Pub Date : 2016-12-01DOI: 10.1109/APSYM.2016.7929148
P. P.Sathish, D. K. Reddy, A. D. Sarma
The positional accuracy of navigation receiver is an important factor for various applications. Based on the application, the achieved positional accuracy levels vary from meters to millimeters. IRNSS-GPS-SBAS (IGS) receiver is capable of receiving all the seven IRNSS satellite signals in L5 (1176.45MHz) and S1 (2492.028MHz) band in addition to twelve GPS satellite signals and two SBAS (GAGAN) satellite signals in L1 (1575.42 MHz) frequency band. In this paper the position accuracy is evaluated in terms of 2DRMS, 3DRMS CEP, SEP, Geometric Dilution of Precision (GDOP) and Doppler shift in various modes namely Hybrid (IRNSS L5 and GPS L1), IRNSS dual frequency (L5 and S1), IRNSS L5 only and IRNSS S1 only mode. In Hybrid mode, it is found that all the positional accuracy values are better than the corresponding other mode values.
{"title":"Preliminary performance evaluation of IRNSS-GPS-SBAS receiver in terms of position accuracy and velocity","authors":"P. P.Sathish, D. K. Reddy, A. D. Sarma","doi":"10.1109/APSYM.2016.7929148","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929148","url":null,"abstract":"The positional accuracy of navigation receiver is an important factor for various applications. Based on the application, the achieved positional accuracy levels vary from meters to millimeters. IRNSS-GPS-SBAS (IGS) receiver is capable of receiving all the seven IRNSS satellite signals in L5 (1176.45MHz) and S1 (2492.028MHz) band in addition to twelve GPS satellite signals and two SBAS (GAGAN) satellite signals in L1 (1575.42 MHz) frequency band. In this paper the position accuracy is evaluated in terms of 2DRMS, 3DRMS CEP, SEP, Geometric Dilution of Precision (GDOP) and Doppler shift in various modes namely Hybrid (IRNSS L5 and GPS L1), IRNSS dual frequency (L5 and S1), IRNSS L5 only and IRNSS S1 only mode. In Hybrid mode, it is found that all the positional accuracy values are better than the corresponding other mode values.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115646153","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 : 2016-12-01DOI: 10.1109/APSYM.2016.7929149
P. Das, S. Ray
Non Destructive Testing (NDT) technique using microwave is one of the most challenging areas for researchers. In the present paper, various type of open-ended waveguide sensor using transmission mode has been studied for detection of slotted discontinuity in a metallic plate. The study has been carried out in X-Band where the size of discontinuity is comparable with the dimension of open end of wave guide. The studied techniques provide better resolution with compared to other reported results.
{"title":"NDT using open-ended waveguides","authors":"P. Das, S. Ray","doi":"10.1109/APSYM.2016.7929149","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929149","url":null,"abstract":"Non Destructive Testing (NDT) technique using microwave is one of the most challenging areas for researchers. In the present paper, various type of open-ended waveguide sensor using transmission mode has been studied for detection of slotted discontinuity in a metallic plate. The study has been carried out in X-Band where the size of discontinuity is comparable with the dimension of open end of wave guide. The studied techniques provide better resolution with compared to other reported results.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124417814","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 : 2016-12-01DOI: 10.1109/APSYM.2016.7929151
Neethu P.S., A. B. Subhalakshmy, R. U. Nair, Hema Singh
Radar Cross Section (RCS) essentially relates to low-observable technology. Most of the aerospace structures are close to cylindrical shape. The scattering problems often involve objects that are quite large in terms of wavelength, hence the matrix equations obtained using numerical methods such as Method of Moments (MoM) are large in size and computationally complex. In this paper, RCS of circular, elliptic and semi elliptic dielectric cylinder is computed using MoM. In order to reduce computational cost, conjugate gradient-based accelerating algorithm is employed. It is shown that the computational time is reduced significantly when accelerating algorithm is incorporated into RCS computations.
{"title":"MoM-CG based approach for RCS analysis of cylindrical structures","authors":"Neethu P.S., A. B. Subhalakshmy, R. U. Nair, Hema Singh","doi":"10.1109/APSYM.2016.7929151","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929151","url":null,"abstract":"Radar Cross Section (RCS) essentially relates to low-observable technology. Most of the aerospace structures are close to cylindrical shape. The scattering problems often involve objects that are quite large in terms of wavelength, hence the matrix equations obtained using numerical methods such as Method of Moments (MoM) are large in size and computationally complex. In this paper, RCS of circular, elliptic and semi elliptic dielectric cylinder is computed using MoM. In order to reduce computational cost, conjugate gradient-based accelerating algorithm is employed. It is shown that the computational time is reduced significantly when accelerating algorithm is incorporated into RCS computations.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131378590","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 : 2016-12-01DOI: 10.1109/APSYM.2016.7929154
V. Lingasamy, K. Selvan, S. Rengarajan
In reflectarray design, computation of the reflection phase of unit cells is of prime importance. In this paper, a theoretical method to calculate the reflection phase of circular patches is reported. This is done by adapting an already published work for rectangular patch elements. The estimated reflection phases for circular patches in X band are compared with simulated values for substrates of varying thickness and dielectric constant. The comparison leads to the understanding that the method works satisfactorily for thin substrates with any dielectric constant and for moderately thick substrates with high dielectric constant. This observation is, of course, consistent with that made for the rectangular patch.
