Pub Date : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021416
Jianfeng Wei, Sai Guo, Yun He, Qian Chen, Ning Zhao, S. Bie, Jianjun Jiang
Frequency selective surface (FSS) has extensively been investigated over the past decades. The most famous applications of FSS are used for antennas radome and controlling radar cross section (RCS). FSS radome could reflect the signal out of the band so that the RCS could be reduced by shaping. However, with the development of radar detection technology, the scattering out of the band becomes non-negligible. In order to improve the problem, the FSS rasorber was proposed. It is the combination of the absorber and the radome. In this paper, a wideband transmission FSS rasorber is designed, acting as a stealthy radome to reduce the scattering out of band of the antenna system. The rasorber consists of an absorption layer (LayerA) and a transmission layer (LayerT). The LayerA, which use a resistor-loaded in Jerusalem cross element with non-touching centre, provides stable losses out of band and minimizes losses in the band. The LayerT use as the ground plane of an absorber based on the absorption layer within the total reflection band and providing a transmission window in the band. In order to obtain a wideband transmission, two series chokes are inserted in each leg in the LayerA and the LayerT adopts a second-order resonator. Moreover, the elements are packed densely owing to a skewed grid in the LayerA and the miniaturized non-resonant element in the LayerT. Superdense arrays cause a more stable performance of the rasorber, especially the delay of grating lobes onset. The composite structure is thoroughly analyzed by means of the full-wave numerical simulation. The simulation shows that the –1 dB transmission window is 5.7 ~ 6.7 GHz, and the –10dB reflection band is 2.2 ~ 5.1 GHz. The design would be widely used in broadband antenna system.
{"title":"A Wideband Transmission Frequency Selective Surface Rasorber","authors":"Jianfeng Wei, Sai Guo, Yun He, Qian Chen, Ning Zhao, S. Bie, Jianjun Jiang","doi":"10.1109/PIERS-Fall48861.2019.9021416","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021416","url":null,"abstract":"Frequency selective surface (FSS) has extensively been investigated over the past decades. The most famous applications of FSS are used for antennas radome and controlling radar cross section (RCS). FSS radome could reflect the signal out of the band so that the RCS could be reduced by shaping. However, with the development of radar detection technology, the scattering out of the band becomes non-negligible. In order to improve the problem, the FSS rasorber was proposed. It is the combination of the absorber and the radome. In this paper, a wideband transmission FSS rasorber is designed, acting as a stealthy radome to reduce the scattering out of band of the antenna system. The rasorber consists of an absorption layer (LayerA) and a transmission layer (LayerT). The LayerA, which use a resistor-loaded in Jerusalem cross element with non-touching centre, provides stable losses out of band and minimizes losses in the band. The LayerT use as the ground plane of an absorber based on the absorption layer within the total reflection band and providing a transmission window in the band. In order to obtain a wideband transmission, two series chokes are inserted in each leg in the LayerA and the LayerT adopts a second-order resonator. Moreover, the elements are packed densely owing to a skewed grid in the LayerA and the miniaturized non-resonant element in the LayerT. Superdense arrays cause a more stable performance of the rasorber, especially the delay of grating lobes onset. The composite structure is thoroughly analyzed by means of the full-wave numerical simulation. The simulation shows that the –1 dB transmission window is 5.7 ~ 6.7 GHz, and the –10dB reflection band is 2.2 ~ 5.1 GHz. The design would be widely used in broadband antenna system.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133444337","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021471
Shuo Yang, Guanmao Zhang, Jiali Ru, G. Fan, Mingyang Zhai
A compact patch ultra-wideband (UWB) antenna with a novel fractal structure is proposed in this paper. The patch shape of the antenna is based on a hexagonal ring. Minkowski fractals and Koch fractals are used for the outer and inner edges of the hexagonal ring, respectively. Thus, the size reduction and bandwidth increase of the patch antenna are achieved. The final antenna covers a wide frequency range of 2.7GHz to 8.75GHz at a size of 35.5mm × 34mm. By comparing the results of using Minkowski fractal and Koch fractal respectively, the advantages of the combined fractal structure proposed in this paper are further clarified. Optimize the effect of the UWB antenna by adjusting the shape of the ground plane. Through actual measurement, the compact UWB patch antenna with fractal structure has good performance, and the use of the FR4 dielectric substrate makes the antenna low-cost and easy to manufacture, which meets the actual needs.
