Pub Date : 2010-03-01DOI: 10.1109/IWAT.2010.5464784
M.T. Ali, T. Rahman, M. Kamarudin, R. Sauleau, M. Tan, M. Jamlos
A novel structure of Reconfigurable Planar Antenna Array (RPAA) added with a microwave absorber is designed. This antenna is consists of two elements structure, which are the 16-element microstrip rectangular patch antenna structures (top structure) and the separated feed line structure (bottom structure). The unique property of this antenna design is that instead of fabricating all together in the same plane, the antenna's feeding network is separated from the antenna radiating elements (the patches) by an air gap distance. This allows reducing spurious effects from the feed line. This antenna is integrated with RF switches to produce the scanning beam pattern to desired direction. This can be done by controlling the switch state to either on or off mode. The additional material was proposed involves placing a microwave absorber material such as ECCOSORB@ (Emersion & Cuming Microwave Products, Inc., Randolph, and Mass) at the back of the top substrate. The ECCOSORB is useful for suppression of unwanted radiated field and thus improved the back lobe pattern at an average of 10 dB. The simulated results are presented to demonstrate the excellent performance of this antenna.
{"title":"A Reconfigurable Planar Antenna Array (RPAA) with back lobe reduction","authors":"M.T. Ali, T. Rahman, M. Kamarudin, R. Sauleau, M. Tan, M. Jamlos","doi":"10.1109/IWAT.2010.5464784","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464784","url":null,"abstract":"A novel structure of Reconfigurable Planar Antenna Array (RPAA) added with a microwave absorber is designed. This antenna is consists of two elements structure, which are the 16-element microstrip rectangular patch antenna structures (top structure) and the separated feed line structure (bottom structure). The unique property of this antenna design is that instead of fabricating all together in the same plane, the antenna's feeding network is separated from the antenna radiating elements (the patches) by an air gap distance. This allows reducing spurious effects from the feed line. This antenna is integrated with RF switches to produce the scanning beam pattern to desired direction. This can be done by controlling the switch state to either on or off mode. The additional material was proposed involves placing a microwave absorber material such as ECCOSORB@ (Emersion & Cuming Microwave Products, Inc., Randolph, and Mass) at the back of the top substrate. The ECCOSORB is useful for suppression of unwanted radiated field and thus improved the back lobe pattern at an average of 10 dB. The simulated results are presented to demonstrate the excellent performance of this antenna.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115524601","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464658
T. Arima, T. Uno
EBG structures have been developed widely for reducing electromagnetic coupling. On the other hand, Bistatic radar is a system which comprises a transmitter antenna and receiver antenna. In recent years, the bistatic subsurface radar is applied to detect relatively shallow structure such as tumor detection, steel reinforced detection in concrete and etc… On the other hand, the electromagnetic coupling between transmitter antenna and receiver antenna becomes problem, because, the bistatic radar detects a reflection wave from the target by the receiver antenna, therefore artifact caused by the coupling. To reduce this coupling a cavity is used, however, the cavity is not enough to reduce the electromagnetic coupling between transmitter antenna and receiver antenna. We have proposed bistatic radar system using EBG structure. In this paper, the bistatic radar system using EBG structures will be introduced briefly. And, the target detection result by using proposed bistatic radar system will be indicated.
{"title":"Low electromagnetic coupling bistatic subsurface radar using EBG structures","authors":"T. Arima, T. Uno","doi":"10.1109/IWAT.2010.5464658","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464658","url":null,"abstract":"EBG structures have been developed widely for reducing electromagnetic coupling. On the other hand, Bistatic radar is a system which comprises a transmitter antenna and receiver antenna. In recent years, the bistatic subsurface radar is applied to detect relatively shallow structure such as tumor detection, steel reinforced detection in concrete and etc… On the other hand, the electromagnetic coupling between transmitter antenna and receiver antenna becomes problem, because, the bistatic radar detects a reflection wave from the target by the receiver antenna, therefore artifact caused by the coupling. To reduce this coupling a cavity is used, however, the cavity is not enough to reduce the electromagnetic coupling between transmitter antenna and receiver antenna. We have proposed bistatic radar system using EBG structure. In this paper, the bistatic radar system using EBG structures will be introduced briefly. And, the target detection result by using proposed bistatic radar system will be indicated.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115108552","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464648
A. Derneryd, Janne Leivo, A. Stjernman, Tina Vukusic
This study implements a concept to reduce the effects of antenna coupling on efficiency, correlation, diversity gain, and Shannon capacity of two closely spaced antennas. Antenna system performance without and with different matching and compensating networks is presented. Improved performance is demonstrated in the upper 700 MHz band for an antenna element separation of 0.08 wavelengths.
