To quantify the effect of air gap on the dielectric constant measurement of low-loss materials, this letter presents the first quantitative study of the effect of five different shapes on the dielectric constant measurement using three low-loss materials as examples. The experimental results show that if low-loss materials’ dielectric constant measurement error is controlled within 5%, the air gap cannot exceed 4%. The results of this letter can provide effective guidance and reference for improving the measurement accuracy of electromagnetic parameters of low-loss materials.
{"title":"Effect of Different Shapes on the Measurement of Dielectric Constants of Low-Loss Materials With Rectangular Waveguides at X-Band","authors":"Guifeng Yang, Shaohua Zhou, Weijun Liang, Xin Li, Hui Huang, Jianhua Yang","doi":"10.1109/LMWC.2022.3177400","DOIUrl":"https://doi.org/10.1109/LMWC.2022.3177400","url":null,"abstract":"To quantify the effect of air gap on the dielectric constant measurement of low-loss materials, this letter presents the first quantitative study of the effect of five different shapes on the dielectric constant measurement using three low-loss materials as examples. The experimental results show that if low-loss materials’ dielectric constant measurement error is controlled within 5%, the air gap cannot exceed 4%. The results of this letter can provide effective guidance and reference for improving the measurement accuracy of electromagnetic parameters of low-loss materials.","PeriodicalId":13130,"journal":{"name":"IEEE Microwave and Wireless Components Letters","volume":"32 1","pages":"1471-1474"},"PeriodicalIF":3.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42429450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/LMWC.2022.3192891
Song Guo, K. Song, Li Qian, Xinjun Zou
In this letter, a broadband waveguide magic-T with compact size is presented. A grounded suspended stripline has been used to obtain broadband isolation characteristics and increase power capacity. The inner ridge-matching structure is used to achieve broadband matching. The method and design process of the demonstrated magic-T are described in detail. The measured 15-dB bandwidth is about 30.3%, almost for waveguide BJ-320 waveguide operating bandwidth. The measured isolation between sum and deference ports is above 37.5 dB; 20-dB measured isolation is achieved between collinear ports. The measured and simulated results are in good agreement. It has advantages in high-power applications.
{"title":"A Broadband Ka-Band Waveguide Magic-T With Compact Inner Ridge Matching","authors":"Song Guo, K. Song, Li Qian, Xinjun Zou","doi":"10.1109/LMWC.2022.3192891","DOIUrl":"https://doi.org/10.1109/LMWC.2022.3192891","url":null,"abstract":"In this letter, a broadband waveguide magic-T with compact size is presented. A grounded suspended stripline has been used to obtain broadband isolation characteristics and increase power capacity. The inner ridge-matching structure is used to achieve broadband matching. The method and design process of the demonstrated magic-T are described in detail. The measured 15-dB bandwidth is about 30.3%, almost for waveguide BJ-320 waveguide operating bandwidth. The measured isolation between sum and deference ports is above 37.5 dB; 20-dB measured isolation is achieved between collinear ports. The measured and simulated results are in good agreement. It has advantages in high-power applications.","PeriodicalId":13130,"journal":{"name":"IEEE Microwave and Wireless Components Letters","volume":"41 1","pages":"1395-1398"},"PeriodicalIF":3.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41278342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/LMWC.2022.3180677
R. A. Mellita, S. S. Karthikeyan, P. Damodharan
In this letter, a low-profile dual-band frequency selective surface (FSS) is designed as a polarizer for satellite communication. This single-layered FSS with a meandered open loop intersected by a metallic strip behaves as a dual sense polarizer. It converts linearly polarized (LP) EM waves of frequency range 2.01–2.64 GHz into left-hand circularly polarized (LHCP) EM waves. Similarly, the LP waves in the frequency range of 3.26–3.68 GHz are converted into right-hand circularly polarized (RHCP) EM waves. The unit cell dimension of the compact polarizer is $0.075lambda _{0} times 0.075lambda _{0} times 0.005lambda _{0}$ , where $lambda _{0}$ stands for free space wavelength at the lowest cut-off frequency. This study explores the structural design evolution of the proposed polarizer and verifies the frequency behavior of the structure using a circuit model. The simulated performance of the dual-band polarizer is experimentally tested. Good concordance is observed between the simulated and measured results.
