Pub Date : 2015-11-01DOI: 10.1109/LAPC.2015.7366127
N. P. B. Kammersgaard, S. Kvist, J. Thaysen, K. Jakobsen
A novel idea for improving the off-body transmission range for hearing instruments is presented. The idea is to use the ear-to-ear communication to improve the range. If one of the hearing instruments loses the connection to an off-body accessory it can reestablish the connection through the other hearing instrument. The median improvement of the measured and simulated gain of the hearing instrument is 9.7 dB and 7.0 dB, respectively. This corresponds to a transmission range improvement of 204% and 123% under free-space conditions and 74% and 49% if a ground reflection is assumed.
{"title":"Off-body transmission range improvement for hearing instruments by the use of ear-to-ear communication","authors":"N. P. B. Kammersgaard, S. Kvist, J. Thaysen, K. Jakobsen","doi":"10.1109/LAPC.2015.7366127","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366127","url":null,"abstract":"A novel idea for improving the off-body transmission range for hearing instruments is presented. The idea is to use the ear-to-ear communication to improve the range. If one of the hearing instruments loses the connection to an off-body accessory it can reestablish the connection through the other hearing instrument. The median improvement of the measured and simulated gain of the hearing instrument is 9.7 dB and 7.0 dB, respectively. This corresponds to a transmission range improvement of 204% and 123% under free-space conditions and 74% and 49% if a ground reflection is assumed.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"45 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":"128727022","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.2015.7366013
D. Letavin, Y. E. Mitelman, V. Chechetkin
A miniaturized branch-line coupler based on lowpass microstrip filters instead of conventional transmission lines is presented in this paper. The design of proposed couplers is performed using lowpass filter of 5th, 7th and 9th order. This is done to achieve a compact circuit layout in microstrip implementation. Prototypes with these proposed structures, operating at 2 GHz frequency, have been designed and implemented using microstrip technology.
{"title":"Realization of miniaturized branch-line coupler using lowpass microstrip filters","authors":"D. Letavin, Y. E. Mitelman, V. Chechetkin","doi":"10.1109/LAPC.2015.7366013","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366013","url":null,"abstract":"A miniaturized branch-line coupler based on lowpass microstrip filters instead of conventional transmission lines is presented in this paper. The design of proposed couplers is performed using lowpass filter of 5th, 7th and 9th order. This is done to achieve a compact circuit layout in microstrip implementation. Prototypes with these proposed structures, operating at 2 GHz frequency, have been designed and implemented using microstrip technology.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"173 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":"129135535","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.2015.7366132
V. Popov, V. Ovsyanikov
The results of the comparative evaluation of thermal noise parameters of plasma, dielectric and metal microwave antennas in a wide frequency range are given.
给出了等离子体、介质和金属微波天线在宽频率范围内热噪声参数的比较评价结果。
{"title":"Thermal noise of microwave antennas","authors":"V. Popov, V. Ovsyanikov","doi":"10.1109/LAPC.2015.7366132","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366132","url":null,"abstract":"The results of the comparative evaluation of thermal noise parameters of plasma, dielectric and metal microwave antennas in a wide frequency range are given.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"44 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":"128304452","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.2015.7366027
M. Lashab, N. A. Jan, Chemss-Eddine, F. Benabdelaziz, R. Abd‐Alhameed
In this paper the I shape antenna considered as CPW-Fed antenna type is loaded with zero order resonator (ZOR) for miniaturization effect, the antenna contains one slot as monopole bar related to the I shape antenna, the antenna is loaded with zigzag resonator (ZR) inserted between the two parts of the I shape antenna, an inter-digital capacitor is incorporated inside the lower part of the antenna. The aim of this work is to exhibit the miniaturization effect with an improvement of the gain and the bandwidth by zero order resonator insertion. The obtained results from HFSS simulation concerning CPW loaded with the zero order resonator show that the operating bandwidth is a (tri band) in the range of 1.85 GHz to 2.2 GHz as WLAN band, and 5.8 GHz to 6.2 GHz as Wifi and Wimax and 6.8 GHz to 8.2 GHz application.