{"title":"Novel Hexagonal Ring Compact Patch UWB Antenna Design Based on Minkowski and Koch Fractal Combination Structure","authors":"Shuo Yang, Guanmao Zhang, Jiali Ru, G. Fan, Mingyang Zhai","doi":"10.1109/PIERS-Fall48861.2019.9021471","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021471","url":null,"abstract":"A compact patch ultra-wideband (UWB) antenna with a novel fractal structure is proposed in this paper. The patch shape of the antenna is based on a hexagonal ring. Minkowski fractals and Koch fractals are used for the outer and inner edges of the hexagonal ring, respectively. Thus, the size reduction and bandwidth increase of the patch antenna are achieved. The final antenna covers a wide frequency range of 2.7GHz to 8.75GHz at a size of 35.5mm × 34mm. By comparing the results of using Minkowski fractal and Koch fractal respectively, the advantages of the combined fractal structure proposed in this paper are further clarified. Optimize the effect of the UWB antenna by adjusting the shape of the ground plane. Through actual measurement, the compact UWB patch antenna with fractal structure has good performance, and the use of the FR4 dielectric substrate makes the antenna low-cost and easy to manufacture, which meets the actual needs.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132139231","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}
An ultra-thin polarization insensitive plasmon-induced transparency (PIT) is proposed in this article. The height (t) of this PIT meta-materials can be the thinnest so far (reach to 1/90λ), due to the strong magnetic coupling between the top and below layers. This method makes it easy to fabricate the meta-materials with low profile and satisfying performances. We can also obtain variety of group indices and transmissive peaks by adjusting the height of the PIT structure. Furthermore, the PIT transmissive spectrum under the orthogonal polarized incident electromagnetic (EM) wave are identical, which is attributed to the PIT meta-material’s center symmetrical. Finally, we conduct simulations and analysis based on the Lorentz oscillator model. These results obtained by the different techniques were in good agreement. All of above properties make this ultra-thin PIT have potential application in compact slow light devices.
{"title":"Ultra-thin Polarization-insensitive Plasmon-induced Transparency Metamaterials","authors":"F. Xue, Shaobin Liu, Hai-Ming Li, X. Kong, Lingling Wang, Xuewei Zhang","doi":"10.1109/PIERS-Fall48861.2019.9021859","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021859","url":null,"abstract":"An ultra-thin polarization insensitive plasmon-induced transparency (PIT) is proposed in this article. The height (t) of this PIT meta-materials can be the thinnest so far (reach to 1/90λ), due to the strong magnetic coupling between the top and below layers. This method makes it easy to fabricate the meta-materials with low profile and satisfying performances. We can also obtain variety of group indices and transmissive peaks by adjusting the height of the PIT structure. Furthermore, the PIT transmissive spectrum under the orthogonal polarized incident electromagnetic (EM) wave are identical, which is attributed to the PIT meta-material’s center symmetrical. Finally, we conduct simulations and analysis based on the Lorentz oscillator model. These results obtained by the different techniques were in good agreement. All of above properties make this ultra-thin PIT have potential application in compact slow light devices.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132577153","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021554
Lei Wang, Kai Xu, Jin Shi
Filtering antennas have been achieved more attention for the advantages of reducing the requirement of the filter in wireless communication systems. The radiation nulls of filtering antenna can further improve the frequency selectivity and decrease the mutual coupling between the closely placed antennas operating at different frequencies so that the placement distance of the antennas can be decreased. Therefore, various methods for generating radiation null have been investigated. One is to use cross-coupling or electromagnetic hybrid coupling of filtering theory. The other is to generate transmission zero by feed structure, which is a radiation null for the whole antenna. The last one is to achieve the radiation null by the radiator structure, which will produce a field that cancels each other out. In this paper, two filtering antennas with radiation nulls are reviewed to introduce the methods for radiation nulls. One is the dual-polarized filtering patch antenna fed by substrate integrated cavity (SIC). The second-order filtering response is achieved by using one SIC resonator and one slotted square patch while the radiation nulls can be produced by connecting the coupled lines with feeding lines in parallel. The other is a circular dense dielectric (DD) patch antenna realized by stacking an upper DD patch on the lower DD patch. The two reflection zeros are achieved because the dual DD patches are both operating at TM11 mode. The two radiation nulls near the lower band-edge are produced by the opposite E-field distribution inside the upper DD patch and the quarter-wavelength open-circuit stub, while the two radiation nulls near the upper band-edge are produced by the opposite E-field distribution inside the lower DD patch and the opposite E-field distribution at the edges of the two DD patches. The performances of the two designs are given.