在这封信中，设计了一种低剖面双频带频率选择表面（FSS）作为卫星通信的偏振器。这种单层FSS具有与金属带相交的曲折开环，表现为双感偏振器。它将频率范围为2.01–2.64 GHz的线性极化（LP）电磁波转换为左旋圆极化（LHCP）电磁波。类似地，3.26–3.68 GHz频率范围内的LP波被转换为右旋圆极化（RHCP）EM波。紧凑型偏振器的晶胞尺寸为$0.75lambda _｛0｝times 0.075lambda _{0｝ times 0.005lambda_｛0}$，其中$lambda-{0}$代表最低截止频率下的自由空间波长。本研究探索了所提出的偏振器的结构设计演变，并使用电路模型验证了该结构的频率特性。实验测试了双频带偏振器的模拟性能。在模拟结果和测量结果之间观察到良好的一致性。
{"title":"Dual-Band Ultrathin Polarization Converter for S-Band Microwave Transmission","authors":"R. A. Mellita, S. S. Karthikeyan, P. Damodharan","doi":"10.1109/LMWC.2022.3180677","DOIUrl":"https://doi.org/10.1109/LMWC.2022.3180677","url":null,"abstract":"In this letter, a low-profile dual-band frequency selective surface (FSS) is designed as a polarizer for satellite communication. This single-layered FSS with a meandered open loop intersected by a metallic strip behaves as a dual sense polarizer. It converts linearly polarized (LP) EM waves of frequency range 2.01–2.64 GHz into left-hand circularly polarized (LHCP) EM waves. Similarly, the LP waves in the frequency range of 3.26–3.68 GHz are converted into right-hand circularly polarized (RHCP) EM waves. The unit cell dimension of the compact polarizer is <inline-formula> <tex-math notation=\"LaTeX\">$0.075lambda _{0} times 0.075lambda _{0} times 0.005lambda _{0}$ </tex-math></inline-formula>, where <inline-formula> <tex-math notation=\"LaTeX\">$lambda _{0}$ </tex-math></inline-formula> stands for free space wavelength at the lowest cut-off frequency. This study explores the structural design evolution of the proposed polarizer and verifies the frequency behavior of the structure using a circuit model. The simulated performance of the dual-band polarizer is experimentally tested. Good concordance is observed between the simulated and measured results.","PeriodicalId":13130,"journal":{"name":"IEEE Microwave and Wireless Components Letters","volume":"32 1","pages":"1467-1470"},"PeriodicalIF":3.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43960659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/LMWC.2022.3192835
Jian Liu, M. Zhang, Shuangqi Cai, Jia Chen
In this letter, a broadband rectifier with a wide-incident-angle (WIA) property is proposed. The circuit is composed of a broadband quadrature coupler (BQC) and two broadband subrectifiers (RectA and RectB). Here, RectA and RectB are connected to the two output ports of the BQC and combined by a direct current (dc) power combiner. Then, the obtained dc power is transmitted to the load resistor. Besides, two RF sources (RF1 and RF2) with identical input power and a phase difference ($Delta varphi$ ) are connected to the input and isolated ports of the BQC. A detailed theoretical analysis is carried out. To validate the proposed scheme, we design a broadband (1.6–2.8 GHz) WIA rectifier. Measurement results show that the power conversion efficiency (PCE) exceeded 60% in the frequency range from 1.6 to 2.8 GHz at 13.1 dBm of the input power. Additionally, at 2.45 GHz, the PCE varies in the range of 60.8% and 72.6% within the entire $Delta varphi $ range (0°–360°). Thus, the obtained PCE variation ($Delta eta$ ) is 11.8%. Considering its excellent broadband and WIA features, it is very suitable for high-efficiency radio-frequency (RF) energy harvesting (RFEH) systems.
