Pub Date : 2024-11-25DOI: 10.1109/LAWP.2024.3505894
Ning Leng;Liao Ma;Zhanjian Liang;Shiyuan Zhang;Sai Chen;Ming Bai
Near-field measurements of active phased array antennas are typically carried out in the radiation region several wavelengths away from the antennas. The reactive near field distributed on the antenna surface carries high-resolution information, which is suitable for the array element measurement. However, limited by the aperture size of the conventional near-field probe (such as the open-ended waveguide), it is unable to obtain the high-resolution reactive near-field distribution of the active phased antennas. In this letter, we propose an efficient reactive near-field measurement method utilizing scanning optic-induced plasma scattering technology. A Ka-band active transmitting phased array antenna was measured. This method enables the direct observation of reactive near-field distributions with high resolution, allowing for high-efficiency measurement of the antenna operational states in tens of seconds. It is demonstrated that the proposed method can achieve the reactive near-field measurement efficiently and has significant potential for applications in antenna array diagnosis.
{"title":"An Efficient Reactive Near-Field Measurement Method for Active Phased Array Antennas","authors":"Ning Leng;Liao Ma;Zhanjian Liang;Shiyuan Zhang;Sai Chen;Ming Bai","doi":"10.1109/LAWP.2024.3505894","DOIUrl":"https://doi.org/10.1109/LAWP.2024.3505894","url":null,"abstract":"Near-field measurements of active phased array antennas are typically carried out in the radiation region several wavelengths away from the antennas. The reactive near field distributed on the antenna surface carries high-resolution information, which is suitable for the array element measurement. However, limited by the aperture size of the conventional near-field probe (such as the open-ended waveguide), it is unable to obtain the high-resolution reactive near-field distribution of the active phased antennas. In this letter, we propose an efficient reactive near-field measurement method utilizing scanning optic-induced plasma scattering technology. A Ka-band active transmitting phased array antenna was measured. This method enables the direct observation of reactive near-field distributions with high resolution, allowing for high-efficiency measurement of the antenna operational states in tens of seconds. It is demonstrated that the proposed method can achieve the reactive near-field measurement efficiently and has significant potential for applications in antenna array diagnosis.","PeriodicalId":51059,"journal":{"name":"IEEE Antennas and Wireless Propagation Letters","volume":"24 2","pages":"474-478"},"PeriodicalIF":3.7,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10766931","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143360866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-25DOI: 10.1109/LAWP.2024.3505270
Jun-Feng Wang;Hao Huang;Zhizhang Chen
In this letter, a 2-D parameter-optimized spatial finite-difference temporal differential (SFDTD) method is presented, referred to as the PO-SFDTD method. First, the dispersion characteristic of the conventional SFDTD method is demonstrated. To improve dispersion performance, we incorporate a weight parameter and utilize the central-difference approximation with four stencils for spatial discretization. Then, we develop a dispersion-controllable 2-D PO-SFDTD method. Numerical experiments validate that the proposed method can significantly reduce dispersion errors and optimize numerical dispersion according to specific requirements.