{"title":"The Methods for Generating Radiation Null in Filtering Antennas","authors":"Lei Wang, Kai Xu, Jin Shi","doi":"10.1109/PIERS-Fall48861.2019.9021554","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021554","url":null,"abstract":"Filtering antennas have been achieved more attention for the advantages of reducing the requirement of the filter in wireless communication systems. The radiation nulls of filtering antenna can further improve the frequency selectivity and decrease the mutual coupling between the closely placed antennas operating at different frequencies so that the placement distance of the antennas can be decreased. Therefore, various methods for generating radiation null have been investigated. One is to use cross-coupling or electromagnetic hybrid coupling of filtering theory. The other is to generate transmission zero by feed structure, which is a radiation null for the whole antenna. The last one is to achieve the radiation null by the radiator structure, which will produce a field that cancels each other out. In this paper, two filtering antennas with radiation nulls are reviewed to introduce the methods for radiation nulls. One is the dual-polarized filtering patch antenna fed by substrate integrated cavity (SIC). The second-order filtering response is achieved by using one SIC resonator and one slotted square patch while the radiation nulls can be produced by connecting the coupled lines with feeding lines in parallel. The other is a circular dense dielectric (DD) patch antenna realized by stacking an upper DD patch on the lower DD patch. The two reflection zeros are achieved because the dual DD patches are both operating at TM11 mode. The two radiation nulls near the lower band-edge are produced by the opposite E-field distribution inside the upper DD patch and the quarter-wavelength open-circuit stub, while the two radiation nulls near the upper band-edge are produced by the opposite E-field distribution inside the lower DD patch and the opposite E-field distribution at the edges of the two DD patches. The performances of the two designs are given.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132730930","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021664
Cheng-Nan Hu, Alfred Tsai, Kwo-Jyr Wong, P. Lo
Estimating the entire channel state information (CSI) is essential for building and keeping a robust RF link between a master device and the mobile-station and base-station in a wireless transmission system. The channel sounding system can be used to evaluate the radio environment for wireless communication to take account the effect of terrain and obstacles, wireless signals propagate in multiple paths (the multipath effect). In a multipath system, the wireless channel is frequency dependent, time dependent, and position dependent. The parameters describe the channel in a multipath system [1], including direction of departure (DOD), direction of arrival (DOA), time delay, Doppler shift, and complex polarimetry path weight matrix. Generally Space-Alternating Generalized Expectation Maximization (SAGE) algorithm [2] or the Multiple Signal Classification (MUSIC) estimation algorithm [3] can be used to estimate the angle information but those methods demand a MCPU with highly computing power. To reduce the computing load, this study proposes the use of monopulse [4] tracking algorithm for angle estimation. Numerical simulation results validate the proposed method.
{"title":"Angle Estimation through Millimeter Wave MIMO in 5G Systems","authors":"Cheng-Nan Hu, Alfred Tsai, Kwo-Jyr Wong, P. Lo","doi":"10.1109/PIERS-Fall48861.2019.9021664","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021664","url":null,"abstract":"Estimating the entire channel state information (CSI) is essential for building and keeping a robust RF link between a master device and the mobile-station and base-station in a wireless transmission system. The channel sounding system can be used to evaluate the radio environment for wireless communication to take account the effect of terrain and obstacles, wireless signals propagate in multiple paths (the multipath effect). In a multipath system, the wireless channel is frequency dependent, time dependent, and position dependent. The parameters describe the channel in a multipath system [1], including direction of departure (DOD), direction of arrival (DOA), time delay, Doppler shift, and complex polarimetry path weight matrix. Generally Space-Alternating Generalized Expectation Maximization (SAGE) algorithm [2] or the Multiple Signal Classification (MUSIC) estimation algorithm [3] can be used to estimate the angle information but those methods demand a MCPU with highly computing power. To reduce the computing load, this study proposes the use of monopulse [4] tracking algorithm for angle estimation. Numerical simulation results validate the proposed method.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131407335","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021313
T. Fathima, Vasudevan Nedumpozhimana, Y. Lee, Stefan Winkler, Soumyabrata Dev
Solar irradiance is the primary input for all solar energy generation systems. The amount of available solar radiation over time under the local weather conditions helps to decide the optimal location, technology and size of a solar energy project. We study the behaviour of incident solar irradiance on the earth’s surface using weather sensors. In this paper, we propose a time-series based technique to forecast the solar irradiance values for shorter lead times of upto 15 minutes. Our experiments are conducted in the tropical region viz. Singapore, which receives a large amount of solar irradiance throughout the year. We benchmark our method with two common forecasting techniques, namely persistence model and average model, and we obtain good prediction performance. We report a root mean square of 147 W/m2 for a lead time of 15 minutes.