本文提出了一种具有宽入射角特性的宽带整流器。该电路由一个宽带正交耦合器(BQC)和两个宽带减整流器(RectA和RectB)组成。在这里，RectA和RectB连接到BQC的两个输出端口，并通过直流(dc)电源组合器组合。然后，得到的直流功率被传输到负载电阻。另外，两个输入功率相同、相位差($Delta varphi$)的射频源(RF1和RF2)分别连接在BQC的输入和隔离端口上。并进行了详细的理论分析。为了验证所提出的方案，我们设计了一个宽带(1.6-2.8 GHz) WIA整流器。测量结果表明，功率转换效率(PCE)超过60% in the frequency range from 1.6 to 2.8 GHz at 13.1 dBm of the input power. Additionally, at 2.45 GHz, the PCE varies in the range of 60.8% and 72.6% within the entire $Delta varphi $ range (0°–360°). Thus, the obtained PCE variation ( $Delta eta$ ) is 11.8%. Considering its excellent broadband and WIA features, it is very suitable for high-efficiency radio-frequency (RF) energy harvesting (RFEH) systems.
{"title":"A Broadband Rectifier With Wide Incident Angle of Incoming Waves Based on Quadrature Coupler for RF Energy Harvesting","authors":"Jian Liu, M. Zhang, Shuangqi Cai, Jia Chen","doi":"10.1109/LMWC.2022.3192835","DOIUrl":"https://doi.org/10.1109/LMWC.2022.3192835","url":null,"abstract":"In this letter, a broadband rectifier with a wide-incident-angle (WIA) property is proposed. The circuit is composed of a broadband quadrature coupler (BQC) and two broadband subrectifiers (RectA and RectB). Here, RectA and RectB are connected to the two output ports of the BQC and combined by a direct current (dc) power combiner. Then, the obtained dc power is transmitted to the load resistor. Besides, two RF sources (RF1 and RF2) with identical input power and a phase difference (<inline-formula> <tex-math notation=\"LaTeX\">$Delta varphi$ </tex-math></inline-formula>) are connected to the input and isolated ports of the BQC. A detailed theoretical analysis is carried out. To validate the proposed scheme, we design a broadband (1.6–2.8 GHz) WIA rectifier. Measurement results show that the power conversion efficiency (PCE) exceeded 60% in the frequency range from 1.6 to 2.8 GHz at 13.1 dBm of the input power. Additionally, at 2.45 GHz, the PCE varies in the range of 60.8% and 72.6% within the entire <inline-formula> <tex-math notation=\"LaTeX\">$Delta varphi $ </tex-math></inline-formula> range (0°–360°). Thus, the obtained PCE variation (<inline-formula> <tex-math notation=\"LaTeX\">$Delta eta$ </tex-math></inline-formula>) is 11.8%. Considering its excellent broadband and WIA features, it is very suitable for high-efficiency radio-frequency (RF) energy harvesting (RFEH) systems.","PeriodicalId":13130,"journal":{"name":"IEEE Microwave and Wireless Components Letters","volume":"32 1","pages":"1483-1486"},"PeriodicalIF":3.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45489919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/LMWC.2022.3189347
Omar Z. Alngar, A. Barakat, R. Pokharel
A two-stage 180-nm CMOS wideband (14–22 GHz) power amplifier (PA) with a superimposed staggered technique and defected-ground-structure (DGS) inductors is introduced, where a wideband peaking main stage is designed at the center frequency; then, a superimposed dual-band (SDB) driver stage is proposed to obtain the optimally flat gain response over the whole bandwidth (BW). Also, DGS inductors are used to enhance the power added efficiency (PAE) of the implemented PA by decreasing the matching circuits’ insertion losses. The proposed PA achieved a power gain of 12 dB at a total chip area of 0.564 mm2. Also, at the center frequency, it achieved a saturated output power of 16.6 dBm exhibiting the smallest reported amplitude-to-phase (AM-PM) distortion (2.1°) and group delay (GD) variations (±66 ps). Finally, it gives among the highest fractional bandwidth (FBW) (44.4%) and the PAE (18.7%) so far. Also, it achieves an error vector magnitude of −25 dB at 9.3-dBm output power for a 400-MHz 5G-NR signal.