{"title":"The I shape antenna loaded with ZOR for WLAN and WiMax application","authors":"M. Lashab, N. A. Jan, Chemss-Eddine, F. Benabdelaziz, R. Abd‐Alhameed","doi":"10.1109/LAPC.2015.7366027","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366027","url":null,"abstract":"In this paper the I shape antenna considered as CPW-Fed antenna type is loaded with zero order resonator (ZOR) for miniaturization effect, the antenna contains one slot as monopole bar related to the I shape antenna, the antenna is loaded with zigzag resonator (ZR) inserted between the two parts of the I shape antenna, an inter-digital capacitor is incorporated inside the lower part of the antenna. The aim of this work is to exhibit the miniaturization effect with an improvement of the gain and the bandwidth by zero order resonator insertion. The obtained results from HFSS simulation concerning CPW loaded with the zero order resonator show that the operating bandwidth is a (tri band) in the range of 1.85 GHz to 2.2 GHz as WLAN band, and 5.8 GHz to 6.2 GHz as Wifi and Wimax and 6.8 GHz to 8.2 GHz application.","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":"117116509","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.2015.7366075
M. Oliaei, R. Sadeghzadeh, Yashar Mokhtar Ba Ekhtiar
In the recent years, various antennas have been used for delivering the satellite data specially pictures such as Reflector, Helical, Microstrip Patch, Slot, Multi-Mode Horn (MMH) and Cross dipole antennas. In this paper, an isoflux pattern antenna with high resolution and data rate has been proposed for employing in the LEO satellites at C band which has dropping arms for attaining the best antenna performance characteristics. This small size dropping cross dipole antenna contains an appropriate -10 dB bandwidth of Su from 6.9 GHz to 7.8 GHz (approximately 0.9 GHz bandwidth with center frequency at 7.4 GHz) accompanied by VSWR<;2. The simulated gain obtained by ANSYS HFSS using the Finite Element Method (FEM) is approximately 5 dB. It should be mentioned that the primary sense of the polarization in the proximity of the center of the band is near Left Hand Circular Polarization (LHCP) and the compact occupied size (height × radial) of antenna is 40mm × 80mm.
{"title":"Small size dropping cross dipole antenna with isoflux pattern in C band for LEO satellites","authors":"M. Oliaei, R. Sadeghzadeh, Yashar Mokhtar Ba Ekhtiar","doi":"10.1109/LAPC.2015.7366075","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366075","url":null,"abstract":"In the recent years, various antennas have been used for delivering the satellite data specially pictures such as Reflector, Helical, Microstrip Patch, Slot, Multi-Mode Horn (MMH) and Cross dipole antennas. In this paper, an isoflux pattern antenna with high resolution and data rate has been proposed for employing in the LEO satellites at C band which has dropping arms for attaining the best antenna performance characteristics. This small size dropping cross dipole antenna contains an appropriate -10 dB bandwidth of Su from 6.9 GHz to 7.8 GHz (approximately 0.9 GHz bandwidth with center frequency at 7.4 GHz) accompanied by VSWR<;2. The simulated gain obtained by ANSYS HFSS using the Finite Element Method (FEM) is approximately 5 dB. It should be mentioned that the primary sense of the polarization in the proximity of the center of the band is near Left Hand Circular Polarization (LHCP) and the compact occupied size (height × radial) of antenna is 40mm × 80mm.","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":"122744261","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.2015.7365995
M. Karami, R. Sadeghzadeh, M. Sharifi
In this paper, a new broadband Frequency Selective Surface (FSS) electromagnetic absorber (EMA) is proposed. The absorber consists of circular metallic patches with different dimensions backed by a foam spacer and metallic ground. The patches provide different resonances resulting in improvement of the absorption characteristics of the proposed EMA. The reflection coefficient of the proposed EMA with a thickness of 3.4 mm is less than -10 dB from 8 to 12 GHz frequency spectrum. For both TE and TM-polarized waves, the reflection coefficient of the presented EMA is almost independent of the incidence angle from 0° to 30°.
{"title":"A broadband frequency selective surface absorber using nonuniform circular metallic patches","authors":"M. Karami, R. Sadeghzadeh, M. Sharifi","doi":"10.1109/LAPC.2015.7365995","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7365995","url":null,"abstract":"In this paper, a new broadband Frequency Selective Surface (FSS) electromagnetic absorber (EMA) is proposed. The absorber consists of circular metallic patches with different dimensions backed by a foam spacer and metallic ground. The patches provide different resonances resulting in improvement of the absorption characteristics of the proposed EMA. The reflection coefficient of the proposed EMA with a thickness of 3.4 mm is less than -10 dB from 8 to 12 GHz frequency spectrum. For both TE and TM-polarized waves, the reflection coefficient of the presented EMA is almost independent of the incidence angle from 0° to 30°.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"94 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":"126109089","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.2015.7366074
Andrea Ruaro, J. Thaysen, K. Jakobsen
Wearable electronics is often challenged by the extremely reduced space available to the antenna design. This study assesses the impact that the coupling to a large battery has on a small antenna for wearable devices. The coupling mechanism and its potential risks for the Electromagnetic Compatibility (EMC) performance are discussed in detail. Once the battery is placed within an electronic device, it is seen that one of the main performance parameters, i.e., the antenna radiation efficiency, may drop up to 1.2 dB depending on the battery size.
