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Developing a High-Power Metal-Plate Lens Antenna for Microwave Fracturing of Rocks
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2025-03-12 DOI: 10.1002/mop.70169
Yanlong Zheng, Zhongjun Ma, Jianchun Li
{"title":"Developing a High-Power Metal-Plate Lens Antenna for Microwave Fracturing of Rocks","authors":"Yanlong Zheng,&nbsp;Zhongjun Ma,&nbsp;Jianchun Li","doi":"10.1002/mop.70169","DOIUrl":"https://doi.org/10.1002/mop.70169","url":null,"abstract":"<div>\u0000 \u0000 <p>This study presents the design and experimental validation of a high-power metal-plate lens antenna for efficient microwave fracturing of rocks in the near-field. The antenna integrates a horn feed with a biconcave metal-plate lens to achieve extended working distances and enhanced power focusing. Through numerical simulations, the antenna demonstrated a maximum microwave power density of 22 W/cm² on diabase rock surfaces at 6 kW input power with a 36 cm irradiation distance. The reflection coefficient remained below −10 dB across irradiation distances of 20–50 cm, confirming robust energy transmission. Rock fracturing tests revealed that the antenna effectively induced thermal cracking at 36 cm, achieving a peak surface temperature of 270°C after 4 min of irradiation. The results highlight the antenna's ability to maintain focused microwave energy over practical working distances, offering significant potential for deployment in tunneling and mechanical excavation where conventional antennas face limitations. This work advances high-power microwave applications in geotechnical engineering by addressing critical challenges in power delivery and operational range.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Denoising and Recognition Matching Algorithm of Projectile Signal in Infrared Light Screens Based on HOA-VMD
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2025-03-12 DOI: 10.1002/mop.70166
Yu Zhao, Hanshan Li
{"title":"A Denoising and Recognition Matching Algorithm of Projectile Signal in Infrared Light Screens Based on HOA-VMD","authors":"Yu Zhao,&nbsp;Hanshan Li","doi":"10.1002/mop.70166","DOIUrl":"https://doi.org/10.1002/mop.70166","url":null,"abstract":"<div>\u0000 \u0000 <p>Aiming at the problem of low detection ability and low signal-to-noise ratio of infrared light screens under strong background light conditions, this paper proposes a denoising and recognition matching method of projectile signal in infrared light screens based on HOA-VMD under strong background light conditions. It combines the hiking optimization algorithm (HOA) and the variational mode decomposition (VMD) to decompose the signal and extract the effective components, then the wavelet layered threshold function is used for multi-scale denoising to effectively filter out the noise interference of the strong background light. Based on the theoretical velocity of the flying projectile, the dynamic time warping (DTW) algorithm is used to recognize and match the multi-target signals, and the performance of the infrared light screens is improved. The experimental results show that this method can effectively improve the processing accuracy of infrared light screens signal under strong background light conditions. Compared with the existing VMD denoising, EMD denoising, wavelet soft threshold denoising and wavelet hard threshold denoising methods, the signal-to-noise ratio is increased by 24.05%, 36.09%, 43.67%, and 48.46%, respectively. It can accurately eliminate the interference signal and retain the real projectile signal.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143602448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dual-Band Dual-Circularly Polarized Aperture-Shared Antenna Based on SIW for Millimeter-Wave/Sub-6 GHz Communication Applications
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2025-03-12 DOI: 10.1002/mop.70163
Mu-Mei He, Zhi-Hong Tu, Na Nie
{"title":"Dual-Band Dual-Circularly Polarized Aperture-Shared Antenna Based on SIW for Millimeter-Wave/Sub-6 GHz Communication Applications","authors":"Mu-Mei He,&nbsp;Zhi-Hong Tu,&nbsp;Na Nie","doi":"10.1002/mop.70163","DOIUrl":"https://doi.org/10.1002/mop.70163","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, a dual-band dual-circularly polarized antenna based on substrate integrated waveguide (SIW) is proposed. The proposed antenna adopts a fusion structure to reuse the whole millimeter-wave antenna as the upper structure of the microwave antenna, which leads to the aperture reuse ratio is 1. The whole antenna size is 0.98λ<sub>0</sub> × 0.98λ<sub>0</sub> × 0.045λ<sub>0</sub>, where λ<sub>0</sub> is the free-space wavelength at the low-band center frequency. Meanwhile, the frequency ratio can be adjusted by modifying the position of the vias and the distance of the vias on the diagonal of the microwave antenna. Furthermore, the polarization modes right-handed circular polarization/left-handed circular polarization (RHCP/LHCP) in both bands can be adjusted flexibly by turning the phase sequence of the feed network. The measured results show that the design achieves the impedance bandwidths of 2.3% and 17.9%, AR bandwidths of 1.3% and 10.7%, with gains of 7.8 and 13.8 dB at 5.3 and 25 GHz, respectively. The proposed microwave and mm-Wave dual-band dual circularly polarized shared-aperture antenna provides a promising candidate for 5G communication applications.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A High Efficiency Three-Way Power Combiner Used in SSPA