{"title":"High PAE CMOS Power Amplifier With 44.4% FBW Using Superimposed Dual-Band Configuration and DGS Inductors","authors":"Omar Z. Alngar, A. Barakat, R. Pokharel","doi":"10.1109/LMWC.2022.3189347","DOIUrl":"https://doi.org/10.1109/LMWC.2022.3189347","url":null,"abstract":"A two-stage 180-nm CMOS wideband (14–22 GHz) power amplifier (PA) with a superimposed staggered technique and defected-ground-structure (DGS) inductors is introduced, where a wideband peaking main stage is designed at the center frequency; then, a superimposed dual-band (SDB) driver stage is proposed to obtain the optimally flat gain response over the whole bandwidth (BW). Also, DGS inductors are used to enhance the power added efficiency (PAE) of the implemented PA by decreasing the matching circuits’ insertion losses. The proposed PA achieved a power gain of 12 dB at a total chip area of 0.564 mm2. Also, at the center frequency, it achieved a saturated output power of 16.6 dBm exhibiting the smallest reported amplitude-to-phase (AM-PM) distortion (2.1°) and group delay (GD) variations (±66 ps). Finally, it gives among the highest fractional bandwidth (FBW) (44.4%) and the PAE (18.7%) so far. Also, it achieves an error vector magnitude of −25 dB at 9.3-dBm output power for a 400-MHz 5G-NR signal.","PeriodicalId":13130,"journal":{"name":"IEEE Microwave and Wireless Components Letters","volume":"32 1","pages":"1423-1426"},"PeriodicalIF":3.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45884199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/LMWC.2022.3177403
A. Moradkhani, Omid Hasannejad, M. Baghelani
This letter presents a novel method for distance variation robustness enhancement of microwave resonator-based sensor using artificial intelligence. Since any small change in the distance of the material under the test to the microwave resonator sensors results in significant shifts in their resonance frequency, the performance of these sensors is very susceptible to movements of the measuring system. By utilizing multiple features of the wideband spectrum of the resonators including the frequency, amplitude, and the quality factor of two resonance harmonics of a microwave resonator, a multilayer perceptron (MLP) neural network is trained to measure the volumetric concentrations of biofuel liquids in various liquid to resonator distances. The average errors of as small as 2% for both gasoline and ethanol are measured over a distance variation of as large as from 1 to 6 mm for the liquid under the test from the resonator.
{"title":"An Artificial Intelligence Assisted Distance Variation Robust Microwave Sensor for Biofuel Analysis Applications","authors":"A. Moradkhani, Omid Hasannejad, M. Baghelani","doi":"10.1109/LMWC.2022.3177403","DOIUrl":"https://doi.org/10.1109/LMWC.2022.3177403","url":null,"abstract":"This letter presents a novel method for distance variation robustness enhancement of microwave resonator-based sensor using artificial intelligence. Since any small change in the distance of the material under the test to the microwave resonator sensors results in significant shifts in their resonance frequency, the performance of these sensors is very susceptible to movements of the measuring system. By utilizing multiple features of the wideband spectrum of the resonators including the frequency, amplitude, and the quality factor of two resonance harmonics of a microwave resonator, a multilayer perceptron (MLP) neural network is trained to measure the volumetric concentrations of biofuel liquids in various liquid to resonator distances. The average errors of as small as 2% for both gasoline and ethanol are measured over a distance variation of as large as from 1 to 6 mm for the liquid under the test from the resonator.","PeriodicalId":13130,"journal":{"name":"IEEE Microwave and Wireless Components Letters","volume":"32 1","pages":"1475-1478"},"PeriodicalIF":3.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47073845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/LMWC.2022.3193693
J. Mendoza, G. Mumcu
A microfluidically reconfigurable slow wave phase shifter (MRPS) with integrated actuation is introduced. MRPS is based on a selectively metalized plate (SMP) repositionable within a microfluidic channel placed in close proximity to a microstrip line. SMP repositioning creates a variable capacitive loading to alter the speed of the propagating wave. The device exhibits < 2 dB insertion loss (IL) and a reconfiguration time of 50 ms. The $|S_{21}|$ , $|S_{11}|$ , and phase performances are characterized to be stable with respect to gravity by no more than 0.16 dB, 3.02 dB, and 7.73° variations, respectively. Vibration test shows 0.08 dB in IL, 1.72 dB in return loss (RL), and 4.23° in phase variations. The device is expected to handle 5.2 W of continuous RF power.
