Pub Date : 2015-11-01DOI: 10.1109/LAPC.2015.7366087
Hanyang Wang, Dawei Zhou, L. Xue, S. Gao, Hang Xu
An approach of mode analysis and excitation for slot antennas has been presented, which is based on a concept of impedance matching between the source and the slot modes. Wideband and multiband features of the slot antenna have been achieved by adjusting the frequency ratio between the slot modes. Several examples have been examined to demonstrate the effectiveness of the proposed approach.
{"title":"Mode analysis and excitation of slot antennas","authors":"Hanyang Wang, Dawei Zhou, L. Xue, S. Gao, Hang Xu","doi":"10.1109/LAPC.2015.7366087","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366087","url":null,"abstract":"An approach of mode analysis and excitation for slot antennas has been presented, which is based on a concept of impedance matching between the source and the slot modes. Wideband and multiband features of the slot antenna have been achieved by adjusting the frequency ratio between the slot modes. Several examples have been examined to demonstrate the effectiveness of the proposed approach.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"641 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123285516","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 : 2015-11-01DOI: 10.1109/LAPC.2015.7366023
A. Khaleghi, I. Balasingham
Body implanted devices are used to measure the level of different biological factors. Wireless technology is used to transfer this information to outside body. Some applications require long term continuous monitoring of the data. Therefore long term power supply source is needed that cannot be achieved easily. Ultra-low power technology and efficient design of the communication link can reduced the power consumption of the implant device. In this paper we investigate the frequency band of 200-3000 MHz for wireless bio implants. The RF path loss, related to the tissues, for different depths and frequencies is obtained through simulations. The optimum frequency range for two different tissues for abdominal and muscular parts is defined based on the minimum loss characteristics. By including a small antenna as the main part of the implant communication channel, simultaneous effects of tissue losses and antenna efficiency are considered. It is shown that the minimum loss for an implant communications can be achieved by defining an optimum frequency for each depth implementation.
{"title":"On selecting the frequency for wireless implant communications","authors":"A. Khaleghi, I. Balasingham","doi":"10.1109/LAPC.2015.7366023","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366023","url":null,"abstract":"Body implanted devices are used to measure the level of different biological factors. Wireless technology is used to transfer this information to outside body. Some applications require long term continuous monitoring of the data. Therefore long term power supply source is needed that cannot be achieved easily. Ultra-low power technology and efficient design of the communication link can reduced the power consumption of the implant device. In this paper we investigate the frequency band of 200-3000 MHz for wireless bio implants. The RF path loss, related to the tissues, for different depths and frequencies is obtained through simulations. The optimum frequency range for two different tissues for abdominal and muscular parts is defined based on the minimum loss characteristics. By including a small antenna as the main part of the implant communication channel, simultaneous effects of tissue losses and antenna efficiency are considered. It is shown that the minimum loss for an implant communications can be achieved by defining an optimum frequency for each depth implementation.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122303473","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 : 2015-11-01DOI: 10.1109/LAPC.2015.7366010
M. Bashri, T. Arslan, W. Zhou
This paper presents a linear phased array antenna with beam steering capability designed for WiFi and LTE mobile standards. The proposed antenna array utilizes 4 elements of patch antenna arranged in a flat configuration. The antenna element used in the array exhibits dual band characteristic covering 2 wide frequency bands; 2.35 GHz to 2.8 GHz (lower band) and 5 GHz to 5.5 GHz (upper band). To excite dual resonances, a rectangular ring slot was cut in the ground plane of the rectangular patch. The upper patch acts as the feeding element for the rectangular ring slot for lower band operation and as a radiator at the upper frequency band. The simulation results show a bi-directional radiation pattern at the lower frequency band and unidirectional at the upper band. By varying the phase of the individual antenna elements, the main beam of the proposed linear array can be steered to a range of ±40° for the lower band and ±22° for the upper band with side lobe level (SLL) and half-power beam width (HPBW) less than -7 dBi and 43° respectively. The array is intended to be fed by a corporate feeding network using three wideband 3-port Wilkinson power dividers. A FR4 (1.6 mm) is used as the antenna substrate and the feeding element. The overall size of the proposed array and the feeding element is 155 mm × 35 mm × 1.6 mm and 155 mm × 83 mm × 1.6 mm respectively. The designs and simulations have been carried out using CST Microwave Studio. The presented array antenna can be particularly applied to small and portable mobile base stations.
