Pub Date : 2018-09-26DOI: 10.1109/IWAT.2017.7915359
T. Vaupel
In this contribution, a combined electric field/magnetic field surface/volume integral equation approach is presented with special features for the characterization of substrate integrated waveguide (SIW) components. Due to the use of a parallel plate waveguide Green's function, only a small number of volume current basis functions are necessary to model the SIWs. The focal point is set on the specification of microstrip line-SIW transitions using a via and a pad/antipad configuration for the coupling between the microstrip parts and the SIW. An effective S-parameter extraction is used with both microstrip- and special SIW-waveguide ports. The main goal comprises the design of cheap broadband transitions to SIWs with a thick substrate suited for the feeding of a new class of compact endfire SIW-antennas.
{"title":"A combined electric/magnetic field surface volume integral equation approach for the fast characterization of microstrip/substrate integrated waveguide structures","authors":"T. Vaupel","doi":"10.1109/IWAT.2017.7915359","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915359","url":null,"abstract":"In this contribution, a combined electric field/magnetic field surface/volume integral equation approach is presented with special features for the characterization of substrate integrated waveguide (SIW) components. Due to the use of a parallel plate waveguide Green's function, only a small number of volume current basis functions are necessary to model the SIWs. The focal point is set on the specification of microstrip line-SIW transitions using a via and a pad/antipad configuration for the coupling between the microstrip parts and the SIW. An effective S-parameter extraction is used with both microstrip- and special SIW-waveguide ports. The main goal comprises the design of cheap broadband transitions to SIWs with a thick substrate suited for the feeding of a new class of compact endfire SIW-antennas.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123493189","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 : 2017-05-01DOI: 10.1109/IWAT.2017.7915381
Yomna El-Saboni, G. Conway, W. Scanlon
A study of the intra-body propagation channel between two identical tissue implanted antennas is presented. To investigate the effect of the tissue boundaries, the channel between the two implants is evaluated within a tissue layered numerical phantom with both insulated and un-insulated antenna structures in the MedRadio operating band (2.36–2.40 GHz). The results demonstrate how wave propagation between the antennas inside the same block of tissue is largely unaffected by changes in the peripheral surrounding tissues, irrespective of their material characteristics. On the contrary, propagation across tissue boundaries is affected by the boundary and the path distance within each tissue according to the dielectric parameters involved.
{"title":"Effect of tissue boundaries on the intra-body communication channel at 2.38 GHz","authors":"Yomna El-Saboni, G. Conway, W. Scanlon","doi":"10.1109/IWAT.2017.7915381","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915381","url":null,"abstract":"A study of the intra-body propagation channel between two identical tissue implanted antennas is presented. To investigate the effect of the tissue boundaries, the channel between the two implants is evaluated within a tissue layered numerical phantom with both insulated and un-insulated antenna structures in the MedRadio operating band (2.36–2.40 GHz). The results demonstrate how wave propagation between the antennas inside the same block of tissue is largely unaffected by changes in the peripheral surrounding tissues, irrespective of their material characteristics. On the contrary, propagation across tissue boundaries is affected by the boundary and the path distance within each tissue according to the dielectric parameters involved.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131981139","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 : 2017-04-28DOI: 10.1109/IWAT.2017.7915399
R. Maximidis, A. B. Smolders, G. Toso, D. Caratelli
The goal of this paper is to show that a reactively loaded antenna is able to provide maximum directivity similar to the one featured by a uniformly excited array featuring the same physical aperture. In particular, it is shown that the superdirectivity behavior of such an antenna can be achieved without compromising the relevant radiation efficiency.