{"title":"Performance improvement of closely spaced antennas incorporating a compensating network","authors":"A. Derneryd, Janne Leivo, A. Stjernman, Tina Vukusic","doi":"10.1109/IWAT.2010.5464648","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464648","url":null,"abstract":"This study implements a concept to reduce the effects of antenna coupling on efficiency, correlation, diversity gain, and Shannon capacity of two closely spaced antennas. Antenna system performance without and with different matching and compensating networks is presented. Improved performance is demonstrated in the upper 700 MHz band for an antenna element separation of 0.08 wavelengths.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123347690","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464746
Z. Šipuš, M. Bosiljevac, J. Bartolić
This paper presents different approaches for acceleration of the spectral domain analysis of large conformal antennas and arrays. The basic idea is to find suitable simplification of the original problem that can be efficiently analyzed using alternative method like Uniform Theory of Diffraction (UTD). Then by applying the asymptotic extraction technique to the spectral domain analysis method we can overcome the problems that are encountered when spectral domain method is applied to structures with dimensions large in terms of wavelength. The technique was demonstrated on several test cases showing promising results.
{"title":"Acceleration of spectral domain analysis method for conformal antennas","authors":"Z. Šipuš, M. Bosiljevac, J. Bartolić","doi":"10.1109/IWAT.2010.5464746","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464746","url":null,"abstract":"This paper presents different approaches for acceleration of the spectral domain analysis of large conformal antennas and arrays. The basic idea is to find suitable simplification of the original problem that can be efficiently analyzed using alternative method like Uniform Theory of Diffraction (UTD). Then by applying the asymptotic extraction technique to the spectral domain analysis method we can overcome the problems that are encountered when spectral domain method is applied to structures with dimensions large in terms of wavelength. The technique was demonstrated on several test cases showing promising results.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129617908","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464852
H. Nakano, T. Igarashi, Y. Iitsuka, J. Yamauchi
This paper presents an antenna that operates over a frequency range of 2.4 GHz to 10.6 GHz, such that the antenna handles both LAN and UWB frequencies. This antenna, designated as the PaSP antenna, is composed of two patches, where one is fed and the other is short-circuited to the ground plane. The design of this antenna is performed using four steps. The frequency response of the VSWR for each step is presented and discussed.
{"title":"Single wideband card antenna for LAN and UWB systems","authors":"H. Nakano, T. Igarashi, Y. Iitsuka, J. Yamauchi","doi":"10.1109/IWAT.2010.5464852","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464852","url":null,"abstract":"This paper presents an antenna that operates over a frequency range of 2.4 GHz to 10.6 GHz, such that the antenna handles both LAN and UWB frequencies. This antenna, designated as the PaSP antenna, is composed of two patches, where one is fed and the other is short-circuited to the ground plane. The design of this antenna is performed using four steps. The frequency response of the VSWR for each step is presented and discussed.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"99 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116259276","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464682
W. Tang, C. Argyropoulos, E. Kallos, Y. Hao
Current designs of electromagnetic cloaks are largely based on the use of metamaterials and a technique so-called “transformation optics/electromagnetics”. Free space cloaks require extreme materials which are difficult to implement in practice, however, the theory of “transformation optics/electromagnetics” offers a useful design tool for antenna engineers in developing novel antennas. In this paper, a method of discrete transformation is proposed, which offers us an easy way to transform the conventional devices to the all-dielectric flat ones. A flat reflector and a flat lens antenna in the free space are designed as examples. Finite-Difference Time-Domain (FDTD) method based simulation results have proved that these simply constructed all-dielectric devices have very nice performances compared with the conventional ones, while have the advantages of flat profiles and small thicknesses.