{"title":"Microfluidically Reconfigurable mm-Wave Slow Wave Phase Shifter With Integrated Actuation","authors":"J. Mendoza, G. Mumcu","doi":"10.1109/LMWC.2022.3193693","DOIUrl":"https://doi.org/10.1109/LMWC.2022.3193693","url":null,"abstract":"A microfluidically reconfigurable slow wave phase shifter (MRPS) with integrated actuation is introduced. MRPS is based on a selectively metalized plate (SMP) repositionable within a microfluidic channel placed in close proximity to a microstrip line. SMP repositioning creates a variable capacitive loading to alter the speed of the propagating wave. The device exhibits < 2 dB insertion loss (IL) and a reconfiguration time of 50 ms. The <inline-formula> <tex-math notation=\"LaTeX\">$|S_{21}|$ </tex-math></inline-formula>, <inline-formula> <tex-math notation=\"LaTeX\">$|S_{11}|$ </tex-math></inline-formula>, and phase performances are characterized to be stable with respect to gravity by no more than 0.16 dB, 3.02 dB, and 7.73° variations, respectively. Vibration test shows 0.08 dB in IL, 1.72 dB in return loss (RL), and 4.23° in phase variations. The device is expected to handle 5.2 W of continuous RF power.","PeriodicalId":13130,"journal":{"name":"IEEE Microwave and Wireless Components Letters","volume":"32 1","pages":"1415-1418"},"PeriodicalIF":3.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44037238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/LMWC.2022.3187609
B. Choi, Jeong‐Hae Lee
In general, it is known that magnetic induction (MI) wireless power transfer (WPT) is used at a short distance (~several millimeters) and magnetic resonance (MR) WPT is applied at a longer distance (more than several tens of centimeters). In this letter, it is shown that the MR coil can be robustly designed to have higher efficiency, even when the load impedance changes significantly at short distances. The simulated power transfer efficiencies of MI and MR coil show that the MR coil was more insensitive to load impedance than the MI coil. A 1:4 single input and multiple output (SIMO) MR coil wasdesigned and fabricated. Its performance with the variation of load impedance was verified through measurement.
{"title":"Efficient Magnetic Resonance SIMO WPT Insensitive to Load Impedance at Short Distances","authors":"B. Choi, Jeong‐Hae Lee","doi":"10.1109/LMWC.2022.3187609","DOIUrl":"https://doi.org/10.1109/LMWC.2022.3187609","url":null,"abstract":"In general, it is known that magnetic induction (MI) wireless power transfer (WPT) is used at a short distance (~several millimeters) and magnetic resonance (MR) WPT is applied at a longer distance (more than several tens of centimeters). In this letter, it is shown that the MR coil can be robustly designed to have higher efficiency, even when the load impedance changes significantly at short distances. The simulated power transfer efficiencies of MI and MR coil show that the MR coil was more insensitive to load impedance than the MI coil. A 1:4 single input and multiple output (SIMO) MR coil wasdesigned and fabricated. Its performance with the variation of load impedance was verified through measurement.","PeriodicalId":13130,"journal":{"name":"IEEE Microwave and Wireless Components Letters","volume":"32 1","pages":"1463-1466"},"PeriodicalIF":3.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45406457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/LMWC.2022.3181183
Jingjing Li, Shixing Yu, N. Kou, Zhao Ding, Zhengping Zhang
In this letter, we design a magnetically coupled resonant wireless power transfer (MCR-WPT) system on the conformal cylindrical surface based on the flexible printed circuit (FPC) coils. The coil has the advantages of small size, lightweight, and high bendability. We combine mathematics and simulations to explore the relationship between the self-inductance/mutual inductance of the flexible coil and the bending radius of the conformal cylindrical surface. Both theoretical and simulation results show that as the bending radius decreases linearly, the self-inductance and mutual inductance of the coil also decrease nonlinearly. In addition, as the bending radius decreases, the transmission efficiency (TE) decreases, and the resonant frequency shifts to a higher range. Finally, measured and simulated results agree well, which further validates the conclusions.