{"title":"A 2-D Parameter-Optimized Spatial Finite-Difference Temporal Differential Method With Dispersion-Controllable Properties","authors":"Jun-Feng Wang;Hao Huang;Zhizhang Chen","doi":"10.1109/LAWP.2024.3505270","DOIUrl":"https://doi.org/10.1109/LAWP.2024.3505270","url":null,"abstract":"In this letter, a 2-D parameter-optimized spatial finite-difference temporal differential (SFDTD) method is presented, referred to as the PO-SFDTD method. First, the dispersion characteristic of the conventional SFDTD method is demonstrated. To improve dispersion performance, we incorporate a weight parameter and utilize the central-difference approximation with four stencils for spatial discretization. Then, we develop a dispersion-controllable 2-D PO-SFDTD method. Numerical experiments validate that the proposed method can significantly reduce dispersion errors and optimize numerical dispersion according to specific requirements.","PeriodicalId":51059,"journal":{"name":"IEEE Antennas and Wireless Propagation Letters","volume":"24 2","pages":"464-468"},"PeriodicalIF":3.7,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-25DOI: 10.1109/LAWP.2024.3506452
Raha Roosefid;Sadegh Mansouri Moghaddam;Lukas Nyström;Jian Yang;Ashraf Uz Zaman
This letter presents a low-profile, high-gain cavity-backed slot array antenna, based on ridge gap waveguide (RGW) technology, to operate within the Ka frequency band. The antenna array consists of two layers. The upper layer incorporates an array of U-shaped slots, positioned over a cavity loaded with a metal ridge section, while the lower layer is a RGW corporate distribution network, feeding each of the cavity-backed slots separately with equal phase and amplitude. The proposed array antenna radiates circularly polarized waves (axial ratio below 3$ text{ dB}$) over a bandwidth of 8.6$ %$ ranging from 27.5$ $ GHz to 30$ , text{ GHz}$. At the centre frequency of 28.75 GHz, the peak gain at the broadside direction is 27$ text{ dBi}$ and the first relative sidelobe level is below −13$ text{ dB}$. The total size of the proposed 8 × 8$ $-element array antenna is 6.7$ lambda _{0} times $ 6.5$ lambda _{0} times $ 1.4$ lambda _{0} $.
{"title":"Development of a High-Efficiency Circularly Polarized Ka-Band Satcom Antenna Utilizing Ridge-Loaded U-Shaped Radiator","authors":"Raha Roosefid;Sadegh Mansouri Moghaddam;Lukas Nyström;Jian Yang;Ashraf Uz Zaman","doi":"10.1109/LAWP.2024.3506452","DOIUrl":"https://doi.org/10.1109/LAWP.2024.3506452","url":null,"abstract":"This letter presents a low-profile, high-gain cavity-backed slot array antenna, based on ridge gap waveguide (RGW) technology, to operate within the Ka frequency band. The antenna array consists of two layers. The upper layer incorporates an array of U-shaped slots, positioned over a cavity loaded with a metal ridge section, while the lower layer is a RGW corporate distribution network, feeding each of the cavity-backed slots separately with equal phase and amplitude. The proposed array antenna radiates circularly polarized waves (axial ratio below 3<inline-formula><tex-math>$ text{ dB}$</tex-math></inline-formula>) over a bandwidth of 8.6<inline-formula><tex-math>$ %$</tex-math></inline-formula> ranging from 27.5<inline-formula><tex-math>$ $</tex-math></inline-formula> GHz to 30<inline-formula><tex-math>$ , text{ GHz}$</tex-math></inline-formula>. At the centre frequency of 28.75 GHz, the peak gain at the broadside direction is 27<inline-formula><tex-math>$ text{ dBi}$</tex-math></inline-formula> and the first relative sidelobe level is below −13<inline-formula><tex-math>$ text{ dB}$</tex-math></inline-formula>. The total size of the proposed 8 × 8<inline-formula><tex-math>$ $</tex-math></inline-formula>-element array antenna is 6.7<inline-formula><tex-math>$ lambda _{0} times $</tex-math></inline-formula> 6.5<inline-formula><tex-math>$ lambda _{0} times $</tex-math></inline-formula> 1.4<inline-formula><tex-math>$ lambda _{0} $</tex-math></inline-formula>.","PeriodicalId":51059,"journal":{"name":"IEEE Antennas and Wireless Propagation Letters","volume":"24 2","pages":"484-488"},"PeriodicalIF":3.7,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-25DOI: 10.1109/LAWP.2024.3505937
Liangliang Zhao;Hailiang Zhu;Yujie Di;Huiling Zhao;Jinchao Mou;Chufeng Hu
Generally, thedimension of the antenna arrays is fixed after manufacturing, limiting their radiation characteristics. Due to the existence of interconnected characteristics between elements in a tightly coupled dipole array (TCDA), this letter proposes a novel modular TCDA design with joinable components. The parasitic metal strip in the H-plane facilitates the deigned planar dual-polarized TCDA, which employs the joinable design to achieve an impedance bandwidth of 9.4:1 [(1 to 9.4) GHz], with an active voltage standing wave ratio (VSWR) of less than 3. Additionally, it enables beam scanning up to 80° in E/H-plane. Specifically, an arbitrary dimension of TCDA can be assembled in a short time and all units can be reused. To the best of the authors’ knowledge, the concept of joinable design introduced in ultrawide and wide-angle scanning TCDAs is presented for the first time.