{"title":"On the reflection phase characteristics of rectangular and circular patch reflectarray elements","authors":"V. Lingasamy, K. Selvan, S. Rengarajan","doi":"10.1109/APSYM.2016.7929154","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929154","url":null,"abstract":"In reflectarray design, computation of the reflection phase of unit cells is of prime importance. In this paper, a theoretical method to calculate the reflection phase of circular patches is reported. This is done by adapting an already published work for rectangular patch elements. The estimated reflection phases for circular patches in X band are compared with simulated values for substrates of varying thickness and dielectric constant. The comparison leads to the understanding that the method works satisfactorily for thin substrates with any dielectric constant and for moderately thick substrates with high dielectric constant. This observation is, of course, consistent with that made for the rectangular patch.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117330985","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 : 2016-12-01DOI: 10.1109/APSYM.2016.7929150
A. Jyothi, C. Saha, B. Ghosh, R. Kini, C. Vaisakh
This paper presents design of a high gain conventional bow-tie photoconductive antenna in the THz frequency band. Simulation results of the proposed antenna are presented in this paper. The paper also deals with the effect of silicon lens on the antenna radiation pattern which enhances the directivity of the antenna by a considerable amount.
{"title":"Design of a gain enhanced THz bow-tie photoconductive antenna","authors":"A. Jyothi, C. Saha, B. Ghosh, R. Kini, C. Vaisakh","doi":"10.1109/APSYM.2016.7929150","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929150","url":null,"abstract":"This paper presents design of a high gain conventional bow-tie photoconductive antenna in the THz frequency band. Simulation results of the proposed antenna are presented in this paper. The paper also deals with the effect of silicon lens on the antenna radiation pattern which enhances the directivity of the antenna by a considerable amount.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125460291","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 : 2016-12-01DOI: 10.1109/APSYM.2016.7929157
K. S. Beenamole, Sreejith C.A, Gowri Shankar
This paper presents the studies conducted on conformal antennas placed on cylindrical curved surfaces. The radiation patterns for 4,8,16 and 32 element conformal arrays have been studied for omnidirectional applications. 8 element arrays have been studied for different spacing's and for different curvatures. The phase compensation on conformal arrays are also studied and the results are presented. An 8 element conformal antenna array with phase compensation has been fabricated using inset fed microstrip patch elements and the results are also presented.
{"title":"Studies on conformal antenna arrays placed on cylindrical curved surfaces","authors":"K. S. Beenamole, Sreejith C.A, Gowri Shankar","doi":"10.1109/APSYM.2016.7929157","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929157","url":null,"abstract":"This paper presents the studies conducted on conformal antennas placed on cylindrical curved surfaces. The radiation patterns for 4,8,16 and 32 element conformal arrays have been studied for omnidirectional applications. 8 element arrays have been studied for different spacing's and for different curvatures. The phase compensation on conformal arrays are also studied and the results are presented. An 8 element conformal antenna array with phase compensation has been fabricated using inset fed microstrip patch elements and the results are also presented.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131614223","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 : 2016-12-01DOI: 10.1109/APSYM.2016.7929139
G. B. Reddy, D. Sriram Kumar
In this paper coaxial probe fed rectangular Dielectric resonator antenna (DRA) is presented. A cylindrical conductor pin in inserted in to DRA to bring the additional resonance. The impedance Bandwidth (<-10 dB) of 40% was achieved by optimizing the feed location and conductor pin length. And modes were are also identified for corresponding resonances. Probe monopole resonance, TM122 mode of DRA and loaded Pin resonances are made to couple to achieve the impedance matching over a wide bandwidth. The radiation characteristics of the antenna are also explained.
{"title":"A cylindrical pin loaded rectangular DRA for wideband applications","authors":"G. B. Reddy, D. Sriram Kumar","doi":"10.1109/APSYM.2016.7929139","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929139","url":null,"abstract":"In this paper coaxial probe fed rectangular Dielectric resonator antenna (DRA) is presented. A cylindrical conductor pin in inserted in to DRA to bring the additional resonance. The impedance Bandwidth (<-10 dB) of 40% was achieved by optimizing the feed location and conductor pin length. And modes were are also identified for corresponding resonances. Probe monopole resonance, TM122 mode of DRA and loaded Pin resonances are made to couple to achieve the impedance matching over a wide bandwidth. The radiation characteristics of the antenna are also explained.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130006443","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 : 2016-12-01DOI: 10.1109/APSYM.2016.7929140
L. Christie, G. Erabati
TWT is one of the fundamental components in a Radar Transmitter and compared to Helix TWT, Coupled Cavity TWT (CCTWT) gives the highest power over a moderate bandwidth. A complete simulation of the TWT is very useful in avoiding iterations and failures in TWT development cycle. In this paper, the CCTWT designed in the X-band frequency range, has been simulated using the Eigen mode solver and the particle-in-cell solver of the three-dimensional software package, CST Microwave Studio. The slow wave structure along with the couplers is designed initially with the equivalent circuit approach and later optimized using the Eigen mode solver of CST MWS. The initial estimate of the total number of cavities and the number of cavities per section was obtained using large signal analysis which was later optimized using Particle-in-cell Solver of CST MWS. The Simulation predicted an output power of around 1 kW and 27 cavities.