{"title":"Gain enhancement of reactively loaded aperture antennas","authors":"R. Maximidis, A. B. Smolders, G. Toso, D. Caratelli","doi":"10.1109/IWAT.2017.7915399","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915399","url":null,"abstract":"The goal of this paper is to show that a reactively loaded antenna is able to provide maximum directivity similar to the one featured by a uniformly excited array featuring the same physical aperture. In particular, it is shown that the superdirectivity behavior of such an antenna can be achieved without compromising the relevant radiation efficiency.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116289308","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 : 2017-04-28DOI: 10.1109/IWAT.2017.7915360
A. Koutinos, G. Ioannopoulos, M. Chryssomallis, G. Kyriacou, D. Caratelli
The technique of multiple points feeding in order to achieve improved bandwidth performance is here exploited and used to feed a supershape structured radiator. The achieved operating bandwidth, is an important advancement compared to the performance of the usual, single fed and regularly shaped patch antennas. The proposed antenna operates from 2.5 to 3.9 GHz with linear polarization and its behavior is investigated in terms of Return Loss, VSWR, input impedance, radiation pattern, electric field and efficiency.
{"title":"Bandwidth enhancement of a supershape patch antenna using multiple feeding technique","authors":"A. Koutinos, G. Ioannopoulos, M. Chryssomallis, G. Kyriacou, D. Caratelli","doi":"10.1109/IWAT.2017.7915360","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915360","url":null,"abstract":"The technique of multiple points feeding in order to achieve improved bandwidth performance is here exploited and used to feed a supershape structured radiator. The achieved operating bandwidth, is an important advancement compared to the performance of the usual, single fed and regularly shaped patch antennas. The proposed antenna operates from 2.5 to 3.9 GHz with linear polarization and its behavior is investigated in terms of Return Loss, VSWR, input impedance, radiation pattern, electric field and efficiency.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127982507","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 : 2017-04-28DOI: 10.1109/IWAT.2017.7915373
Q. Liao, Z. Ying, Carl Gustafson
There are many different frequency bands above 6 GHz and into the mm-wave range above 30 GHz that are possible candidates for use in future 5G cellular systems. In this paper, we present some results for wireless channels at 15 and 28 GHz in an indoor scenario. The results are based on both measurements and ray tracing simulations. Basic comparisons of measured and simulated power-delay profiles, angle of departure and received power are presented to give an insight to the possibilities and limitations of utilizing ray tracing to characterize the indoor wireless channel at 15 and 28 GHz. We show that it is important to consider human body shadowing as well as finer structures and details in the ray tracing environment model in order to achieve reasonable results. Lastly, we also perform ray tracing simulations to assess the performance of a number of different array signal processing techniques, including beamforming, hybrid beamforming and spatial multiplexing.
{"title":"Simulations and measurements of 15 and 28 GHz indoor channels with different array configurations","authors":"Q. Liao, Z. Ying, Carl Gustafson","doi":"10.1109/IWAT.2017.7915373","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915373","url":null,"abstract":"There are many different frequency bands above 6 GHz and into the mm-wave range above 30 GHz that are possible candidates for use in future 5G cellular systems. In this paper, we present some results for wireless channels at 15 and 28 GHz in an indoor scenario. The results are based on both measurements and ray tracing simulations. Basic comparisons of measured and simulated power-delay profiles, angle of departure and received power are presented to give an insight to the possibilities and limitations of utilizing ray tracing to characterize the indoor wireless channel at 15 and 28 GHz. We show that it is important to consider human body shadowing as well as finer structures and details in the ray tracing environment model in order to achieve reasonable results. Lastly, we also perform ray tracing simulations to assess the performance of a number of different array signal processing techniques, including beamforming, hybrid beamforming and spatial multiplexing.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121598895","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915400
J. Ziegler, A. Zadehgol
One benefit of electrically small antennas is the reduction in volume occupied by the antenna in a design. In order to further maximize the total volume afforded to the antenna, this paper investigates the impact of two different antenna core compositions that allow for circuit components to be placed within the antenna structure. An electrically small, hemispherical helix antenna realized through a stack of printed circuit boards has been evaluated with two different core configurations: an air core and a composite metal core. The composite metal core consists of both air and copper in order to achieve an integral Faraday cage, which is used to isolate the antenna from the components within the antenna structure.
