Pub Date : 2016-11-01DOI: 10.1109/LAPC.2016.7807521
D. Mohan, S. Armour, A. Ganesh, F. Tosato, Fengming Cao
The paper focuses on the performance analysis of channel assignment algorithms for peer to peer wireless ad hoc network by means of realistic channel model. The channel assignment is modeled as an edge colouring problem and two colouring algorithms including random and greedy colouring have been studied using the realistic 3D ray tracing based path loss model and its performance is compared with the theoretical model. The simulation study shows that the algorithms perform better with the ray tracer model with around 10 dB improvement in SINR as compared to the theoretical model.
{"title":"Performance study of channel assignment algorithms in peer to peer wireless ad hoc networks","authors":"D. Mohan, S. Armour, A. Ganesh, F. Tosato, Fengming Cao","doi":"10.1109/LAPC.2016.7807521","DOIUrl":"https://doi.org/10.1109/LAPC.2016.7807521","url":null,"abstract":"The paper focuses on the performance analysis of channel assignment algorithms for peer to peer wireless ad hoc network by means of realistic channel model. The channel assignment is modeled as an edge colouring problem and two colouring algorithms including random and greedy colouring have been studied using the realistic 3D ray tracing based path loss model and its performance is compared with the theoretical model. The simulation study shows that the algorithms perform better with the ray tracer model with around 10 dB improvement in SINR as compared to the theoretical model.","PeriodicalId":253379,"journal":{"name":"2016 Loughborough Antennas & Propagation Conference (LAPC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114934329","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 : 2016-11-01DOI: 10.1109/LAPC.2016.7807611
H. Taher, R. Farrell
In this paper, square slot (SS) upheld by the substrate integrated waveguide (SIW) cavity is presented. A simple 50 Ω microstrip line is employed to feed this cavity. Then slot matched cavity modes are coupled to the slot and radiated efficiently. The proposed antenna features the following structural advantages, compact size, light weight and easy low cost fabrication. Concerning the electrical performance, it exhibits 15% impedance bandwidth for the reflection coefficient less than -10 dB and the realized gain touches 8.5 dB frontier.
{"title":"Broadband high gain SIW cavity square slot antenna for X-band applications","authors":"H. Taher, R. Farrell","doi":"10.1109/LAPC.2016.7807611","DOIUrl":"https://doi.org/10.1109/LAPC.2016.7807611","url":null,"abstract":"In this paper, square slot (SS) upheld by the substrate integrated waveguide (SIW) cavity is presented. A simple 50 Ω microstrip line is employed to feed this cavity. Then slot matched cavity modes are coupled to the slot and radiated efficiently. The proposed antenna features the following structural advantages, compact size, light weight and easy low cost fabrication. Concerning the electrical performance, it exhibits 15% impedance bandwidth for the reflection coefficient less than -10 dB and the realized gain touches 8.5 dB frontier.","PeriodicalId":253379,"journal":{"name":"2016 Loughborough Antennas & Propagation Conference (LAPC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129416660","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 : 2016-11-01DOI: 10.1109/LAPC.2016.7807600
Dominic Makaa Kitavi, Hao Tan, K. T. Wong
A tetrahedral array is often used in acoustical sensing for its two-dimensional directivity despite its simplicity. What if a constituent sensor fails in the tetrahedral array? This work presents a lower bound of azimuth-elevation direction finding, when up to one of the array's constituent sensors fails but when the overall array remains functional.
{"title":"A regular tetrahedral array whose constituent sensors fail randomly — A lower bound for direction-of-arrival estimation","authors":"Dominic Makaa Kitavi, Hao Tan, K. T. Wong","doi":"10.1109/LAPC.2016.7807600","DOIUrl":"https://doi.org/10.1109/LAPC.2016.7807600","url":null,"abstract":"A tetrahedral array is often used in acoustical sensing for its two-dimensional directivity despite its simplicity. What if a constituent sensor fails in the tetrahedral array? This work presents a lower bound of azimuth-elevation direction finding, when up to one of the array's constituent sensors fails but when the overall array remains functional.","PeriodicalId":253379,"journal":{"name":"2016 Loughborough Antennas & Propagation Conference (LAPC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123938684","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 : 2016-11-01DOI: 10.1109/LAPC.2016.7807588
Omar Elizarraras, A. Mendez, A. Reyna, M. Panduro
This paper presents the synthesis of a 3D scannable pattern for spherical antenna arrays. This design of steerable spherical antenna arrays considers the optimization of the amplitude and phase excitations across the antenna elements. The synthesis process is carried out by the evolutionary optimization technique of Differential Evolution. Simulation results for scannable spherical antenna arrays with amplitude and phase excitation optimized by Differential Evolution demonstrate that this evolutionary technique could provide better performance in terms of side lobe level and directivity with respect to the conventional case of progressive phase excitation.