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2025-03-12 DOI: 10.1002/mop.70171
Hai-Xu Liu, Yong-Hong Zhang, Xiao-Dong Gong, Jia-Wei Liu
{"title":"A High Efficiency Three-Way Power Combiner Used in SSPA","authors":"Hai-Xu Liu,&nbsp;Yong-Hong Zhang,&nbsp;Xiao-Dong Gong,&nbsp;Jia-Wei Liu","doi":"10.1002/mop.70171","DOIUrl":"https://doi.org/10.1002/mop.70171","url":null,"abstract":"<div>\u0000 \u0000 <p>A high efficiency three-way power combiner used in solid state power amplifier (SSPA) is proposed in this letter. The power combiner is a six ports circuit composing of cover plate, PCB and base plate, which can achieve three-way signals power combining with broadband and high isolation. Compared with the existing three-way power combiner, branch microstrip lines are adopted instead of isolation resistors between branch lines, and this structure can avoid resistance loss and improve power combining efficiency. From the measured results, less than 4.8 ± 0.2 dB of the three equivalent insertion losses, more than 21 dB of the return loss, and better than 19 dB of isolation from 6.5 to 8 GHz can be achieved. Further processing and testing of back-to-back samples were carried out, and the power combining efficiency of the combiner reached over 94.4%. Based on the combiner, a 200 W solid-state power amplifier was developed with a DC efficiency of 37.5%.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhancing ASED Basis Function Method With Compressive Sensing for Fast Analysis of Large-Scale Finite Periodic Arrays
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2025-03-10 DOI: 10.1002/mop.70168
Mingrui Ou, Yufa Sun, Fei Huang, Pan Wang
{"title":"Enhancing ASED Basis Function Method With Compressive Sensing for Fast Analysis of Large-Scale Finite Periodic Arrays","authors":"Mingrui Ou,&nbsp;Yufa Sun,&nbsp;Fei Huang,&nbsp;Pan Wang","doi":"10.1002/mop.70168","DOIUrl":"https://doi.org/10.1002/mop.70168","url":null,"abstract":"<div>\u0000 \u0000 <p>The accurate subentire-domain (ASED) basis function method has been demonstrated to be effective in analyzing large-scale finite periodic array problems. However, as the array size increases, both the full calculation of the impedance matrix and the solution of the reduced matrix becomes increasingly time-consuming. To address this issue, a novel compressive sensing (CS) model employing the ASED basis functions as a sparse base is presented in this letter. On one hand, the reduced matrix equation is replaced by the CS equation, which can be more efficiently constructed and solved. On the other hand, only very few rows of impedance matrix need to be filled for constructing the measurement matrix. Numerical examples are calculated to verify the computational efficiency and accuracy of the proposed method.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Wideband Triple-Resonance Cavity-Backed Slot Antenna Utilizing a Single Metal Cavity
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2025-03-10 DOI: 10.1002/mop.70165
Zhi-Cai Liao, Rui-Sen Chen, Qiang Shao, Guan-Long Huang, Mustafa K. Taher Al-Nuaimi, Jingtao Zeng, Hua Yang, Sai-Wai Wong
{"title":"Wideband Triple-Resonance Cavity-Backed Slot Antenna Utilizing a Single Metal Cavity","authors":"Zhi-Cai Liao,&nbsp;Rui-Sen Chen,&nbsp;Qiang Shao,&nbsp;Guan-Long Huang,&nbsp;Mustafa K. Taher Al-Nuaimi,&nbsp;Jingtao Zeng,&nbsp;Hua Yang,&nbsp;Sai-Wai Wong","doi":"10.1002/mop.70165","DOIUrl":"https://doi.org/10.1002/mop.70165","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, a wideband triple-resonance cavity-backed slot antenna with a simple structure is proposed. The antenna is composed of a feeding probe, a metal cavity, and a rectangular radiating slot on the top wall. The rectangular slot can produce a resonant-iris mode, the feeding probe can produce a coaxial-cavity mode, and the metal cavity can produce a cavity mode. By combining these three mixed resonant modes in a single cavity, the antenna can achieve a wide operating bandwidth as well as a simple antenna structure. The measured results demonstrate that the proposed triple-resonance full-metal cavity-backed slot antenna can achieve 70% bandwidth and also has a stable radiation pattern over the entire operating band.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design of an Ultra-Wideband and Wide-Angle Absorber Based on ITO-FSA for EM Stealth
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2025-03-07 DOI: 10.1002/mop.70156
Jingkai Xue, Linwan Deng, Hong Lu, Jiahao Chen, Fengling Peng, Xing Chen