{"title":"Electrically small PCB stack hemispherical helix antenna with air core","authors":"J. Ziegler, A. Zadehgol","doi":"10.1109/IWAT.2017.7915400","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915400","url":null,"abstract":"One benefit of electrically small antennas is the reduction in volume occupied by the antenna in a design. In order to further maximize the total volume afforded to the antenna, this paper investigates the impact of two different antenna core compositions that allow for circuit components to be placed within the antenna structure. An electrically small, hemispherical helix antenna realized through a stack of printed circuit boards has been evaluated with two different core configurations: an air core and a composite metal core. The composite metal core consists of both air and copper in order to achieve an integral Faraday cage, which is used to isolate the antenna from the components within the antenna structure.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"434 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126100609","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}
This paper proposes a novel multi-stub ultra-wide band planar monopole antenna. The radiation patch of the antenna is composed of a pair of back-to-back E-shape-like stub elements. The E-shape-like stub element is the extension of the E-shape stub element, adding two semi-circle elements at the back of the E-shape stub element and extending the top of the E-shape stub element with an inverted L-shape element with a “suspending hammer” element. Two semi-circle slots etched on the rectangular ground which is extended make the ground with two step-like structures to realize ultra-wideband. The antenna is printed on a substrate of the dielectric constant 4.6. The experiment results show that the bandwidth of the antenna is 3.2GHz–18.7GHz for S11 of less than −10dB.
{"title":"A novel multiple-stub ultra-wide band antenna","authors":"Yanni Cui, Qiong Zhou, Xiupu Zhang, Dongya Shen, Yanghao Zhou","doi":"10.1109/IWAT.2017.7915365","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915365","url":null,"abstract":"This paper proposes a novel multi-stub ultra-wide band planar monopole antenna. The radiation patch of the antenna is composed of a pair of back-to-back E-shape-like stub elements. The E-shape-like stub element is the extension of the E-shape stub element, adding two semi-circle elements at the back of the E-shape stub element and extending the top of the E-shape stub element with an inverted L-shape element with a “suspending hammer” element. Two semi-circle slots etched on the rectangular ground which is extended make the ground with two step-like structures to realize ultra-wideband. The antenna is printed on a substrate of the dielectric constant 4.6. The experiment results show that the bandwidth of the antenna is 3.2GHz–18.7GHz for S11 of less than −10dB.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115560191","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915318
Nebil Kristou, J. Pintos, K. Mahdjoubi
In this paper, an alternative technique is proposed to miniaturize the Artificial Magnetic Conductors (AMC) unit cell. Novel unit cell achieves 60% surface size reduction at the same operating frequency compared to conventional mushroom-like unit cell. An AMC surface of 5×5 cells is designed under a dipole antenna with a distance of 0.05λ0, where λ0 denotes the free space wavelength at 0.9 GHz, for gain enhancement and radiation control. Both the dipole antenna and the AMC surface are fabricated and measured to demonstrate the potential of this new structure. At 0.92 GHz, a peak realized gain of 4.3 dBi of the antenna is achieved. The front-to-back ratio is under −15 dB and the maximum cross-polarization level, in the main beam, is less than −25 dB for both E and H plane. The simulated and the measured results are in good agreement.
{"title":"Low profile dipole antenna over compact AMC surface","authors":"Nebil Kristou, J. Pintos, K. Mahdjoubi","doi":"10.1109/IWAT.2017.7915318","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915318","url":null,"abstract":"In this paper, an alternative technique is proposed to miniaturize the Artificial Magnetic Conductors (AMC) unit cell. Novel unit cell achieves 60% surface size reduction at the same operating frequency compared to conventional mushroom-like unit cell. An AMC surface of 5×5 cells is designed under a dipole antenna with a distance of 0.05λ0, where λ0 denotes the free space wavelength at 0.9 GHz, for gain enhancement and radiation control. Both the dipole antenna and the AMC surface are fabricated and measured to demonstrate the potential of this new structure. At 0.92 GHz, a peak realized gain of 4.3 dBi of the antenna is achieved. The front-to-back ratio is under −15 dB and the maximum cross-polarization level, in the main beam, is less than −25 dB for both E and H plane. The simulated and the measured results are in good agreement.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122480600","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915352
Yuxiao He, Christopher Oakley, P. Chahal, J. Albrecht, J. Papapolymerou
This paper presents an Aerosol Jet printed end-fire antenna operating at 24 GHz on a 3-D printed substrate for the first time. A compact quasi-Yagi-Uda antenna is chosen to achieve end-fire radiation pattern, and is optimized to be directly fed by a 50 Ω microstrip transmission line (MTL) with a balun. The partially metalized substrate serves as the ground plane for the mcirostrip line as well as the reflector for the quasi-Yagi-Uda antenna. Additionally, a cavity is integrated in the back of the substrate to provide low loss, high gain and good efficiency. The simulated performance shows 26.4 dB return loss at 24 GHz, 3.32 dBi of peak gain and 57.7% radiation efficiency. The measurements are carried out over a frequency range of 20 – 30 GHz with the return loss of 14.6 dB at 25.8 GHz. The combination of Aerosol Jet printing and 3-D Polyjet printing processes in this paper demonstrates a good advantage of additive manufacturing technology, which allows for highly efficient fabrication of low-profile antennas and other novel RF circuits.