{"title":"Discrete transformation electromagnetics and its applications in antenna design","authors":"W. Tang, C. Argyropoulos, E. Kallos, Y. Hao","doi":"10.1109/IWAT.2010.5464682","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464682","url":null,"abstract":"Current designs of electromagnetic cloaks are largely based on the use of metamaterials and a technique so-called “transformation optics/electromagnetics”. Free space cloaks require extreme materials which are difficult to implement in practice, however, the theory of “transformation optics/electromagnetics” offers a useful design tool for antenna engineers in developing novel antennas. In this paper, a method of discrete transformation is proposed, which offers us an easy way to transform the conventional devices to the all-dielectric flat ones. A flat reflector and a flat lens antenna in the free space are designed as examples. Finite-Difference Time-Domain (FDTD) method based simulation results have proved that these simply constructed all-dielectric devices have very nice performances compared with the conventional ones, while have the advantages of flat profiles and small thicknesses.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127458235","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464640
Xiaojing Xu, Y. Wang
The first demonstration of a DAM transmitter with an electrically small antenna is presented in this paper. Traditionally efficiency-bandwidth product of an electrically small radiation system is inversely proportional to radiation Q of the antenna, which is high in nature according to radiation wave properties. However, a DAM transmitter operates in time-variant mode so that its efficiency-bandwidth product is not limited by Q. The key to improve the efficiency-bandwidth product is to decouple far-field radiation energy from near-field reactive energy. In DAM scheme, far field radiation is directly turned on and off to represent information, while a maximum reactive energy is circulated within system to enhance efficiency-bandwidth performance. To prove the concept, a traditional and a DAM transmitter have been tested and compared under the same condition. Results show that information tone received from the DAM transmitter is significantly higher in magnitude when signal bandwidth exceeds bandwidth of the traditional transmitter.
{"title":"A direct antenna modulation (DAM) transmitter with a switched electrically small antenna","authors":"Xiaojing Xu, Y. Wang","doi":"10.1109/IWAT.2010.5464640","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464640","url":null,"abstract":"The first demonstration of a DAM transmitter with an electrically small antenna is presented in this paper. Traditionally efficiency-bandwidth product of an electrically small radiation system is inversely proportional to radiation Q of the antenna, which is high in nature according to radiation wave properties. However, a DAM transmitter operates in time-variant mode so that its efficiency-bandwidth product is not limited by Q. The key to improve the efficiency-bandwidth product is to decouple far-field radiation energy from near-field reactive energy. In DAM scheme, far field radiation is directly turned on and off to represent information, while a maximum reactive energy is circulated within system to enhance efficiency-bandwidth performance. To prove the concept, a traditional and a DAM transmitter have been tested and compared under the same condition. Results show that information tone received from the DAM transmitter is significantly higher in magnitude when signal bandwidth exceeds bandwidth of the traditional transmitter.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"109 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130660558","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464761
B. Kolundžija, B. Mrdakovic
In this paper, a new method for analysis of space coverage in UHF RFID systems is presented. The method is based on EM modeling of tags and reader antennas in desired RFID environment and post-processing of near field data taking into account arbitrary positions and orientations of tags. The method is illustrated for a case when collection of objects pass through the concrete gateway using one to three reader antennas in “AND” and “OR” scenario.
{"title":"Analysis of space coverage in far field UHF RFID systems","authors":"B. Kolundžija, B. Mrdakovic","doi":"10.1109/IWAT.2010.5464761","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464761","url":null,"abstract":"In this paper, a new method for analysis of space coverage in UHF RFID systems is presented. The method is based on EM modeling of tags and reader antennas in desired RFID environment and post-processing of near field data taking into account arbitrary positions and orientations of tags. The method is illustrated for a case when collection of objects pass through the concrete gateway using one to three reader antennas in “AND” and “OR” scenario.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130736952","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464804
M. Sierra-Castañer, F. Cano, S. Burgos, J. Besada
This paper shows several applications of the diagnostic techniques for the reduction of some error or uncertainty factors in antenna measurements. The method is based in the calculation of the extremely near field from the far field using FFT (Fast Fourier Transform) Techniques, improved with the Gerchberg-Papoulis Algorithm. The classical applications of the diagnostic techniques are errors detection, like phase errors in arrays or conformal errors in reflectors. Therefore, they constitute an important antenna design tool. Also, they can be used for other applications whose aim is improve the measurements in anechoic chambers. This paper shows different process applied to reduce the effect of the reflections, the effect of the leakage from AUT (Antenna under test), to improve the signal to noise and to reduce the truncation error in the planar or cylindrical near field.