{"title":"Predicting Solar Irradiance in Singapore","authors":"T. Fathima, Vasudevan Nedumpozhimana, Y. Lee, Stefan Winkler, Soumyabrata Dev","doi":"10.1109/PIERS-Fall48861.2019.9021313","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021313","url":null,"abstract":"Solar irradiance is the primary input for all solar energy generation systems. The amount of available solar radiation over time under the local weather conditions helps to decide the optimal location, technology and size of a solar energy project. We study the behaviour of incident solar irradiance on the earth’s surface using weather sensors. In this paper, we propose a time-series based technique to forecast the solar irradiance values for shorter lead times of upto 15 minutes. Our experiments are conducted in the tropical region viz. Singapore, which receives a large amount of solar irradiance throughout the year. We benchmark our method with two common forecasting techniques, namely persistence model and average model, and we obtain good prediction performance. We report a root mean square of 147 W/m2 for a lead time of 15 minutes.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127407560","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021816
W. Kang, Guo Chun Wan, M. Tong
The three primary-color LED light source modules produce a color within the gamut space by the Pulse-Width-Modulation (PWM) duty cycle. In a host control multiple LED module system, due to the specificity of the three primary-color LED light sources, different light source modules cannot generate the same target color coordinates according to the same set of duty ratio data, thereby causing a color inconsistency in each light source. This paper proposes an algorithm for personalizing the Red-Green-Blue (RGB) values by using the three primary-color coordinates obtained by feedbacks. Through extensive experiments, the algorithm can effectively reduce the color difference produced by different LED lamp beads. The algorithm has a small amount of calculation and can be easily implemented in practical devices.
{"title":"A Color Compensation Method for Three Primary-color LED Light Sources","authors":"W. Kang, Guo Chun Wan, M. Tong","doi":"10.1109/PIERS-Fall48861.2019.9021816","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021816","url":null,"abstract":"The three primary-color LED light source modules produce a color within the gamut space by the Pulse-Width-Modulation (PWM) duty cycle. In a host control multiple LED module system, due to the specificity of the three primary-color LED light sources, different light source modules cannot generate the same target color coordinates according to the same set of duty ratio data, thereby causing a color inconsistency in each light source. This paper proposes an algorithm for personalizing the Red-Green-Blue (RGB) values by using the three primary-color coordinates obtained by feedbacks. Through extensive experiments, the algorithm can effectively reduce the color difference produced by different LED lamp beads. The algorithm has a small amount of calculation and can be easily implemented in practical devices.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124233487","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021378
Yanpu Hu, Shouyuan Wang, Shaogeng An
These days, several communication standardization committees are developing suitable and practical measurement methods for the Over the Air (OTA) testing of 5G non-connectorized base stations. Among the OTA testing methods, Compact Antenna Test Range (CATR) is very attractive for the direct testing of the far field Radio Frequency (RF) parameters and the wide frequency ranges, allowing the Active Antenna System (AAS) Base Station testing. The key OTA parameter of the AAS Base Station, such as Equivalent Isotropic Radiated Power (EIRP), Total Radiated Power (TRP), Equivalent Isotropic Sensitivity (EIS), has been studied in the introduced CATR system. Moreover, the measurement error assessment has been studied and analyzed with the CATR system. With the development of the 5G New Radio technology, the measurement technology and error analysis of the 5G AAS base stations are facing severe challenges. OTA testing will need to operate new requirements of the 5G AAS base stations.