{"title":"Aerosol Jet printed 24 GHz end-fire quasi-Yagi-Uda antenna on a 3-D printed cavity substrate","authors":"Yuxiao He, Christopher Oakley, P. Chahal, J. Albrecht, J. Papapolymerou","doi":"10.1109/IWAT.2017.7915352","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915352","url":null,"abstract":"This paper presents an Aerosol Jet printed end-fire antenna operating at 24 GHz on a 3-D printed substrate for the first time. A compact quasi-Yagi-Uda antenna is chosen to achieve end-fire radiation pattern, and is optimized to be directly fed by a 50 Ω microstrip transmission line (MTL) with a balun. The partially metalized substrate serves as the ground plane for the mcirostrip line as well as the reflector for the quasi-Yagi-Uda antenna. Additionally, a cavity is integrated in the back of the substrate to provide low loss, high gain and good efficiency. The simulated performance shows 26.4 dB return loss at 24 GHz, 3.32 dBi of peak gain and 57.7% radiation efficiency. The measurements are carried out over a frequency range of 20 – 30 GHz with the return loss of 14.6 dB at 25.8 GHz. The combination of Aerosol Jet printing and 3-D Polyjet printing processes in this paper demonstrates a good advantage of additive manufacturing technology, which allows for highly efficient fabrication of low-profile antennas and other novel RF circuits.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129876833","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915346
Adel Y. I. Ashyap, Z. Abidin, S. Dahlan, H. Majid, M. Kamarudin, R. Abd‐Alhameed
A low-profile electromagnetic band-gap enabled textile wearable antenna covering the spectrum between the 2.36 and 2.40 GHz of the new released medical wireless body networks (MBANs), is presented. The integrated EBG with the proposed antenna reduces the radiation intensity into the human tissues around 13 dB; and also decreases the effect of frequency detuning. The antenna structure is compact size with total volume of 54 × 54 × 3.1 mm3. It offers 8.5% impedance bandwidth and a power gain of 6.79 dBi. Specific absorption rate (SAR) evaluation is also carried out to validate the performance of the antenna when it is placed closely to human body. The antenna size and its ultimate performances could be selected as a good candidate for integration into various wearable devices.
{"title":"Robust low-profile electromagnetic band-gap-based on textile wearable antennas for medical application","authors":"Adel Y. I. Ashyap, Z. Abidin, S. Dahlan, H. Majid, M. Kamarudin, R. Abd‐Alhameed","doi":"10.1109/IWAT.2017.7915346","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915346","url":null,"abstract":"A low-profile electromagnetic band-gap enabled textile wearable antenna covering the spectrum between the 2.36 and 2.40 GHz of the new released medical wireless body networks (MBANs), is presented. The integrated EBG with the proposed antenna reduces the radiation intensity into the human tissues around 13 dB; and also decreases the effect of frequency detuning. The antenna structure is compact size with total volume of 54 × 54 × 3.1 mm3. It offers 8.5% impedance bandwidth and a power gain of 6.79 dBi. Specific absorption rate (SAR) evaluation is also carried out to validate the performance of the antenna when it is placed closely to human body. The antenna size and its ultimate performances could be selected as a good candidate for integration into various wearable devices.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130233514","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：