{"title":"Design of Joinable Antenna Array With Wide-Angle Scanning","authors":"Liangliang Zhao;Hailiang Zhu;Yujie Di;Huiling Zhao;Jinchao Mou;Chufeng Hu","doi":"10.1109/LAWP.2024.3505937","DOIUrl":"https://doi.org/10.1109/LAWP.2024.3505937","url":null,"abstract":"Generally, thedimension of the antenna arrays is fixed after manufacturing, limiting their radiation characteristics. Due to the existence of interconnected characteristics between elements in a tightly coupled dipole array (TCDA), this letter proposes a novel modular TCDA design with joinable components. The parasitic metal strip in the H-plane facilitates the deigned planar dual-polarized TCDA, which employs the joinable design to achieve an impedance bandwidth of 9.4:1 [(1 to 9.4) GHz], with an active voltage standing wave ratio (VSWR) of less than 3. Additionally, it enables beam scanning up to 80° in E/H-plane. Specifically, an arbitrary dimension of TCDA can be assembled in a short time and all units can be reused. To the best of the authors’ knowledge, the concept of joinable design introduced in ultrawide and wide-angle scanning TCDAs is presented for the first time.","PeriodicalId":51059,"journal":{"name":"IEEE Antennas and Wireless Propagation Letters","volume":"24 2","pages":"479-483"},"PeriodicalIF":3.7,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143360867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-22DOI: 10.1109/LAWP.2024.3505420
Xi Wang Dai;Yang Hui Fu;Ze Li;Jianzhong Chen;Yuan Wei;Wei Jun Wu;Hui Hong
In a communication system, orbital angular momentum (OAM) serves as a means for multichannel transmission, enhancing both transmission capacity and communication speed. A novel approach by integrating eight “L”-shaped slots as disturbance elements is proposed in this paper. The circular arrangement induces a phase difference across the antenna's surface, effectively replacing the need for a phase-controlled array. Each disturbance element functions akin to an array element, generating continuous phase-differing electromagnetic waves at an azimuthal angle. The antenna is designed with a single port, enabling the formation of the l = −1 mode, thereby significantly simplifying the OAM generation device. By leveraging a substrate integrated waveguide (SIW) the antenna's footprint and cost are substantially reduced. Within the 22.7 GHz to 25.5 GHz frequency band, the antenna exhibits remarkable performance metrics: the modal purity of the l = −1 mode can reach over 95%, with a gain of over 8.2 dBi and a null depth of less than 40 dB. Additionally, it features a low profile, low cost, and high purity across a wide bandwidth, providing an ideal choice for wireless communication and radar technology.
{"title":"Novel OAM Antenna Based on Circular SIW Resonant Cavity","authors":"Xi Wang Dai;Yang Hui Fu;Ze Li;Jianzhong Chen;Yuan Wei;Wei Jun Wu;Hui Hong","doi":"10.1109/LAWP.2024.3505420","DOIUrl":"https://doi.org/10.1109/LAWP.2024.3505420","url":null,"abstract":"In a communication system, orbital angular momentum (OAM) serves as a means for multichannel transmission, enhancing both transmission capacity and communication speed. A novel approach by integrating eight “L”-shaped slots as disturbance elements is proposed in this paper. The circular arrangement induces a phase difference across the antenna's surface, effectively replacing the need for a phase-controlled array. Each disturbance element functions akin to an array element, generating continuous phase-differing electromagnetic waves at an azimuthal angle. The antenna is designed with a single port, enabling the formation of the <italic>l</i> = −1 mode, thereby significantly simplifying the OAM generation device. By leveraging a substrate integrated waveguide (SIW) the antenna's footprint and cost are substantially reduced. Within the 22.7 GHz to 25.5 GHz frequency band, the antenna exhibits remarkable performance metrics: the modal purity of the <italic>l</i> = −1 mode can reach over 95%, with a gain of over 8.2 dBi and a null depth of less than 40 dB. Additionally, it features a low profile, low cost, and high purity across a wide bandwidth, providing an ideal choice for wireless communication and radar technology.","PeriodicalId":51059,"journal":{"name":"IEEE Antennas and Wireless Propagation Letters","volume":"24 2","pages":"469-473"},"PeriodicalIF":3.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-21DOI: 10.1109/LAWP.2024.3504373