最近，多个通信标准化委员会正在开发适用于5G非连接基站的Over the Air (OTA)测试的实用测量方法。在OTA测试方法中，紧凑天线测试范围(CATR)对于直接测试远场射频(RF)参数和宽频率范围非常有吸引力，允许有源天线系统(AAS)基站测试。在引入的CATR系统中，对AAS基站OTA关键参数等效各向同性辐射功率(EIRP)、总辐射功率(TRP)、等效各向同性灵敏度(EIS)进行了研究。此外，还对CATR系统的测量误差评估进行了研究和分析。随着5G新无线电技术的发展，5G AAS基站的测量技术和误差分析面临严峻挑战。OTA测试将需要满足5G AAS基站的新要求。
{"title":"Over the Air Testing and Error Analysis of 5G Active Antenna System Base Station in Compact Antenna Test Range","authors":"Yanpu Hu, Shouyuan Wang, Shaogeng An","doi":"10.1109/PIERS-Fall48861.2019.9021378","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021378","url":null,"abstract":"These days, several communication standardization committees are developing suitable and practical measurement methods for the Over the Air (OTA) testing of 5G non-connectorized base stations. Among the OTA testing methods, Compact Antenna Test Range (CATR) is very attractive for the direct testing of the far field Radio Frequency (RF) parameters and the wide frequency ranges, allowing the Active Antenna System (AAS) Base Station testing. The key OTA parameter of the AAS Base Station, such as Equivalent Isotropic Radiated Power (EIRP), Total Radiated Power (TRP), Equivalent Isotropic Sensitivity (EIS), has been studied in the introduced CATR system. Moreover, the measurement error assessment has been studied and analyzed with the CATR system. With the development of the 5G New Radio technology, the measurement technology and error analysis of the 5G AAS base stations are facing severe challenges. OTA testing will need to operate new requirements of the 5G AAS base stations.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124292859","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021893
Qi Wang, G. Xiao
A radiator consisting of half-wave dipoles that can characterize number 0 to 9 is simulated. The 10 numbers can be identified from their radiation fields without decoding. A deep neural network (DNN) model is trained on a large far-field dataset. This source model can still recognize well based on transfer learning methods even if the target data are obtained under other external conditions. The transfer learning methods of fine-tuning or freezing several layers of the source DNN model are verified, and the results are different on various target data. Some explanations are provided from the perspective of hierarchical structures of the source DNN model. Based on the method of feature matching, the features are extracted from the source model and the target model to verify the effects of transferring knowledge from source model to the target model.
{"title":"A Transfer Learning Approach for Recognizing the Digital Radiator","authors":"Qi Wang, G. Xiao","doi":"10.1109/PIERS-Fall48861.2019.9021893","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021893","url":null,"abstract":"A radiator consisting of half-wave dipoles that can characterize number 0 to 9 is simulated. The 10 numbers can be identified from their radiation fields without decoding. A deep neural network (DNN) model is trained on a large far-field dataset. This source model can still recognize well based on transfer learning methods even if the target data are obtained under other external conditions. The transfer learning methods of fine-tuning or freezing several layers of the source DNN model are verified, and the results are different on various target data. Some explanations are provided from the perspective of hierarchical structures of the source DNN model. Based on the method of feature matching, the features are extracted from the source model and the target model to verify the effects of transferring knowledge from source model to the target model.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114573931","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021730
K. Yoo, J. Chun, B. Choi
In randomized stepped frequency radar, two-dimensional matched filtering is performed to detect the target and estimate the range and radial velocity of target. However, if the region of target velocity to be considered is very wide, thus, target maneuvers very quickly, matched filtering should be performed to the corresponding wide velocity region. Then, grating lobe occurs periodically in the velocity axis, thereby causing a problem of finding a mainlobe in the grating lobe. In this study, we propose a two-stage low complexity detection algorithm for high-speed target. In the first stage, the coarse detection which determines the velocity region including mainlobe is performed. Then, fine detection is processed by performing 2D matched filtering in the reduced range-velocity region in the second stage. By dividing the target detection into two steps, computational complexity can be drastically reduced. The performance of the proposed technique is verified through simulation results.
{"title":"Low Complexity Detection Scheme for Fast Target in Randomized Stepped Frequency","authors":"K. Yoo, J. Chun, B. Choi","doi":"10.1109/PIERS-Fall48861.2019.9021730","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021730","url":null,"abstract":"In randomized stepped frequency radar, two-dimensional matched filtering is performed to detect the target and estimate the range and radial velocity of target. However, if the region of target velocity to be considered is very wide, thus, target maneuvers very quickly, matched filtering should be performed to the corresponding wide velocity region. Then, grating lobe occurs periodically in the velocity axis, thereby causing a problem of finding a mainlobe in the grating lobe. In this study, we propose a two-stage low complexity detection algorithm for high-speed target. In the first stage, the coarse detection which determines the velocity region including mainlobe is performed. Then, fine detection is processed by performing 2D matched filtering in the reduced range-velocity region in the second stage. By dividing the target detection into two steps, computational complexity can be drastically reduced. The performance of the proposed technique is verified through simulation results.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116321523","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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