{"title":"Design of an Ultra-Wideband and Wide-Angle Absorber Based on ITO-FSA for EM Stealth","authors":"Jingkai Xue,&nbsp;Linwan Deng,&nbsp;Hong Lu,&nbsp;Jiahao Chen,&nbsp;Fengling Peng,&nbsp;Xing Chen","doi":"10.1002/mop.70156","DOIUrl":"https://doi.org/10.1002/mop.70156","url":null,"abstract":"<div>\u0000 \u0000 <p>In this letter, an electromagnetic stealth composite superlattice-type structure based on indium tin oxides (ITO) resistive film and frequency selective absorber (FSA) is proposed for radar cross section (RCS) reduction. It exhibits impressive ultra-wideband performance with absorption of more than 85% (RCS reduction 8.2 dB) spanning from 0.94 to 23.2 GHz (relative bandwidth 184.8%). The proposed absorber is also polarization-insensitive and has angular incidence stability up to 45° and 60° for TE and TM polarizations, respectively. Additionally, it demonstrates excellent miniaturization characteristics, with a cell size of only 0.15<i>λ</i><sub><i>L</i></sub> × 0.15<i>λ<sub>L</sub></i> × 0.09<i>λ<sub>L</sub></i>, which provides a technical solution for research and application in related fields.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143564729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Low-Cost, Light-Weight Single-Pole Double-Throw Mechanical Switch Using Gap Waveguide Technology
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2025-03-07 DOI: 10.1002/mop.70161
Mohammad Ali Shamir, Ali Karami Horestani, Mahmoud Talafi Noghani, Fatemeh Sadeghikia
{"title":"A Low-Cost, Light-Weight Single-Pole Double-Throw Mechanical Switch Using Gap Waveguide Technology","authors":"Mohammad Ali Shamir,&nbsp;Ali Karami Horestani,&nbsp;Mahmoud Talafi Noghani,&nbsp;Fatemeh Sadeghikia","doi":"10.1002/mop.70161","DOIUrl":"https://doi.org/10.1002/mop.70161","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper presents a novel single-pole double-throw (SPDT) mechanical switch using gap waveguide (GWG) technology. The design is based on the fact that no electrical connection between the upper and lower plates of GWGs is required. The proposed switch structure comprises two distinct components: the first is a fixed waveguiding section, while the second is a movable section used to switch between ports. Although the proposed method is general, for demonstration purposes, an SPDT switch for Ku-band applications is designed, fabricated, and experimentally characterized. The switch is fabricated by soldering pin headers on printed circuit boards (PCBs). The simulation and measurement results demonstrate that the proposed switch exhibits superior performance characteristics compared to other recently published GWG switches. The operating bandwidth, isolation, minimal signal attenuation, and robust power handling capabilities achieved make this switch highly attractive for operation in demanding communication systems.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143564725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Narrowband Bandpass Filter With Wide Stopband Using Mixed Lumped and Distributed Circuits
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2025-03-05 DOI: 10.1002/mop.70158
Yao Chen, Jing Tian, Kai-Da Xu
{"title":"A Narrowband Bandpass Filter With Wide Stopband Using Mixed Lumped and Distributed Circuits","authors":"Yao Chen,&nbsp;Jing Tian,&nbsp;Kai-Da Xu","doi":"10.1002/mop.70158","DOIUrl":"https://doi.org/10.1002/mop.70158","url":null,"abstract":"<div>\u0000 \u0000 <p>A narrowband bandpass filter (BPF) using mixed lumped and distributed circuits is proposed with wide stopband and small circuit size. By loading four lumped capacitors on the two pairs of coupled lines and two open stubs, the periodic harmonics generated by the coupled lines and open stubs can be effectively suppressed, resulting in the achievement of wideband stopband. To validate the design, a narrowband BPF prototype with center frequency <i>f</i><sub>0</sub> at 1 GHz is fabricated, whose measured 3-dB fractional bandwidth is 5% (0.97–1.02 GHz). The in-band insertion loss is less than 1.5 dB and return loss is greater than 32 dB. The rejection level of stopband is better than −20 dB at the frequency range from 1.05 to 6.22 GHz.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis and Design of Highly Selective Zero-Controlled Band-Pass Multilayer Frequency Selective Surface
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2025-03-04 DOI: 10.1002/mop.70154
Yan Zhang, Dazhi Ding, Tiancheng Zhang, Huaguang Bao, Juan Xu
{"title":"Analysis and Design of Highly Selective Zero-Controlled Band-Pass Multilayer Frequency Selective Surface","authors":"Yan Zhang,&nbsp;Dazhi Ding,&nbsp;Tiancheng Zhang,&nbsp;Huaguang Bao,&nbsp;Juan Xu","doi":"10.1002/mop.70154","DOIUrl":"https://doi.org/10.1002/mop.70154","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, the idea of cross-coupling is applied to realize zero-controllable high-selectivity band-pass frequency selective surface(FSS). The element consists of two resonant layers at the top and bottom and a coupling layer in the middle. Cross-coupling is introduced into the structure, which makes it have electric coupling, magnetic coupling and direct path. Two transmission zeros(TZs) are generated on both sides of the passband, thus realizing the filtering characteristics of fast roll-off. The mechanism of TZs generation is studied by using an equivalent circuit odd-even mode analytical method. Due to its centrosymmetric structure, the FSS has good angular stability and polarization stability. FSS samples with operating frequency at 19.25 GHz, low stop band at 18.2 GHz, and high stop band at 20.8 GHz were fabricated and tested experimentally. The FSS maintains stable performance at an incidence Angle of 75°. The measurement results are in good agreement with the full-wave and circuit simulation results, verifying the design of FSS.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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