{"title":"Applications of the diagnosis techniques in antenna for the reduction of the measurements errors","authors":"M. Sierra-Castañer, F. Cano, S. Burgos, J. Besada","doi":"10.1109/IWAT.2010.5464804","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464804","url":null,"abstract":"This paper shows several applications of the diagnostic techniques for the reduction of some error or uncertainty factors in antenna measurements. The method is based in the calculation of the extremely near field from the far field using FFT (Fast Fourier Transform) Techniques, improved with the Gerchberg-Papoulis Algorithm. The classical applications of the diagnostic techniques are errors detection, like phase errors in arrays or conformal errors in reflectors. Therefore, they constitute an important antenna design tool. Also, they can be used for other applications whose aim is improve the measurements in anechoic chambers. This paper shows different process applied to reduce the effect of the reflections, the effect of the leakage from AUT (Antenna under test), to improve the signal to noise and to reduce the truncation error in the planar or cylindrical near field.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130834258","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464975
Pramod Kumar.M, Sravan Kumar, R. Jyoti, V. Reddy, P. Rao
In order to meet the miniaturization of portable communication equipment, researchers have given much attention recently to compact microstrip antennas. Conventional microstrip antennas in general have a conducting patch printed on a grounded microwave substrate, and have the attractive features of low profiles, light weight, easy fabrication, and conformability to mounting hosts. However, microstrip antennas inherently have a narrow bandwidth, and bandwidth enhancement is usually demanded for practical applications. Thus, the present paper discusses about the novel design for compact and broadband microstrip antennas. The bandwidth of the designed antenna is enhanced by reactively loading with slots symmetrically to one of the axis. The antenna was designed for operating in S band (1.9 – 2.4 GHz) frequency range with a linear polarization. The feeding arrangement exhibited in the designed model is coaxial connector in the ground plane with the centerpin extended to the patch as an inductive probe although other feeding methods could be easily adapted. The designed antenna successfully attains a bandwidth of 24.5% at 10dB return loss with the central frequency of 2.1 GHz; also the antenna attains a gain of 9.1dB at its resonant frequency. The simulated 3dB beamwidth is of about 110 and 98.2 in E-plane and H-plane respectively. The antenna was designed using High frequency simulation software Ansoft Designer 4.0.
{"title":"Novel structural design for compact and broadband patch antenna","authors":"Pramod Kumar.M, Sravan Kumar, R. Jyoti, V. Reddy, P. Rao","doi":"10.1109/IWAT.2010.5464975","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464975","url":null,"abstract":"In order to meet the miniaturization of portable communication equipment, researchers have given much attention recently to compact microstrip antennas. Conventional microstrip antennas in general have a conducting patch printed on a grounded microwave substrate, and have the attractive features of low profiles, light weight, easy fabrication, and conformability to mounting hosts. However, microstrip antennas inherently have a narrow bandwidth, and bandwidth enhancement is usually demanded for practical applications. Thus, the present paper discusses about the novel design for compact and broadband microstrip antennas. The bandwidth of the designed antenna is enhanced by reactively loading with slots symmetrically to one of the axis. The antenna was designed for operating in S band (1.9 – 2.4 GHz) frequency range with a linear polarization. The feeding arrangement exhibited in the designed model is coaxial connector in the ground plane with the centerpin extended to the patch as an inductive probe although other feeding methods could be easily adapted. The designed antenna successfully attains a bandwidth of 24.5% at 10dB return loss with the central frequency of 2.1 GHz; also the antenna attains a gain of 9.1dB at its resonant frequency. The simulated 3dB beamwidth is of about 110 and 98.2 in E-plane and H-plane respectively. The antenna was designed using High frequency simulation software Ansoft Designer 4.0.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"253 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133583669","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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