{"title":"Design of spherical antenna arrays for a 3D scannable pattern using differential evolution","authors":"Omar Elizarraras, A. Mendez, A. Reyna, M. Panduro","doi":"10.1109/LAPC.2016.7807588","DOIUrl":"https://doi.org/10.1109/LAPC.2016.7807588","url":null,"abstract":"This paper presents the synthesis of a 3D scannable pattern for spherical antenna arrays. This design of steerable spherical antenna arrays considers the optimization of the amplitude and phase excitations across the antenna elements. The synthesis process is carried out by the evolutionary optimization technique of Differential Evolution. Simulation results for scannable spherical antenna arrays with amplitude and phase excitation optimized by Differential Evolution demonstrate that this evolutionary technique could provide better performance in terms of side lobe level and directivity with respect to the conventional case of progressive phase excitation.","PeriodicalId":253379,"journal":{"name":"2016 Loughborough Antennas & Propagation Conference (LAPC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116308322","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 : 2016-11-01DOI: 10.1109/LAPC.2016.7807534
A. Bekasiewicz, S. Koziel, Q. Cheng
In this paper, we demonstrate the importance of precise reflection response control of enhanced-bandwidth antennas by means of automated simulation-driven optimization. In particular, a proper adjustment of antenna dimensions may lead to considerable broadening of the bandwidth even for small topological modifications of the structure. Computational efficiency of the design process is achieved by using surrogate-based optimization with coarse-discretization EM simulations utilized as the underlying low-fidelity antenna model. Furthermore, a penalty function approach allows us to precisely control the maximum in-band reflection so that sufficient margin to accommodate possible manufacturing tolerances is obtained. The optimized designs of the two antennas considered here feature over 31% and 38% bandwidth, respectively, w.r.t. the center frequency of 5.6 GHz. Simulation results are validated using measurements of the fabricated prototypes.
{"title":"Reflection response control of bandwidth-enhanced antennas through constrained optimization","authors":"A. Bekasiewicz, S. Koziel, Q. Cheng","doi":"10.1109/LAPC.2016.7807534","DOIUrl":"https://doi.org/10.1109/LAPC.2016.7807534","url":null,"abstract":"In this paper, we demonstrate the importance of precise reflection response control of enhanced-bandwidth antennas by means of automated simulation-driven optimization. In particular, a proper adjustment of antenna dimensions may lead to considerable broadening of the bandwidth even for small topological modifications of the structure. Computational efficiency of the design process is achieved by using surrogate-based optimization with coarse-discretization EM simulations utilized as the underlying low-fidelity antenna model. Furthermore, a penalty function approach allows us to precisely control the maximum in-band reflection so that sufficient margin to accommodate possible manufacturing tolerances is obtained. The optimized designs of the two antennas considered here feature over 31% and 38% bandwidth, respectively, w.r.t. the center frequency of 5.6 GHz. Simulation results are validated using measurements of the fabricated prototypes.","PeriodicalId":253379,"journal":{"name":"2016 Loughborough Antennas & Propagation Conference (LAPC)","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114719835","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 : 2016-11-01DOI: 10.1109/LAPC.2016.7807552
A. Rahimian, Y. Alfadhl
This paper presents wireless system considerations and theoretical analysis of the multiplexing scheme intended for the employment in the short-range communications. The primary objective of this paper is to develop a comprehensive analytical investigation into the radio frequency (RF) systems involving the orbital angular momentum (OAM) of the electromagnetic (EM) wave; as a sophisticated and generalised alternative solution for the wireless subsystems deployment realisation. The analysis has been conducted based on the vortex beam generating concepts, incorporating the intrinsic potential components of the modified orthogonal frequency-division multiplexing (OFDM) parameters.