本文提出了一种具有波束导向能力的线性相控阵天线，设计用于WiFi和LTE移动标准。所提出的天线阵列利用以扁平结构布置的4个贴片天线单元。所述阵列中使用的天线元件具有覆盖2个宽频带的双频特性;2.35 GHz ~ 2.8 GHz(下频段)和5 GHz ~ 5.5 GHz(上频段)。为了激发双共振，在矩形贴片的接平面上切割一个矩形环形槽。所述上贴片作为用于下频带操作的矩形环形槽的馈电元件，并作为上频带的散热器。仿真结果表明，低频段呈双向辐射，高频段呈单向辐射。通过改变单个天线单元的相位，该线性阵列的主波束可以在旁瓣电平(SLL)和半功率波束宽度(HPBW)分别小于-7 dBi和43°的情况下，下频段控制在±40°，上频段控制在±22°。该阵列打算由使用三个宽带3端口威尔金森功率分配器的公司馈电网络馈电。采用FR4 (1.6 mm)作为天线基板和馈电元件。该阵列和进给元件的整体尺寸分别为155 mm × 35 mm × 1.6 mm和155 mm × 83 mm × 1.6 mm。利用CST Microwave Studio进行了设计和仿真。该阵列天线特别适用于小型便携式移动基站。
{"title":"A dual-band linear phased array antenna for WiFi and LTE mobile applications","authors":"M. Bashri, T. Arslan, W. Zhou","doi":"10.1109/LAPC.2015.7366010","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366010","url":null,"abstract":"This paper presents a linear phased array antenna with beam steering capability designed for WiFi and LTE mobile standards. The proposed antenna array utilizes 4 elements of patch antenna arranged in a flat configuration. The antenna element used in the array exhibits dual band characteristic covering 2 wide frequency bands; 2.35 GHz to 2.8 GHz (lower band) and 5 GHz to 5.5 GHz (upper band). To excite dual resonances, a rectangular ring slot was cut in the ground plane of the rectangular patch. The upper patch acts as the feeding element for the rectangular ring slot for lower band operation and as a radiator at the upper frequency band. The simulation results show a bi-directional radiation pattern at the lower frequency band and unidirectional at the upper band. By varying the phase of the individual antenna elements, the main beam of the proposed linear array can be steered to a range of ±40° for the lower band and ±22° for the upper band with side lobe level (SLL) and half-power beam width (HPBW) less than -7 dBi and 43° respectively. The array is intended to be fed by a corporate feeding network using three wideband 3-port Wilkinson power dividers. A FR4 (1.6 mm) is used as the antenna substrate and the feeding element. The overall size of the proposed array and the feeding element is 155 mm × 35 mm × 1.6 mm and 155 mm × 83 mm × 1.6 mm respectively. The designs and simulations have been carried out using CST Microwave Studio. The presented array antenna can be particularly applied to small and portable mobile base stations.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131065077","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 : 2015-11-01DOI: 10.1109/LAPC.2015.7366069
G. Muntoni, S. Casu, A. Fanti, G. Mazzarella
Composites material made form Carbon NanoTubes have attracted much interest as shielding materials. A new model for the full-wave simulation of the shielding effectiveness is presented. The full-wave evaluation of that effectiveness is also discussed.
{"title":"A simple model for SE evaluation of MWCNT composite","authors":"G. Muntoni, S. Casu, A. Fanti, G. Mazzarella","doi":"10.1109/LAPC.2015.7366069","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366069","url":null,"abstract":"Composites material made form Carbon NanoTubes have attracted much interest as shielding materials. A new model for the full-wave simulation of the shielding effectiveness is presented. The full-wave evaluation of that effectiveness is also discussed.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"175 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131189583","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 : 2015-11-01DOI: 10.1109/LAPC.2015.7366086
Yi Yang, G. Hilton, M. Beach
In this paper, the antennas performances for the 5.2 GHz 802.11n network are compared by three different access points with 3 antenna configurations based on the simulated throughput derived from measurements in a two-storey house. The aim here is to outline a methodology for access point performance taking account client orientation, MIMO data streams that can be supported and finally a total throughput metric. In order to demonstrate this, an example of a commercial access point (AP1) is compared with two alternative antenna configurations: an orthogonal array of dipoles (AP2) and a linear array of vertical dipoles (AP3). The measured radiation patterns are presented for all APs and pattern statics show the directionality and polarization mix. Simulated physical layer throughput is computed for all modulation and coding based on the measured spectral responses. Analysis shows the AP2 has the best overall performance with the average throughput of 138 Mbps, on the contrary, AP3 works the worst with the average throughput of 118 Mbps, it also finds that at some harsh locations, AP1 with directional antennas will boost the links to get a better performance that it can get over 29% higher than AP2.