{"title":"Particle-in-cell simulations of CC-TWT for radar transmitters","authors":"L. Christie, G. Erabati","doi":"10.1109/APSYM.2016.7929140","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929140","url":null,"abstract":"TWT is one of the fundamental components in a Radar Transmitter and compared to Helix TWT, Coupled Cavity TWT (CCTWT) gives the highest power over a moderate bandwidth. A complete simulation of the TWT is very useful in avoiding iterations and failures in TWT development cycle. In this paper, the CCTWT designed in the X-band frequency range, has been simulated using the Eigen mode solver and the particle-in-cell solver of the three-dimensional software package, CST Microwave Studio. The slow wave structure along with the couplers is designed initially with the equivalent circuit approach and later optimized using the Eigen mode solver of CST MWS. The initial estimate of the total number of cavities and the number of cavities per section was obtained using large signal analysis which was later optimized using Particle-in-cell Solver of CST MWS. The Simulation predicted an output power of around 1 kW and 27 cavities.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122127763","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 : 2016-12-01DOI: 10.1109/APSYM.2016.7929147
Gupta Jay Vishnu, Grishma Jani, D. Pujara
This paper presents the development of the Adaptive Neuro-Fuzzy Inference System (ANFIS) based CAD tool for designing an axially corrugated horn antenna, which has proved its dominance as a feed for the applications where small aperture antennas are being considered. In this paper, the design and optimization of a Ku-band compact corrugated horn antenna is demonstrated using the ANFIS technique. The performance in terms of radiation pattern, peak gain and return loss of a horn designed using the ANFIS algorithm is compared with that of a horn designed using the commercially available antenna design software. The results of the horn designed by ANFIS were found accurate and attained within a short processing time and with limited computational resources as compared to the conventional horn design techniques.
{"title":"Design and optimization of a Ku-band compact axial corrugated horn antenna using ANFIS","authors":"Gupta Jay Vishnu, Grishma Jani, D. Pujara","doi":"10.1109/APSYM.2016.7929147","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929147","url":null,"abstract":"This paper presents the development of the Adaptive Neuro-Fuzzy Inference System (ANFIS) based CAD tool for designing an axially corrugated horn antenna, which has proved its dominance as a feed for the applications where small aperture antennas are being considered. In this paper, the design and optimization of a Ku-band compact corrugated horn antenna is demonstrated using the ANFIS technique. The performance in terms of radiation pattern, peak gain and return loss of a horn designed using the ANFIS algorithm is compared with that of a horn designed using the commercially available antenna design software. The results of the horn designed by ANFIS were found accurate and attained within a short processing time and with limited computational resources as compared to the conventional horn design techniques.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117277168","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 : 2016-12-01DOI: 10.1109/APSYM.2016.7929141
M. Kulkarni, A. Cheeran, K. P. Ray, S. Kakatkar
Two coplanar waveguide (CPW) low pass filter configurations based on rectangular dumbbell shaped Symmetric-DGS (SDGS) and Asymmetric-DGS (ADGS) have been designed and fabricated. For the designed filters, the equivalent RLC parameters have been extracted. Performance assessment of these filters has been carried out based on various parameters like, cut-off frequency, pass-band width, pass-band insertion loss, attenuation at resonant frequency, etc. The fabricated CPW-ADGS filter shows pass-band width of 0.9 GHz with attenuation at resonant frequency of -23 dB. IE3D simulation results and theoretical results show good agreement with measured results.
{"title":"Design of a novel CPW filter using asymmetric DGS","authors":"M. Kulkarni, A. Cheeran, K. P. Ray, S. Kakatkar","doi":"10.1109/APSYM.2016.7929141","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929141","url":null,"abstract":"Two coplanar waveguide (CPW) low pass filter configurations based on rectangular dumbbell shaped Symmetric-DGS (SDGS) and Asymmetric-DGS (ADGS) have been designed and fabricated. For the designed filters, the equivalent RLC parameters have been extracted. Performance assessment of these filters has been carried out based on various parameters like, cut-off frequency, pass-band width, pass-band insertion loss, attenuation at resonant frequency, etc. The fabricated CPW-ADGS filter shows pass-band width of 0.9 GHz with attenuation at resonant frequency of -23 dB. IE3D simulation results and theoretical results show good agreement with measured results.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115211942","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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