{"title":"Battery coupling impact on the antenna efficiency in a small wearable device","authors":"Andrea Ruaro, J. Thaysen, K. Jakobsen","doi":"10.1109/LAPC.2015.7366074","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366074","url":null,"abstract":"Wearable electronics is often challenged by the extremely reduced space available to the antenna design. This study assesses the impact that the coupling to a large battery has on a small antenna for wearable devices. The coupling mechanism and its potential risks for the Electromagnetic Compatibility (EMC) performance are discussed in detail. Once the battery is placed within an electronic device, it is seen that one of the main performance parameters, i.e., the antenna radiation efficiency, may drop up to 1.2 dB depending on the battery size.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"119 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":"128482676","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.2015.7366002
A. AbouAlmal, H. Alhassan, Huthaifa Obeidat, M. Abusitta, R. Abd‐Alhameed, S. Jones, H. Al-Ahmad
In this paper, long-term meteorological data are measured using six fixed surface weather stations and one radiosonde in the subtropical Arabian Gulf region, in particular United Arab Emirates (UAE). The surface refractivity profiles, Ns, and refractivity extrapolated to sea level, No, obtained from surface meteorological data using both fixed and radiosonde stations are investigated and compared. The monthly and cumulative distributions of dry, wet and net components of Ns and surface meteorological parameters obtained using both fixed and radiosonde stations are also presented and compared. The obtained results are compared with ITU maps for similar propagation parameters showing non-coherence in some cases.
{"title":"Surface refractivity profile and validation of measurements in Arabian Gulf region","authors":"A. AbouAlmal, H. Alhassan, Huthaifa Obeidat, M. Abusitta, R. Abd‐Alhameed, S. Jones, H. Al-Ahmad","doi":"10.1109/LAPC.2015.7366002","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366002","url":null,"abstract":"In this paper, long-term meteorological data are measured using six fixed surface weather stations and one radiosonde in the subtropical Arabian Gulf region, in particular United Arab Emirates (UAE). The surface refractivity profiles, Ns, and refractivity extrapolated to sea level, No, obtained from surface meteorological data using both fixed and radiosonde stations are investigated and compared. The monthly and cumulative distributions of dry, wet and net components of Ns and surface meteorological parameters obtained using both fixed and radiosonde stations are also presented and compared. The obtained results are compared with ITU maps for similar propagation parameters showing non-coherence in some cases.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"21 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":"124359465","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.2015.7366022
Xingying Huo, Dawei Li, Xiaoyu Han, Junhong Wang
The effects of the structural and environmental parameters on coupling loss of leaky rectangular waveguide in tunnel are studied in this paper, the parameters include the tunnel size and the slot period of leaky waveguide. A new approach based on ray tracing method is proposed for computing the distribution of coupling loss above the upside wall of the leaky waveguide. The approach is verified by comparing the results with those of available method. The results of this paper show that the average value of the coupling loss along the leaky rectangular waveguide fluctuates with the tunnel size, and decreases with increasing of slot period, which are valuable for the design of the leaky rectangular waveguide used in Communications Based Train Control (CBTC) system.
{"title":"Effects of structural and environmental parameters on the coupling loss of leaky rectangular waveguide in tunnel","authors":"Xingying Huo, Dawei Li, Xiaoyu Han, Junhong Wang","doi":"10.1109/LAPC.2015.7366022","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366022","url":null,"abstract":"The effects of the structural and environmental parameters on coupling loss of leaky rectangular waveguide in tunnel are studied in this paper, the parameters include the tunnel size and the slot period of leaky waveguide. A new approach based on ray tracing method is proposed for computing the distribution of coupling loss above the upside wall of the leaky waveguide. The approach is verified by comparing the results with those of available method. The results of this paper show that the average value of the coupling loss along the leaky rectangular waveguide fluctuates with the tunnel size, and decreases with increasing of slot period, which are valuable for the design of the leaky rectangular waveguide used in Communications Based Train Control (CBTC) system.","PeriodicalId":339610,"journal":{"name":"2015 Loughborough Antennas & Propagation Conference (LAPC)","volume":"26 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":"121476706","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.2015.7366141
Chong Li, T. Loh, Z. Tian, Qian Xu, Yi Huang
In this paper, we inter-compare the antenna efficiency obtained from two different reverberation chambers using non-reference antenna methods in order to assess the chamber effects on the methods. A directional antenna and an omni-directional antenna are used for this study. It is found that the difference between the results is relatively small with a maximum up to around 10% within their operational frequency bands. These results demonstrate that the non-reference antenna measurement technique, especially the two-antenna method, is robust.
{"title":"A comparison of antenna efficiency measurements performed in two reverberation chambers using non-reference antenna methods","authors":"Chong Li, T. Loh, Z. Tian, Qian Xu, Yi Huang","doi":"10.1109/LAPC.2015.7366141","DOIUrl":"https://doi.org/10.1109/LAPC.2015.7366141","url":null,"abstract":"In this paper, we inter-compare the antenna efficiency obtained from two different reverberation chambers using non-reference antenna methods in order to assess the chamber effects on the methods. A directional antenna and an omni-directional antenna are used for this study. It is found that the difference between the results is relatively small with a maximum up to around 10% within their operational frequency bands. These results demonstrate that the non-reference antenna measurement technique, especially the two-antenna method, is robust.","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":"122424185","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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