{"title":"Evaluation of the antennas performance for three-element MIMO access points in a two-storey house","authors":"Yi Yang, G. Hilton, M. Beach","doi":"10.1109/LAPC.2015.7366086","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366086","url":null,"abstract":"In this paper, the antennas performances for the 5.2 GHz 802.11n network are compared by three different access points with 3 antenna configurations based on the simulated throughput derived from measurements in a two-storey house. The aim here is to outline a methodology for access point performance taking account client orientation, MIMO data streams that can be supported and finally a total throughput metric. In order to demonstrate this, an example of a commercial access point (AP1) is compared with two alternative antenna configurations: an orthogonal array of dipoles (AP2) and a linear array of vertical dipoles (AP3). The measured radiation patterns are presented for all APs and pattern statics show the directionality and polarization mix. Simulated physical layer throughput is computed for all modulation and coding based on the measured spectral responses. Analysis shows the AP2 has the best overall performance with the average throughput of 138 Mbps, on the contrary, AP3 works the worst with the average throughput of 118 Mbps, it also finds that at some harsh locations, AP1 with directional antennas will boost the links to get a better performance that it can get over 29% higher than AP2.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"407 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114015748","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 : 2015-11-01DOI: 10.1109/LAPC.2015.7366099
A. Korotkov, S. Knyazev, S. Shabunin
Luneburg lens antenna radiation field is calculated with Green's functions of a layered cylindrical structure. Electric field components of Luneburg lens excited by electric and magnetic dipoles, Huygens source and a circularly polarized antenna formed by two crossed electric dipoles with 90-degree phase shift are considered. Electric field calculation for the Luneburg lens antenna in the far zone is simplified by saddle-point method. Radiation patterns are shown. The influence of an outer cylinder radius and number of layers on radiation efficiency is investigated. Polarization properties of a cylindrical Luneburg lens excited by a source with circular wave polarization are analyzed. The proposed method significantly reduces computing time for multilayered lens in comparison with the most commonly used in antenna design.
{"title":"Fast analysis of cylindrical Luneburg lens radiation by green's function method","authors":"A. Korotkov, S. Knyazev, S. Shabunin","doi":"10.1109/LAPC.2015.7366099","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366099","url":null,"abstract":"Luneburg lens antenna radiation field is calculated with Green's functions of a layered cylindrical structure. Electric field components of Luneburg lens excited by electric and magnetic dipoles, Huygens source and a circularly polarized antenna formed by two crossed electric dipoles with 90-degree phase shift are considered. Electric field calculation for the Luneburg lens antenna in the far zone is simplified by saddle-point method. Radiation patterns are shown. The influence of an outer cylinder radius and number of layers on radiation efficiency is investigated. Polarization properties of a cylindrical Luneburg lens excited by a source with circular wave polarization are analyzed. The proposed method significantly reduces computing time for multilayered lens in comparison with the most commonly used in antenna design.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114358260","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 : 2015-11-01DOI: 10.1109/LAPC.2015.7366035
W. Rowe, Aupi R. As-Saber, S. Azemi, K. Ghorbani
The development and transmission/reflection characteristics of a 3D dual cylinder Frequency Selective Surface (FSS) is presented. The investigation shows that the length of the resonant cylinders in the unit cell has significant effect on the frequency characteristics of the FSS, and the FSS can produce close band or highly selective responses. A stop and pass band very close to one another (essentially 1:1 band ratio) is achieved using equal length cylinders, without the need for any active components. Independently varying the unit cell cylinder heights produced a highly selective pass band with less than 0.3 dB insertion loss and deep nulls only approximately 500 kHz on either side. The dual cylinder 3D FSS was also experimentally verified, achieving very good agreement between the simulation and measurement results.