S. H. Ramazannia Tuloti;Adam Lamecki;Michal Mrozowski
This leter presents a novel, very low-profile transmitarray antenna (TA) designed specifically for applications in the 24 GHz Industrial, Scientific, and Medical (ISM) band. The design innovation lies in embedding the switchable feed antenna into the beam-focusing surface and adding a reflector, which effectively halves the antenna's size in the boresight direction. This compact antenna allows for easy beam switching through the use of microswitches, making it well suited for vehicular radar applications. A TA consisting of 829 units with an F/D ratio of 0.5 has been successfully engineered and fabricated for operation at 24.125 GHz. Notably, the antenna exhibits beam-switching capabilities at various angles, including 8°, 16°, and 24° in the negative X-axis direction and 8°, 16°, 24°, and 32° in the positive X-axis direction, in addition to the boresight direction. The maximum measured gain of the antenna is 19.85 dBi, and it can achieve a tilt of 32° with a gain reduction of approximately 3.52 dB compared to the boresight direction.
{"title":"A Highly Compact Low-Profile Beam-Switching Transmitarray Antenna for ISM-Band Applications","authors":"S. H. Ramazannia Tuloti;Adam Lamecki;Michal Mrozowski","doi":"10.1109/LAWP.2024.3504373","DOIUrl":"https://doi.org/10.1109/LAWP.2024.3504373","url":null,"abstract":"This leter presents a novel, very low-profile transmitarray antenna (TA) designed specifically for applications in the 24 GHz Industrial, Scientific, and Medical (ISM) band. The design innovation lies in embedding the switchable feed antenna into the beam-focusing surface and adding a reflector, which effectively halves the antenna's size in the boresight direction. This compact antenna allows for easy beam switching through the use of microswitches, making it well suited for vehicular radar applications. A TA consisting of 829 units with an <italic>F/D</i> ratio of 0.5 has been successfully engineered and fabricated for operation at 24.125 GHz. Notably, the antenna exhibits beam-switching capabilities at various angles, including 8°, 16°, and 24° in the negative <italic>X</i>-axis direction and 8°, 16°, 24°, and 32° in the positive <italic>X</i>-axis direction, in addition to the boresight direction. The maximum measured gain of the antenna is 19.85 dBi, and it can achieve a tilt of 32° with a gain reduction of approximately 3.52 dB compared to the boresight direction.","PeriodicalId":51059,"journal":{"name":"IEEE Antennas and Wireless Propagation Letters","volume":"24 2","pages":"459-463"},"PeriodicalIF":3.7,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this letter, a multifunctional reconfigurable metamaterial (MRMM), featuring three operating states is introduced based on the multi-scale integration of hierarchical microchannel configuration and liquid metal (LM) regulation strategy. The MRMM can flexibly switch among full-band transmission from 8 GHz to 15 GHz with an insertion loss (IL) of 1 dB, second-order bandpass from 11.64 GHz to 13.72 GHz (also featuring an IL of 1 dB), and full-band shielding from 8 GHz to 15 GHz with a reflection loss (RL) of −15 dB, while exhibiting reliable polarization and angular stability. Subsequently, the physical mechanisms of the MRMM at different states are analyzed using the equivalent circuit method (ECM). Finally, a physical sample of the proposed design is manufactured and tested to validate the effectiveness of simulation results. Both numerical simulations and experimental verifications confirm the wide switchable bandwidth and multistate characteristics of the MRMM.
