Pub Date : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993604
Rio Yanagi, Keizo Cho, H. Nakabayashi, K. Suizu
This paper analyzes the results on the effectiveness of compressed sensing in terahertz wave imaging using a synthetic aperture array of point targets placed at equally spaced straight lines, with the aim of achieving faster measurements and higher image resolution.
{"title":"Reduction of synthetic aperture array element in THz imaging using compressed sensing","authors":"Rio Yanagi, Keizo Cho, H. Nakabayashi, K. Suizu","doi":"10.1109/iWEM52897.2022.9993604","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993604","url":null,"abstract":"This paper analyzes the results on the effectiveness of compressed sensing in terahertz wave imaging using a synthetic aperture array of point targets placed at equally spaced straight lines, with the aim of achieving faster measurements and higher image resolution.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132168074","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993584
Masafumi Suzuki, Kota Fukazawa, Akihoko Hirata, Hiroshi Murata, Masato Mizukami
We investigated MIMO communication using a PVC pipe wall as a communication path. We attached two antennas to both end faces of 1-m-long PVC pipe, and evaluated its transmission characteristics. When the antenna was installed on the cross section of the PVC pipe, S21 at 5 GHz was about −25 dB, which was more than 15 dB higher than that in case antennas are set inside the pipe and in free space. MIMO channel capacity becomes maximum (0.98 bit/s/Hz) when the antennas were placed at the same positions at both end faces on the diagonal line of the pipe.
{"title":"Study on MIMO Communication using Microwave Guided-Modes Propagating along PVC Pipe Wall","authors":"Masafumi Suzuki, Kota Fukazawa, Akihoko Hirata, Hiroshi Murata, Masato Mizukami","doi":"10.1109/iWEM52897.2022.9993584","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993584","url":null,"abstract":"We investigated MIMO communication using a PVC pipe wall as a communication path. We attached two antennas to both end faces of 1-m-long PVC pipe, and evaluated its transmission characteristics. When the antenna was installed on the cross section of the PVC pipe, S21 at 5 GHz was about −25 dB, which was more than 15 dB higher than that in case antennas are set inside the pipe and in free space. MIMO channel capacity becomes maximum (0.98 bit/s/Hz) when the antennas were placed at the same positions at both end faces on the diagonal line of the pipe.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"249 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121881100","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993546
Rio Kitamura, K. Honda
In this study, we present a method for over-the-air evaluation in which a full-rank channel matrix is created for a large-scale multiple-input multiple-output (MIMO) antenna in a cluster propagation environment with a Gaussian distributed incoming wave. In the proposed method, to mimic a fading emulator with a large number of scatterers, a limited number of scatterers are virtually arranged depending on the measured channel response. The analytical results show that even though the channel model comprised a limited number of scatterers, a full-rank channel matrix for a massive MIMO antenna system can be obtained by implementing the proposed method.
{"title":"Large-Scale MIMO OTA Method for Realizing the Full-Rank Channel Matrix in Cluster Environment","authors":"Rio Kitamura, K. Honda","doi":"10.1109/iWEM52897.2022.9993546","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993546","url":null,"abstract":"In this study, we present a method for over-the-air evaluation in which a full-rank channel matrix is created for a large-scale multiple-input multiple-output (MIMO) antenna in a cluster propagation environment with a Gaussian distributed incoming wave. In the proposed method, to mimic a fading emulator with a large number of scatterers, a limited number of scatterers are virtually arranged depending on the measured channel response. The analytical results show that even though the channel model comprised a limited number of scatterers, a full-rank channel matrix for a massive MIMO antenna system can be obtained by implementing the proposed method.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125000555","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993514
Tomonori Ikeda, M. Fujimoto, Kazuma Tomimoto, R. Yamaguchi
A coherent base station scanner has been developed to realize simple and small-scale measurement and evaluation of vehicular MIMO (Multiple-Input and Multiple-Output) under actual environments. In this paper, 2×2 MIMO antenna correlation mounted on vehicular is analyzed using measurement data acquired by the coherent base station scanner in actual LTE (Long Term Evolution) environments. As the results of analysis, the characteristics of antenna correlation for SINR, eigenvalues, and channel capacitance is clarified.