{"title":"Analytical discussion of vortex-centric wireless OFDM systems for short-range applications","authors":"A. Rahimian, Y. Alfadhl","doi":"10.1109/LAPC.2016.7807552","DOIUrl":"https://doi.org/10.1109/LAPC.2016.7807552","url":null,"abstract":"This paper presents wireless system considerations and theoretical analysis of the multiplexing scheme intended for the employment in the short-range communications. The primary objective of this paper is to develop a comprehensive analytical investigation into the radio frequency (RF) systems involving the orbital angular momentum (OAM) of the electromagnetic (EM) wave; as a sophisticated and generalised alternative solution for the wireless subsystems deployment realisation. The analysis has been conducted based on the vortex beam generating concepts, incorporating the intrinsic potential components of the modified orthogonal frequency-division multiplexing (OFDM) parameters.","PeriodicalId":253379,"journal":{"name":"2016 Loughborough Antennas & Propagation Conference (LAPC)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124444089","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 : 2016-11-01DOI: 10.1109/LAPC.2016.7807566
S. Shahid, G. Gentili
A novel shaped horn antenna is proposed to improve the spot focusing and imaging systems performance at terahertz frequencies. In this paper, a waveguide-horn-waveguide structure scheme is used to model a horn antenna in order to avoid lens corrected on horn apertures usually needed to enhance the focusing. The shaped horn and lens corrected horn are compared for performance comparison at 0.92, 0.94, 0.98 and 1THz keeping horn aperture diameter 1.7mm and length 3.1mm for both type of horn antennas. The horn antennas are designed and simulated with an accurate proprietary Body-of-revolution Finite-Element code and fed by circular waveguide operating at TE11 mode. Comparison study highlighted that, the shaped horn provided slightly better spot focusing of 0.16, 0.15, 0.08 and 0.09mm as compared to lens corrected horn. The proposed shaped horn is found suitable candidate for frequency domain near field focusing in terahertz imaging systems.
{"title":"Shaped horn antenna for spot focusing THz imaging application","authors":"S. Shahid, G. Gentili","doi":"10.1109/LAPC.2016.7807566","DOIUrl":"https://doi.org/10.1109/LAPC.2016.7807566","url":null,"abstract":"A novel shaped horn antenna is proposed to improve the spot focusing and imaging systems performance at terahertz frequencies. In this paper, a waveguide-horn-waveguide structure scheme is used to model a horn antenna in order to avoid lens corrected on horn apertures usually needed to enhance the focusing. The shaped horn and lens corrected horn are compared for performance comparison at 0.92, 0.94, 0.98 and 1THz keeping horn aperture diameter 1.7mm and length 3.1mm for both type of horn antennas. The horn antennas are designed and simulated with an accurate proprietary Body-of-revolution Finite-Element code and fed by circular waveguide operating at TE11 mode. Comparison study highlighted that, the shaped horn provided slightly better spot focusing of 0.16, 0.15, 0.08 and 0.09mm as compared to lens corrected horn. The proposed shaped horn is found suitable candidate for frequency domain near field focusing in terahertz imaging systems.","PeriodicalId":253379,"journal":{"name":"2016 Loughborough Antennas & Propagation Conference (LAPC)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130441551","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 : 2016-11-01DOI: 10.1109/LAPC.2016.7807593
A. Shastri, S. Jun, B. Sanz-Izquierdo, H. Aldawas, Q. Ahmed, M. Sobhy
This paper deals with the functionality of an inkjet printed slot antenna for radio frequency (RF) energy harvesting application. The antenna is printed on a paper substrate using an off the shelf inkjet printer with cartridges containing nano particle silver ink. The RF performance of the printed antenna is assessed, and compared with another antenna fabricated using conventional etching methods. The reflection coefficient characteristics of the two antennas are very similar. A Power Cast radio frequency (RF) power transfer and energy harvesting system is employed for the final evaluation of the antennas. The inkjet printed antenna is able to harvest a good amount of RF power, though less than the equivalent copper etched antenna on Mylar substrate. The antennas operate at the 915MHz UHF ISM band. Finite-difference-time-domain simulations compare well with test results.