{"title":"Multifunctional Metamaterials Through Liquid Metal-Controlled Hierarchical Microchannel Structures","authors":"Huangyan Li;Shuosheng Liu;Yichun Cui;Filippo Costa;Xiaoxing Fang;Xiang Wang;Boyu Sima;Jun Hu;Wen Wu","doi":"10.1109/LAWP.2024.3503581","DOIUrl":"https://doi.org/10.1109/LAWP.2024.3503581","url":null,"abstract":"In this letter, a multifunctional reconfigurable metamaterial (MRMM), featuring three operating states is introduced based on the multi-scale integration of hierarchical microchannel configuration and liquid metal (LM) regulation strategy. The MRMM can flexibly switch among full-band transmission from 8 GHz to 15 GHz with an insertion loss (IL) of 1 dB, second-order bandpass from 11.64 GHz to 13.72 GHz (also featuring an IL of 1 dB), and full-band shielding from 8 GHz to 15 GHz with a reflection loss (RL) of −15 dB, while exhibiting reliable polarization and angular stability. Subsequently, the physical mechanisms of the MRMM at different states are analyzed using the equivalent circuit method (ECM). Finally, a physical sample of the proposed design is manufactured and tested to validate the effectiveness of simulation results. Both numerical simulations and experimental verifications confirm the wide switchable bandwidth and multistate characteristics of the MRMM.","PeriodicalId":51059,"journal":{"name":"IEEE Antennas and Wireless Propagation Letters","volume":"24 2","pages":"449-453"},"PeriodicalIF":3.7,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-21DOI: 10.1109/LAWP.2024.3503597
Weihong Zhang;Ke Han;Zhuoxi Jiang;Ze Yan
In this letter, an enhanced-bandwidth multibeam antenna based on center-fed linear slot array is proposed. First, by placing the coupling slot in the center and inserting matching vias, the proposed center-fed method can enhance the bandwidth by exciting slots of linear slot array in phase in an enhanced bandwidth. To illustrate the operation principle, the electric fields of center-fed structure and the function equations among the phase, distance, and frequency are analyzed and presented. Then, the multibeam application of the center-fed linear slot array with 4 × 4 Butler matrix beamforming network is fabricated and measured. The measured impedance and 3 dB gain bandwidths are 13.69% and 14.09%. When exciting different ports, the beam angles fluctuate around −38°, −20°, 20°, and 40°, with peak gains of 16.66 dBi, 17.6 dBi 5, 17.74 dBi, and 16.88 dBi.
{"title":"Enhanced-Bandwidth Center-Fed Linear Slot Array and Its Multibeam Application","authors":"Weihong Zhang;Ke Han;Zhuoxi Jiang;Ze Yan","doi":"10.1109/LAWP.2024.3503597","DOIUrl":"https://doi.org/10.1109/LAWP.2024.3503597","url":null,"abstract":"In this letter, an enhanced-bandwidth multibeam antenna based on center-fed linear slot array is proposed. First, by placing the coupling slot in the center and inserting matching vias, the proposed center-fed method can enhance the bandwidth by exciting slots of linear slot array in phase in an enhanced bandwidth. To illustrate the operation principle, the electric fields of center-fed structure and the function equations among the phase, distance, and frequency are analyzed and presented. Then, the multibeam application of the center-fed linear slot array with 4 × 4 Butler matrix beamforming network is fabricated and measured. The measured impedance and 3 dB gain bandwidths are 13.69% and 14.09%. When exciting different ports, the beam angles fluctuate around −38°, −20°, 20°, and 40°, with peak gains of 16.66 dBi, 17.6 dBi 5, 17.74 dBi, and 16.88 dBi.","PeriodicalId":51059,"journal":{"name":"IEEE Antennas and Wireless Propagation Letters","volume":"24 2","pages":"454-458"},"PeriodicalIF":3.7,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-20DOI: 10.1109/LAWP.2024.3500355
Jiaojiao Li;Hanhong Liu;Yuhui Wang;Yanlin Wang;Zekun Zhu;Langran Deng;Shunchuan Yang
An accuracy-enhanced vector fitting (VF) technique is proposed in this letter to fit electromagnetic parameters, which do not require conjugate symmetric complex terms. Based on the original VF technique, a gain coefficient is introduced by each term in the pole-residue model and solved using the system equation constructed from measured data. Then, these coefficients are incorporated into the residual and constant of the corresponding term in the existing pole-residue model. In addition, four adaptive order selection schemes for engineering applications are discussed and given. Two numerical examples, including complex refractive index and relative permittivity of metals, and the surface conductivity of mulilayer graphene, demonstrate the improvement on the fitting accuracy of the proposed technique.