{"title":"3D frequency selective surfaces with highly selective reponses","authors":"W. Rowe, Aupi R. As-Saber, S. Azemi, K. Ghorbani","doi":"10.1109/LAPC.2015.7366035","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366035","url":null,"abstract":"The development and transmission/reflection characteristics of a 3D dual cylinder Frequency Selective Surface (FSS) is presented. The investigation shows that the length of the resonant cylinders in the unit cell has significant effect on the frequency characteristics of the FSS, and the FSS can produce close band or highly selective responses. A stop and pass band very close to one another (essentially 1:1 band ratio) is achieved using equal length cylinders, without the need for any active components. Independently varying the unit cell cylinder heights produced a highly selective pass band with less than 0.3 dB insertion loss and deep nulls only approximately 500 kHz on either side. The dual cylinder 3D FSS was also experimentally verified, achieving very good agreement between the simulation and measurement results.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129315600","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 : 2015-11-01DOI: 10.1109/LAPC.2015.7366079
A. Diewald
The author reports about the progress of an in-house developed radar simulator for active and passive electromagnetic sensing. The goal of the development is to create a very fast simulation tool with an analytical approach. In this paper, the analytical description for the coupling between the radar antennas is described. The scattering parameters including the phase information is calculated. Some examples are given to prove the feasibility of the approach.
{"title":"Antenna coupling for computational radar simulation","authors":"A. Diewald","doi":"10.1109/LAPC.2015.7366079","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366079","url":null,"abstract":"The author reports about the progress of an in-house developed radar simulator for active and passive electromagnetic sensing. The goal of the development is to create a very fast simulation tool with an analytical approach. In this paper, the analytical description for the coupling between the radar antennas is described. The scattering parameters including the phase information is calculated. Some examples are given to prove the feasibility of the approach.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116653898","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 : 2015-11-01DOI: 10.1109/LAPC.2015.7366037
Yang Chenwei, Gang Wang
A UHF passive RFID tag being sensitive to dielectric property of object to be identified is designed and tested. The proposed RFID tag operates at 915MHz and has dimensions of 35mm×17.5mm(0.11λ*0.06λ)· The tag is designed to be very admissive of paper-like objective of relative dielectric constant of 2.5. When attached to objectives of other dielectric constants, the operation range of the tag degrades significantly, which indicates a tag can be bound up with objects of specific material.
{"title":"UHF RFID tag sensitive to object material","authors":"Yang Chenwei, Gang Wang","doi":"10.1109/LAPC.2015.7366037","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366037","url":null,"abstract":"A UHF passive RFID tag being sensitive to dielectric property of object to be identified is designed and tested. The proposed RFID tag operates at 915MHz and has dimensions of 35mm×17.5mm(0.11λ*0.06λ)· The tag is designed to be very admissive of paper-like objective of relative dielectric constant of 2.5. When attached to objectives of other dielectric constants, the operation range of the tag degrades significantly, which indicates a tag can be bound up with objects of specific material.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123586006","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 : 2015-11-01DOI: 10.1109/LAPC.2015.7366029
S. Mahmoud, M. Kourah
We investigate the design of Yagi-array made of parasitic dielectric spheres excited by a simple dipole to operate in the infrared range of wavelengths. Each dielectric sphere acts as a magnetic dipole near to the resonant frequency of the TE01 mode. The idea is also extended to the microwave range of frequencies utilizing an array of dielectric resonators on a microstrip structure. Analytical as well as simulation studies are carried out and the results verify the feasibility of achieving a directive array over a certain bandwidth. The so designed array proves to have compact size in comparison with the conventional wire Yagi array.
{"title":"Analysis and design of directive antenna array using parasitic dielectric resonators","authors":"S. Mahmoud, M. Kourah","doi":"10.1109/LAPC.2015.7366029","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366029","url":null,"abstract":"We investigate the design of Yagi-array made of parasitic dielectric spheres excited by a simple dipole to operate in the infrared range of wavelengths. Each dielectric sphere acts as a magnetic dipole near to the resonant frequency of the TE01 mode. The idea is also extended to the microwave range of frequencies utilizing an array of dielectric resonators on a microstrip structure. Analytical as well as simulation studies are carried out and the results verify the feasibility of achieving a directive array over a certain bandwidth. The so designed array proves to have compact size in comparison with the conventional wire Yagi array.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129166257","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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