Pub Date : 2016-12-01DOI: 10.1109/APSYM.2016.7929156
S. Roy, N. M., C. Saha
This article demonstrates an alternative way of controllable resistive loading in microstrip patch antenna in order to increase its bandwidth. As microstrip patch antenna is a high Q structure, thereby narrow bandwidth, resistive loading (introducing lossy lumped element inside the antenna structure) is considered as potential technique for improving bandwidth. Instead of conventional resistive loading i.e placing resistance of desired value across the substrate an alternative technique of resistive loading is proposed. Here resistances are connected across the slots of microstrip patch antenna. This method of resistive loading is easy and controllable. Resistive loading is performed on a dual slot rectangular microstrip patch antenna. Behavior of the loaded structure for different resistance values and different slot positions has been studied. A significant improvement in the bandwidth of slotted microstrip patch antenna has been achieved at the expense of gain. This antenna is designed to operate in the frequency range of (2.4/2.5GHz) which partially covers WiFi and WiMax frequency range.
{"title":"Resistively loaded slotted microstrip patch antenna with controllable bandwidth","authors":"S. Roy, N. M., C. Saha","doi":"10.1109/APSYM.2016.7929156","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929156","url":null,"abstract":"This article demonstrates an alternative way of controllable resistive loading in microstrip patch antenna in order to increase its bandwidth. As microstrip patch antenna is a high Q structure, thereby narrow bandwidth, resistive loading (introducing lossy lumped element inside the antenna structure) is considered as potential technique for improving bandwidth. Instead of conventional resistive loading i.e placing resistance of desired value across the substrate an alternative technique of resistive loading is proposed. Here resistances are connected across the slots of microstrip patch antenna. This method of resistive loading is easy and controllable. Resistive loading is performed on a dual slot rectangular microstrip patch antenna. Behavior of the loaded structure for different resistance values and different slot positions has been studied. A significant improvement in the bandwidth of slotted microstrip patch antenna has been achieved at the expense of gain. This antenna is designed to operate in the frequency range of (2.4/2.5GHz) which partially covers WiFi and WiMax frequency range.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"11 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":"127719170","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.2016.7929145
S. Wadkar, S. M. Rathod, H. Kumar, G. Kumar, B. Hogade
This paper describes the effect of wire with small circular ground plane size (radius < λ/20) for normal mode helical antenna at which resonance condition is achieved without using any external impedance matching network. A comparative study of variation in performance of helical antenna with respect to variation in thickness of wire and ground plane size at 1.8 GHz is carried out using simulation. By comparing various results, appropriate values of the parameters are selected and the proposed antenna has been fabricated and results are experimentally validated.
{"title":"Normal mode helical antenna at 1.8 GHz with small circular ground plane","authors":"S. Wadkar, S. M. Rathod, H. Kumar, G. Kumar, B. Hogade","doi":"10.1109/APSYM.2016.7929145","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929145","url":null,"abstract":"This paper describes the effect of wire with small circular ground plane size (radius < λ/20) for normal mode helical antenna at which resonance condition is achieved without using any external impedance matching network. A comparative study of variation in performance of helical antenna with respect to variation in thickness of wire and ground plane size at 1.8 GHz is carried out using simulation. By comparing various results, appropriate values of the parameters are selected and the proposed antenna has been fabricated and results are experimentally validated.","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":"130479249","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.2016.7929155
A. Deshmukh, P. Zaveri, S. Deshmukh, A. Odhekar, K. P. Ray
Circular polarized response is realized when two orthogonal closely spaced resonant modes are excited in the patch. An E-shaped patch design using unequal lengths rectangular slots to give circular polarized response was reported. In the reported paper, proper analysis on resonant mode excited in the patch that gives circularly polarization is not explained. An extensive analysis explaining the effects of unequal length slots that gives circularly polarized response is presented in the present paper. The rectangular slots realizes tuning of higher order TM02 mode with respect to fundamental TM10 mode. Further, unequal lengths of two slots and feed point location optimizes the surface current contributions in orthogonal directions inside the patch which yields circularly polarized response. Thus, proposed study gives an insight into the functioning of circular polarized antenna that will help in designing similar configuration at other required frequencies.
