Microwave and Optical Technology Letters最新文献

{"title":"Wireless Control of Active FSS With Amplitude Sensing Module","authors":"Songran Guo,&nbsp;Yi Wang,&nbsp;Yu Xie","doi":"10.1002/mop.70242","DOIUrl":"https://doi.org/10.1002/mop.70242","url":null,"abstract":"<div>\u0000 \u0000 <p>An active frequency selective surface (FSS) system is designed, in which the working states are wirelessly controlled by the amplitude of the incoming electromagnetic wave. A sensing module is designed to detect the incident EM wave amplitude with an adjustable threshold, capable of providing a controllable output voltage of up to 36 V. This voltage is then utilized to control the active FSS, enabling transmission or reflection functions in 2.28–2.48 GHz. The sensing module and the FSS are fully integrated, simulated, and experimentally validated. The final measurement results agree well with the simulations, thus proving the effectiveness of the proposed technique.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144091779","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}

{"title":"A Low-Profile Magneto-Electric Dipole Filtering Antenna With Circularly Polarization","authors":"Sheng Zhang,&nbsp;Enhui Zhao,&nbsp;Xilong Wu,&nbsp;Hongliang Qiao,&nbsp;Xiaopeng Shen","doi":"10.1002/mop.70239","DOIUrl":"https://doi.org/10.1002/mop.70239","url":null,"abstract":"<div>\u0000 \u0000 <p>This letter presents a novel low-profile magneto-electric (ME) dipole circularly polarized (CP) filtering antenna. Its filtering response is obtained by three radiation nulls. One of them is an intrinsic radiation null of the ME dipole and the other two radiation nulls are introduced by an asymmetric feeding structure. Additionally, the CP radiation is developed by connecting the diagonal patches and loading the shorted patches around the main patches. The CP filtering antenna is fabricated and measured. The proposed ME dipole antenna is implemented on a two-layer substrate with a compact thickness of 0.081λ₀, demonstrating an axial ratio bandwidth of 16.4% (4.85–5.72 GHz). The structure exhibits enhanced out-of-band rejection characteristics, achieving suppress levels exceeding 13 dB. The theoretical performances are verified by the measured results.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144091781","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}

{"title":"Polarization-Reconfigurable Multi-Antenna for High Mutual Coupling Reduction Using Backload Parasitic Structure","authors":"Guowen Ding,&nbsp;Fan Ye,&nbsp;Xiaoge Zhang,&nbsp;Xin-Yao Luo,&nbsp;Shen-Yun Wang,&nbsp;Ke Chen,&nbsp;Yijun Feng,&nbsp;Wen Geyi","doi":"10.1002/mop.70232","DOIUrl":"https://doi.org/10.1002/mop.70232","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper introduces a polarization-reconfigurable antenna array with reduced mutual coupling achieved by incorporating a backloaded parasitic structure, which is an easily loaded design. The proposed antenna array achieves high isolation while switching among arbitrary linear polarizations (LPs), left-hand circular polarization (LHCP), and right-hand circular polarization (RHCP). The proposed method is simple, feasible and capable of achieving high isolation of over 30 dB of the mutual coupling at the operating frequency by adding a backloaded parasitic structure without the need to modify the parameters of original antenna. As a proof of concept, a 2 × 2 antenna array was designed, fabricated and measured to demonstrate the polarized-reconfigurable performance of the antenna and the effectiveness of the easy-loading structure to reduce the couplings.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144085435","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}

{"title":"Retrodirective Chipless RFID With Cross-Polarized Frequency Encoding","authors":"Kevin Xu,&nbsp;Jun H. Choi","doi":"10.1002/mop.70238","DOIUrl":"https://doi.org/10.1002/mop.70238","url":null,"abstract":"<div>\u0000 \u0000 <p>This letter presents a new configuration of fully passive frequency-encoded chipless RFIDs with improved detectability at oblique angles of incidence and in the presence of clutter. The proposed architecture is comprised of a wideband Van Atta retrodirective array that rotates the polarization of the retransmitted signal by 90°. The presence or absence of stopbands, generated by resonators along the feed lines, form a unique binary ID across frequency in the retrodirected signal. By using an array to point a cross-polarized beam toward the source, power transfer (and thus, range) is increased while reflections from surrounding objects are minimized. As a result, robust and affordable RFID tags may be designed for operation in cluttered environments with an optimal range of distances and angles. A prototype operating from 2.5 to 3.0 GHz is fabricated, and the monostatic radar cross section (RCS) is measured across frequency to demonstrate the retrodirective frequency-encoded chipless RFID concept.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144085433","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}