{"title":"An Accuracy-Enhanced Vector Fitting Technique and Its Applications to Model Electromagnetic Parameters","authors":"Jiaojiao Li;Hanhong Liu;Yuhui Wang;Yanlin Wang;Zekun Zhu;Langran Deng;Shunchuan Yang","doi":"10.1109/LAWP.2024.3500355","DOIUrl":"https://doi.org/10.1109/LAWP.2024.3500355","url":null,"abstract":"An accuracy-enhanced vector fitting (VF) technique is proposed in this letter to fit electromagnetic parameters, which do not require conjugate symmetric complex terms. Based on the original VF technique, a gain coefficient is introduced by each term in the pole-residue model and solved using the system equation constructed from measured data. Then, these coefficients are incorporated into the residual and constant of the corresponding term in the existing pole-residue model. In addition, four adaptive order selection schemes for engineering applications are discussed and given. Two numerical examples, including complex refractive index and relative permittivity of metals, and the surface conductivity of mulilayer graphene, demonstrate the improvement on the fitting accuracy of the proposed technique.","PeriodicalId":51059,"journal":{"name":"IEEE Antennas and Wireless Propagation Letters","volume":"24 2","pages":"404-408"},"PeriodicalIF":3.7,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1109/LAWP.2024.3502448
Shuchen Wang;Zeyang Zhang;Tian Hong Loh;Yang Yang;Fei Qin
Wireless communication technology is evolving rapidly, where multiple-input–multiple-output (MIMO) technology plays a crucial role by effectively leveraging the diversity of spatial multipath channels. Most MIMO algorithms are designed with the simple but effective spatial correlation assumption, which assumes homological multipath characteristics for all elements of the antenna array. However, this ideal assumption may not always hold, which can be broken by the heterogeneity in multipath effects across regions. Thus, identifying and categorizing these heterogeneous regions is essential for both optimization and deployment in next-generation wireless communication systems. In this letter, we treat the heterogeneous as semantic in multipath fading domain, and propose to segment the regional map into different partitions. In detail, this letter introduces a multistacked U-shaped network (U-net) model, designed for effective channel segmentation. The model is trained on datasets generated through ray tracing (RT) methods across diverse scenarios. Extensive experiments demonstrate that the proposed data-driven model achieves a segmentation accuracy of 78.931%, effectively identifying complex multipath regions, while operating several thousand times faster than RT methods.
{"title":"Semantic Segmentation of Multipath Fading Channel-Based Regional Map","authors":"Shuchen Wang;Zeyang Zhang;Tian Hong Loh;Yang Yang;Fei Qin","doi":"10.1109/LAWP.2024.3502448","DOIUrl":"https://doi.org/10.1109/LAWP.2024.3502448","url":null,"abstract":"Wireless communication technology is evolving rapidly, where multiple-input–multiple-output (MIMO) technology plays a crucial role by effectively leveraging the diversity of spatial multipath channels. Most MIMO algorithms are designed with the simple but effective spatial correlation assumption, which assumes homological multipath characteristics for all elements of the antenna array. However, this ideal assumption may not always hold, which can be broken by the heterogeneity in multipath effects across regions. Thus, identifying and categorizing these heterogeneous regions is essential for both optimization and deployment in next-generation wireless communication systems. In this letter, we treat the heterogeneous as semantic in multipath fading domain, and propose to segment the regional map into different partitions. In detail, this letter introduces a multistacked U-shaped network (U-net) model, designed for effective channel segmentation. The model is trained on datasets generated through ray tracing (RT) methods across diverse scenarios. Extensive experiments demonstrate that the proposed data-driven model achieves a segmentation accuracy of 78.931%, effectively identifying complex multipath regions, while operating several thousand times faster than RT methods.","PeriodicalId":51059,"journal":{"name":"IEEE Antennas and Wireless Propagation Letters","volume":"24 2","pages":"439-443"},"PeriodicalIF":3.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","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：