{"title":"Analysis of circularly polarized E-shaped microstrip antenna","authors":"A. Deshmukh, P. Zaveri, S. Deshmukh, A. Odhekar, K. P. Ray","doi":"10.1109/APSYM.2016.7929155","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929155","url":null,"abstract":"Circular polarized response is realized when two orthogonal closely spaced resonant modes are excited in the patch. An E-shaped patch design using unequal lengths rectangular slots to give circular polarized response was reported. In the reported paper, proper analysis on resonant mode excited in the patch that gives circularly polarization is not explained. An extensive analysis explaining the effects of unequal length slots that gives circularly polarized response is presented in the present paper. The rectangular slots realizes tuning of higher order TM02 mode with respect to fundamental TM10 mode. Further, unequal lengths of two slots and feed point location optimizes the surface current contributions in orthogonal directions inside the patch which yields circularly polarized response. Thus, proposed study gives an insight into the functioning of circular polarized antenna that will help in designing similar configuration at other required frequencies.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"66 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":"131612508","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.2016.7929146
S. M. Rathod, R. Awale, K. P. Ray, H. R. Mahajani, rathod. shivraj
In this paper, analysis of a lower order and dominant mode of a rectangular microstrip antenna with a loading of the single shorting post has been presented. Microstrip line feed of 50 Ω impedance along one of the radiating edges with a single shorting post has been proposed for impedance matching. A detailed investigation of the rectangular microstrip antenna with and without single shorting pin has been presented and experimentally validated with good agreement.
{"title":"Analysis of a single shorted rectangular microstrip antenna for 50Ωmicrostrip line feed","authors":"S. M. Rathod, R. Awale, K. P. Ray, H. R. Mahajani, rathod. shivraj","doi":"10.1109/APSYM.2016.7929146","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929146","url":null,"abstract":"In this paper, analysis of a lower order and dominant mode of a rectangular microstrip antenna with a loading of the single shorting post has been presented. Microstrip line feed of 50 Ω impedance along one of the radiating edges with a single shorting post has been proposed for impedance matching. A detailed investigation of the rectangular microstrip antenna with and without single shorting pin has been presented and experimentally validated with good agreement.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"35 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":"123945524","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.2016.7929152
Vineetha Joy, P. Mahima, R. U. Nair
A multilayered graded porous radome wall configuration for X- band is presented in this paper. The five layer radome wall is symmetrically constructed with the material parameters varying gradually from the middle layer to the skin layer on either side. Silicon Nitride (Si3N4) layers with varying porosity are used in the inner region to achieve variable dielectric parameters whereas a quartz based lamination is used in the outermost layers for enhanced structural rigidity and better impedance matching. The novel wall configuration is applied to a belly mounted hemispherical radome and the analysis results establish its superior EM performance characteristics in the desired frequency regime.
{"title":"Graded porous wall configuration for radome applications","authors":"Vineetha Joy, P. Mahima, R. U. Nair","doi":"10.1109/APSYM.2016.7929152","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929152","url":null,"abstract":"A multilayered graded porous radome wall configuration for X- band is presented in this paper. The five layer radome wall is symmetrically constructed with the material parameters varying gradually from the middle layer to the skin layer on either side. Silicon Nitride (Si3N4) layers with varying porosity are used in the inner region to achieve variable dielectric parameters whereas a quartz based lamination is used in the outermost layers for enhanced structural rigidity and better impedance matching. The novel wall configuration is applied to a belly mounted hemispherical radome and the analysis results establish its superior EM performance characteristics in the desired frequency regime.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"77 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":"116522528","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.2016.7929158
Utkarsh Deva, C. Saha
A gain enhancement technique of photo-conductive THz antenna (PCA) by optimal design of a GaAs conical horn and Si lens is proposed in this paper. Optimal choice of the flaring of the horn, length of the feeding circular waveguidesection and diameter of the aperture and hence Si-lens, dramatically increases the gain of the antenna. Proposed horn and Si-lens augmented antenna provides a maximum realized gain of 18.5 dBi along the axis of the horn. Proposed gain enhancement technique can be successfully used on various commercial photoconductive based THz antennas.
{"title":"Gain enhancement of photoconductive THz antenna using conical GaAs horn and Si lens","authors":"Utkarsh Deva, C. Saha","doi":"10.1109/APSYM.2016.7929158","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929158","url":null,"abstract":"A gain enhancement technique of photo-conductive THz antenna (PCA) by optimal design of a GaAs conical horn and Si lens is proposed in this paper. Optimal choice of the flaring of the horn, length of the feeding circular waveguidesection and diameter of the aperture and hence Si-lens, dramatically increases the gain of the antenna. Proposed horn and Si-lens augmented antenna provides a maximum realized gain of 18.5 dBi along the axis of the horn. Proposed gain enhancement technique can be successfully used on various commercial photoconductive based THz antennas.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"67 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":"123299805","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.2016.7929142
Bharati Singh, N. Sarwade, K. P. Ray
An antenna array with modified compact feed has been designed with non-identical elements using cosine square amplitude distribution with the purpose of reducing the first side lobe level. The proposed feed network uses an overall area of 25.47% less than that of a similar array with conventional corporate feed network. Experimental results of this six element array validate the theoretical parameters.