{"title":"Cylindrical Magnetically Coupled Resonant Wireless Power Transfer System Based on Flexible PCB Coils","authors":"Jingjing Li, Shixing Yu, N. Kou, Zhao Ding, Zhengping Zhang","doi":"10.1109/LMWC.2022.3181183","DOIUrl":"https://doi.org/10.1109/LMWC.2022.3181183","url":null,"abstract":"In this letter, we design a magnetically coupled resonant wireless power transfer (MCR-WPT) system on the conformal cylindrical surface based on the flexible printed circuit (FPC) coils. The coil has the advantages of small size, lightweight, and high bendability. We combine mathematics and simulations to explore the relationship between the self-inductance/mutual inductance of the flexible coil and the bending radius of the conformal cylindrical surface. Both theoretical and simulation results show that as the bending radius decreases linearly, the self-inductance and mutual inductance of the coil also decrease nonlinearly. In addition, as the bending radius decreases, the transmission efficiency (TE) decreases, and the resonant frequency shifts to a higher range. Finally, measured and simulated results agree well, which further validates the conclusions.","PeriodicalId":13130,"journal":{"name":"IEEE Microwave and Wireless Components Letters","volume":"32 1","pages":"1479-1482"},"PeriodicalIF":3.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45705506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/LMWC.2022.3195193
Haidong Wu, Gang Dong, Wei Xiong, Chang Zhi, Shen Li, Zhangming Zhu, Yintang Yang
This letter presents an accurate magnetic coupling coefficient ($k$ ) model for a through-silicon via (TSV)-based 3-D transformer. The $k$ factor can be precisely derived from the self-inductance and mutual inductance, which are calculated by various analytical formulas based on physical geometries. The results of this model correspond well with those of Q3D extractor and high-frequency structural simulator (HFSS), with maximum errors of 3.8% and 4.4%, respectively. An equivalent circuit model of a TSV-based transformer is used for further verification. The S-parameters obtained by the circuit model match well with the measurements.
{"title":"Accurate Magnetic Coupling Coefficient Modeling of 3-D Transformer Based on TSV","authors":"Haidong Wu, Gang Dong, Wei Xiong, Chang Zhi, Shen Li, Zhangming Zhu, Yintang Yang","doi":"10.1109/LMWC.2022.3195193","DOIUrl":"https://doi.org/10.1109/LMWC.2022.3195193","url":null,"abstract":"This letter presents an accurate magnetic coupling coefficient (<inline-formula> <tex-math notation=\"LaTeX\">$k$ </tex-math></inline-formula>) model for a through-silicon via (TSV)-based 3-D transformer. The <inline-formula> <tex-math notation=\"LaTeX\">$k$ </tex-math></inline-formula> factor can be precisely derived from the self-inductance and mutual inductance, which are calculated by various analytical formulas based on physical geometries. The results of this model correspond well with those of Q3D extractor and high-frequency structural simulator (HFSS), with maximum errors of 3.8% and 4.4%, respectively. An equivalent circuit model of a TSV-based transformer is used for further verification. The S-parameters obtained by the circuit model match well with the measurements.","PeriodicalId":13130,"journal":{"name":"IEEE Microwave and Wireless Components Letters","volume":"32 1","pages":"1419-1422"},"PeriodicalIF":3.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42412003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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