为实现车载多输入多输出(MIMO)在实际环境下的简单、小规模测量与评估，研制了相干基站扫描器。本文利用相干基站扫描器在实际LTE (Long Term Evolution)环境下采集的测量数据，对车载MIMO天线相关性2×2进行了分析。分析结果明确了天线相关特性对信噪比、特征值和信道电容的影响。
{"title":"Characteristic Analysis of Vehicular 2×2 MIMO Antenna correlation in Actual Environment","authors":"Tomonori Ikeda, M. Fujimoto, Kazuma Tomimoto, R. Yamaguchi","doi":"10.1109/iWEM52897.2022.9993514","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993514","url":null,"abstract":"A coherent base station scanner has been developed to realize simple and small-scale measurement and evaluation of vehicular MIMO (Multiple-Input and Multiple-Output) under actual environments. In this paper, 2×2 MIMO antenna correlation mounted on vehicular is analyzed using measurement data acquired by the coherent base station scanner in actual LTE (Long Term Evolution) environments. As the results of analysis, the characteristics of antenna correlation for SINR, eigenvalues, and channel capacitance is clarified.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125940048","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993519
Kota Hakamata, Keito Yokoe, S. Makino, K. Itoh
Metasurface-inspired antenna chip developed by KIT EOE Laboratory (MACKEY), operating in free space and on a metal plate, was investigated in this study. Metasurface means controlling the reflection phase. We proposed a method for reducing the size of MACKEY II in the 920 MHz band to less than the size of a credit card.
{"title":"MACKEY type H with One-Side Short-Circuit Structure for Further Miniaturization","authors":"Kota Hakamata, Keito Yokoe, S. Makino, K. Itoh","doi":"10.1109/iWEM52897.2022.9993519","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993519","url":null,"abstract":"Metasurface-inspired antenna chip developed by KIT EOE Laboratory (MACKEY), operating in free space and on a metal plate, was investigated in this study. Metasurface means controlling the reflection phase. We proposed a method for reducing the size of MACKEY II in the 920 MHz band to less than the size of a credit card.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124403229","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993549
Takafumi Morioka, Shumpei Kishi, K. Sakakibara, Yoshiki Sugimoto, N. Kikuma
Rotman-lens is widely used in multi-beam antenna as beamforming networks which give several beam directions. Rotman-lens provides discrete beam-scanning by switching input ports. In this paper, we designed a microstrip-line-fed Rotman-lens phase shifter at 274 GHz. The Rotman-lens in this paper is designed using single layer of the multi-layer substrate used in the terahertz frequency band. The results of the simulation confirmed that the output power distributes between −10 to −15 dB. Based on these transmission characteristics obtained from the analysis, it is confirmed that directional scanning in five directions is possible with a size of approximately 5 mm square.
{"title":"Design of Microstrip-Line-Fed Rotman-lens Beamforming Network at 274 GHz","authors":"Takafumi Morioka, Shumpei Kishi, K. Sakakibara, Yoshiki Sugimoto, N. Kikuma","doi":"10.1109/iWEM52897.2022.9993549","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993549","url":null,"abstract":"Rotman-lens is widely used in multi-beam antenna as beamforming networks which give several beam directions. Rotman-lens provides discrete beam-scanning by switching input ports. In this paper, we designed a microstrip-line-fed Rotman-lens phase shifter at 274 GHz. The Rotman-lens in this paper is designed using single layer of the multi-layer substrate used in the terahertz frequency band. The results of the simulation confirmed that the output power distributes between −10 to −15 dB. Based on these transmission characteristics obtained from the analysis, it is confirmed that directional scanning in five directions is possible with a size of approximately 5 mm square.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117135227","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993595
Jiale Lv, Xiaofei Xu, Bei Zhang
A new probe-fed wideband planar phased array antenna element (PAAE) is designed using stacked rectangular and U-slot patches. The bandwidth for the new PAAE is 3.14-5.44GHz (54%) for all beams radiating from broadside to ±45° on both of E- and H-planes, in which the voltage standing wave ratio is kept smaller than 3. The PAAE is in low vertical profile. The total thickness is only 10mm or normalized as 0.1λL, where λL is the wavelength at the low frequency 3.14GHz.
{"title":"Probe-fed Wideband Planar Phased Array Antenna Element Using Stacked Rectangular and U-slot Patches in Low Vertical Profile","authors":"Jiale Lv, Xiaofei Xu, Bei Zhang","doi":"10.1109/iWEM52897.2022.9993595","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993595","url":null,"abstract":"A new probe-fed wideband planar phased array antenna element (PAAE) is designed using stacked rectangular and U-slot patches. The bandwidth for the new PAAE is 3.14-5.44GHz (54%) for all beams radiating from broadside to ±45° on both of E- and H-planes, in which the voltage standing wave ratio is kept smaller than 3. The PAAE is in low vertical profile. The total thickness is only 10mm or normalized as 0.1λL, where λL is the wavelength at the low frequency 3.14GHz.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"332 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115846329","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993573
Y. Hokazono, H. Kohara, Y. Kishiyama, T. Asai
The high-altitude platform station (HAPS) is a promising solution for extreme coverage extension in the Fifth Generation (5G) Evolution and Sixth Generation (6G) eras. By providing radio waves from the stratosphere using HAPS, mobile communications can be made available in all locations that are not adequately covered by conventional mobile communications networks. It is desirable that the HAPS and terrestrial system share a frequency to actualize a direct access service in which terminals connected to the terrestrial International Mobile Telecommunications (IMT) network at 2.7 GHz or less can directly connect to the HAPS. In this paper, we propose a 3D-cell control technology as a load balancing and interference avoidance mechanism when HAPS and terrestrial network share a frequency. Evaluation results based on a 6G system-level simulator show that the load balance and interference-to-noise ratio characteristics are improved in the 2 GHz band.