{"title":"A compact modified corporate feed network for antenna arrays with non-identical rectangular microstrip antenna elements","authors":"Bharati Singh, N. Sarwade, K. P. Ray","doi":"10.1109/APSYM.2016.7929142","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929142","url":null,"abstract":"An antenna array with modified compact feed has been designed with non-identical elements using cosine square amplitude distribution with the purpose of reducing the first side lobe level. The proposed feed network uses an overall area of 25.47% less than that of a similar array with conventional corporate feed network. Experimental results of this six element array validate the theoretical parameters.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"49 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":"132876461","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.2016.7929138
C. T. Manmohan, R. U. Nair, Hema Singh
For a coated conducting structure, it is necessary to deal with the field both inside and outside the structure for its scattering analysis. In this paper, the scattering of dielectric coated conducting elliptic cylindrical body is determined for both principal polarizations (TE/TM).The addition theorem is employed to analytically obtain the scattered field and hence radar cross section (RCS). The incident field, scattered field and the field within the dielectric coating are analytically derived in terms of angular and radial Mathieu functions and unknown scattering coefficients. These unknowns are obtained by applying appropriate boundary conditions. The parametric analysis of RCS of coated elliptic cylinder is presented.
{"title":"Radar cross section of a coated elliptic cylinder using addition theorem","authors":"C. T. Manmohan, R. U. Nair, Hema Singh","doi":"10.1109/APSYM.2016.7929138","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929138","url":null,"abstract":"For a coated conducting structure, it is necessary to deal with the field both inside and outside the structure for its scattering analysis. In this paper, the scattering of dielectric coated conducting elliptic cylindrical body is determined for both principal polarizations (TE/TM).The addition theorem is employed to analytically obtain the scattered field and hence radar cross section (RCS). The incident field, scattered field and the field within the dielectric coating are analytically derived in terms of angular and radial Mathieu functions and unknown scattering coefficients. These unknowns are obtained by applying appropriate boundary conditions. The parametric analysis of RCS of coated elliptic cylinder is presented.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"61 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":"130808322","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.2016.7929143
Jagori Raychaudhuri, Jayjit Mukherjee, S. Ray
In this paper, a suspended, compact, circularly polarized microstrip antenna with “SWASTIKA” shaped slot has been introduced which can be operated within the ISM band covering the range of 433 MHz—434.79 MHz. The antenna has been designed using two 1.59 mm FR4 substrate layers with an air gap of 1.59 mm. The antenna has been optimized using method of moment based commercially available electromagnetic simulator. A fair response of less than –10 dB return loss and less than 3 dB axial ratio has been observed for the proposed bandwidth. Based on the optimized configuration, an antenna is fabricated for ground penetrating radar (GPR) application.
{"title":"Compact circularly polarized suspended microstrip antenna with \"Swastika\" shaped slot","authors":"Jagori Raychaudhuri, Jayjit Mukherjee, S. Ray","doi":"10.1109/APSYM.2016.7929143","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929143","url":null,"abstract":"In this paper, a suspended, compact, circularly polarized microstrip antenna with “SWASTIKA” shaped slot has been introduced which can be operated within the ISM band covering the range of 433 MHz—434.79 MHz. The antenna has been designed using two 1.59 mm FR4 substrate layers with an air gap of 1.59 mm. The antenna has been optimized using method of moment based commercially available electromagnetic simulator. A fair response of less than –10 dB return loss and less than 3 dB axial ratio has been observed for the proposed bandwidth. Based on the optimized configuration, an antenna is fabricated for ground penetrating radar (GPR) application.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"81 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":"122576607","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.2016.7929153
M. Abraham, Abdul Wahab K.M, Sona O. Kundukulam, U. Ganesan
A collapsible wideband monopole antenna in VHF band has been presented. The antenna has a simple structure, consisting of multiple wire elements, bound together in a flat wide strip, and all joined at their base using a conductor. The proposed antenna exhibits 3:1 VSWR bandwidth (S11< -6dB) of 25%. The height reduction achieved by the proposed antenna is 20% compared to a conventional quarter wave monopole antenna.
{"title":"Compact collapsible wideband VHF antenna","authors":"M. Abraham, Abdul Wahab K.M, Sona O. Kundukulam, U. Ganesan","doi":"10.1109/APSYM.2016.7929153","DOIUrl":"https://doi.org/10.1109/APSYM.2016.7929153","url":null,"abstract":"A collapsible wideband monopole antenna in VHF band has been presented. The antenna has a simple structure, consisting of multiple wire elements, bound together in a flat wide strip, and all joined at their base using a conductor. The proposed antenna exhibits 3:1 VSWR bandwidth (S11< -6dB) of 25%. The height reduction achieved by the proposed antenna is 20% compared to a conventional quarter wave monopole antenna.","PeriodicalId":104746,"journal":{"name":"2016 International Symposium on Antennas and Propagation (APSYM)","volume":"14 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":"116013106","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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