{"title":"Evaluation of a low-cost inkjet printed slot antenna for energy harvesting applications","authors":"A. Shastri, S. Jun, B. Sanz-Izquierdo, H. Aldawas, Q. Ahmed, M. Sobhy","doi":"10.1109/LAPC.2016.7807593","DOIUrl":"https://doi.org/10.1109/LAPC.2016.7807593","url":null,"abstract":"This paper deals with the functionality of an inkjet printed slot antenna for radio frequency (RF) energy harvesting application. The antenna is printed on a paper substrate using an off the shelf inkjet printer with cartridges containing nano particle silver ink. The RF performance of the printed antenna is assessed, and compared with another antenna fabricated using conventional etching methods. The reflection coefficient characteristics of the two antennas are very similar. A Power Cast radio frequency (RF) power transfer and energy harvesting system is employed for the final evaluation of the antennas. The inkjet printed antenna is able to harvest a good amount of RF power, though less than the equivalent copper etched antenna on Mylar substrate. The antennas operate at the 915MHz UHF ISM band. Finite-difference-time-domain simulations compare well with test results.","PeriodicalId":253379,"journal":{"name":"2016 Loughborough Antennas & Propagation Conference (LAPC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131853224","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 : 2016-11-01DOI: 10.1109/LAPC.2016.7807473
M. Shokry, A. Allam
SIW uniform leaky wave antennas with and without supported ground are designed in this paper. The antenna conducts beam steering from 0° to 178°, operates on multiple frequency bands and has average gain of -6.5dB. On the other hand when added a supported ground to the same design, the antenna operates on a wider frequency band and the beam width becomes narrower with average gain of 7.5 dB and frequency steering from 16 to 143°. Both of the antennas are simulated by the CST microwave studio, fabricated on Roger 5880 and measured using the network analyzer. There are a good agreement between the measured and simulated results.
{"title":"Design of uniform SIW leaky wave antenna: With and without supported ground","authors":"M. Shokry, A. Allam","doi":"10.1109/LAPC.2016.7807473","DOIUrl":"https://doi.org/10.1109/LAPC.2016.7807473","url":null,"abstract":"SIW uniform leaky wave antennas with and without supported ground are designed in this paper. The antenna conducts beam steering from 0° to 178°, operates on multiple frequency bands and has average gain of -6.5dB. On the other hand when added a supported ground to the same design, the antenna operates on a wider frequency band and the beam width becomes narrower with average gain of 7.5 dB and frequency steering from 16 to 143°. Both of the antennas are simulated by the CST microwave studio, fabricated on Roger 5880 and measured using the network analyzer. There are a good agreement between the measured and simulated results.","PeriodicalId":253379,"journal":{"name":"2016 Loughborough Antennas & Propagation Conference (LAPC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131304027","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 : 2016-11-01DOI: 10.1109/LAPC.2016.7807477
S. F. Jilani, A. Alomainy
This paper presents a T-shaped antenna at millimetre-wave (MMW) frequency ranges to offer a number of advantages including simple structure, high operating bandwidth, and high gain. Defected ground structures (DGS) have been symmetrically added in ground in order to produce multiple resonating bands, accompanied by partial ground plane to achieve continuous operating bandwidth. The antenna consists of T-shaped radiating patch with a coplanar waveguide (CPW) feed. The bottom part has a partial ground plane loaded with five symmetrical split-ring slots. Measured results of antenna prototype show a wide bandwidth of 25.1-37.5 GHz. Moreover, simulation evaluation of peak gain of the antenna is 9.86 dBi at 36.8 GHz, and efficiency is higher than 80% in complete range of operation. The proposed antenna is considered as a potential candidate for the 5G wireless networks and applications.
{"title":"Millimetre-wave T-shaped antenna with defected ground structures for 5G wireless networks","authors":"S. F. Jilani, A. Alomainy","doi":"10.1109/LAPC.2016.7807477","DOIUrl":"https://doi.org/10.1109/LAPC.2016.7807477","url":null,"abstract":"This paper presents a T-shaped antenna at millimetre-wave (MMW) frequency ranges to offer a number of advantages including simple structure, high operating bandwidth, and high gain. Defected ground structures (DGS) have been symmetrically added in ground in order to produce multiple resonating bands, accompanied by partial ground plane to achieve continuous operating bandwidth. The antenna consists of T-shaped radiating patch with a coplanar waveguide (CPW) feed. The bottom part has a partial ground plane loaded with five symmetrical split-ring slots. Measured results of antenna prototype show a wide bandwidth of 25.1-37.5 GHz. Moreover, simulation evaluation of peak gain of the antenna is 9.86 dBi at 36.8 GHz, and efficiency is higher than 80% in complete range of operation. The proposed antenna is considered as a potential candidate for the 5G wireless networks and applications.","PeriodicalId":253379,"journal":{"name":"2016 Loughborough Antennas & Propagation Conference (LAPC)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116366540","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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