{"title":"3D-Cell Control Technology for Frequency Sharing between HAPS and Terrestrial Systems","authors":"Y. Hokazono, H. Kohara, Y. Kishiyama, T. Asai","doi":"10.1109/iWEM52897.2022.9993573","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993573","url":null,"abstract":"The high-altitude platform station (HAPS) is a promising solution for extreme coverage extension in the Fifth Generation (5G) Evolution and Sixth Generation (6G) eras. By providing radio waves from the stratosphere using HAPS, mobile communications can be made available in all locations that are not adequately covered by conventional mobile communications networks. It is desirable that the HAPS and terrestrial system share a frequency to actualize a direct access service in which terminals connected to the terrestrial International Mobile Telecommunications (IMT) network at 2.7 GHz or less can directly connect to the HAPS. In this paper, we propose a 3D-cell control technology as a load balancing and interference avoidance mechanism when HAPS and terrestrial network share a frequency. Evaluation results based on a 6G system-level simulator show that the load balance and interference-to-noise ratio characteristics are improved in the 2 GHz band.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132658465","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993485
W. Yamada, M. Inomata, Nobuaki Kuno, M. Sasaki, Mitsuki Nakamura, K. Kitao, Takahiro Tomie, S. Suyama
Toward the development of the sub-terahertz band in 6G, propagation loss characteristics of 2.2, 26.4 and 158 GHz bands in the urban microcell environment, which is the main usage scenario of mobile communication systems, were measured. In this paper, the measurement results of propagation loss are reported.
{"title":"Pioneering New Frequency bands towards 6G Mobile Communication Systems","authors":"W. Yamada, M. Inomata, Nobuaki Kuno, M. Sasaki, Mitsuki Nakamura, K. Kitao, Takahiro Tomie, S. Suyama","doi":"10.1109/iWEM52897.2022.9993485","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993485","url":null,"abstract":"Toward the development of the sub-terahertz band in 6G, propagation loss characteristics of 2.2, 26.4 and 158 GHz bands in the urban microcell environment, which is the main usage scenario of mobile communication systems, were measured. In this paper, the measurement results of propagation loss are reported.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131537644","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993559
Yue Zhao, Lei Ge
In this paper, a dual-band antenna with large frequency ratio is proposed. By vertically combing a microwave patch antenna and a millimeter-wave (MMW) antenna array, an integrated design with high aperture reuse efficiency is obtained. In the design, the MMW antenna is placed above the microwave antenna and adopts the radiation patch of the microwave antenna as the MMW antenna ground. Through a shorting post of the microwave patch antenna, the microwave and MMW antenna share the common ground. To demonstrate the idea, a design at 3.5 GHz and 26 GHz which are two key bands for 5G communications is presented as an example. 14% bandwidth with 7.4 dBi gain and 8% bandwidth with 16 dBi gain are achieved at 3.5 GHz and 26 GHz band respectively.
{"title":"A Dual-band Shared-Aperture Antenna With Large Frequency Ratio for 5G Applications","authors":"Yue Zhao, Lei Ge","doi":"10.1109/iWEM52897.2022.9993559","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993559","url":null,"abstract":"In this paper, a dual-band antenna with large frequency ratio is proposed. By vertically combing a microwave patch antenna and a millimeter-wave (MMW) antenna array, an integrated design with high aperture reuse efficiency is obtained. In the design, the MMW antenna is placed above the microwave antenna and adopts the radiation patch of the microwave antenna as the MMW antenna ground. Through a shorting post of the microwave patch antenna, the microwave and MMW antenna share the common ground. To demonstrate the idea, a design at 3.5 GHz and 26 GHz which are two key bands for 5G communications is presented as an example. 14% bandwidth with 7.4 dBi gain and 8% bandwidth with 16 dBi gain are achieved at 3.5 GHz and 26 GHz band respectively.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131004109","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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