of synthesis-based and analysis-based compressive sensing","authors":"Oey Endra, D. Gunawan","doi":"10.1109/QIR.2015.7374920","DOIUrl":"https://doi.org/10.1109/QIR.2015.7374920","url":null,"abstract":"The synthesis sparse representation model of signals regards that signal is formed from linear combination of a few atoms from a synthesis dictionary. Compressive sensing (CS) as a novel technique to acquire the signal directly in already compressed is based on that model. The analysis sparse representation as alternative model for the signals began to gain attention in recent years. The sparse analysis coefficients are obtained in analysis model by multiplying analysis dictionary and the signal. In this paper, we compare the performance of synthesis-based and analysis-based CS system. The simulation results show that analyisis-based CS provides better performance than synthesis-based CS in terms of signal recovery accuracy. It suggests that the analyis model will play an important role in the future direction of the CS research.","PeriodicalId":127270,"journal":{"name":"2015 International Conference on Quality in Research (QiR)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121610656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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