{"title":"Research on Temperature Compensation of TDLAS Gas Detection System Based on WOA-SSA-BP Modeling","authors":"Tingting Zhang,&nbsp;Chunsheng Li,&nbsp;Yubin Wei,&nbsp;Jiqiang Wang,&nbsp;Li Wang,&nbsp;Yefeng Gu,&nbsp;Wei Wang,&nbsp;Qinduan Zhang","doi":"10.1002/mop.70234","DOIUrl":"https://doi.org/10.1002/mop.70234","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper presents a novel WOA-SSA-BP model to improve the measurement accuracy of tunable diode laser absorption spectroscopy (TDLAS) gas detection systems in variable temperature environments. The model integrates the efficient search capability of the Whale Optimization Algorithm (WOA), the local exploration capability of the Sparrow Search Algorithm (SSA), and the powerful data fitting capability of the Backpropagation Neural Network (BPNN), forming a collaborative optimization algorithm architecture. The model aims to achieve precise correction of ethane (C₂H₆) concentration by accounting for the impacts of three aspects: the variation in gas characteristic spectral line intensity due to temperature fluctuations, the performance instability of infrared light sources, and the electrical property instability of electronic components. The experimental results demonstrate that the WOA-SSA-BP model outperforms the conventional BPNN, WOA-BP, and SSA-BP models. The model exhibits a maximum prediction error of merely 0.29 ppm, alongside an exceptional linear regression coefficient of 0.99998, evidencing its high precision and reliability. Such results suggest that the WOA-SSA-BP model adeptly compensates for the effects of varying temperatures on the TDLAS gas detection system.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144085434","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}

{"title":"Optimization of All-Fiber Calibration-Free Wavelength-Modulated Laser Heterodyne System for Methane (CH4) Atmospheric Detection","authors":"Chunyan Sun,&nbsp;Xueping Pan,&nbsp;Chencheng Qiu,&nbsp;Bowen Zhang,&nbsp;Jin Bai,&nbsp;Liwei Zhang,&nbsp;Peng Cheng,&nbsp;WangPing Cheng","doi":"10.1002/mop.70236","DOIUrl":"https://doi.org/10.1002/mop.70236","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper presents a calibration-free wavelength-modulated laser heterodyne radiometer (CF-WM-LHR) system, including the LabVIEW-designed software signal generator and software digital lock-in amplifier, monitors atmospheric methane (CH₄) column concentration in real-time. Hefei Institute of Physical Sciences experiments with specific laser and SR830 settings acquire six signals per measurement. The 2 <i>f</i> signal of CH₄ reaches near its maximum at a 0.28 V optimal modulation voltage. A 395–520 MHz bandpass achieves 250 MHz (0.0083 cm⁻¹) spectral resolution. Compared with SR830, the software digital lock-in amplifier can demodulate multiple signals and attain an improved 2 <i>f</i>/1 <i>f</i> SNR of 429.3. The CF-WM-LHR system provides new greenhouse gas detection methods, and the software digital lock-in amplifier is crucial for inversion.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949744","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}

{"title":"Multiobjective Synthesis of Ultra-Wideband Array Antennas in the Time Domain With High-Power Pulse","authors":"Xinyu Jiang,&nbsp;Youjie Yan,&nbsp;Kaiyue Zhang,&nbsp;Chengyun Cao,&nbsp;Liangjie Bi,&nbsp;Lin Meng","doi":"10.1002/mop.70228","DOIUrl":"https://doi.org/10.1002/mop.70228","url":null,"abstract":"<div>\u0000 \u0000 <p>Ultra-wideband (UWB) is a typical high-power electromagnetic (HPEM) interference environment. The important parameters that affect the performance of UWB HPEM simulators include electric field strength (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>E</mi>\u0000 \u0000 <mrow>\u0000 <mi>p</mi>\u0000 \u0000 <mi>p</mi>\u0000 </mrow>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${E}_{pp}$</annotation>\u0000 </semantics></math>), waveform consistency (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>t</mi>\u0000 \u0000 <mrow>\u0000 <mi>p</mi>\u0000 \u0000 <mi>p</mi>\u0000 \u0000 <mi>v</mi>\u0000 \u0000 <mi>a</mi>\u0000 \u0000 <mi>r</mi>\u0000 </mrow>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${t}_{ppvar}$</annotation>\u0000 </semantics></math>), and test space (half-power beamwidth (HPBW)). In this letter, the constrained multiobjective optimization algorithm NSGA-II is used to optimize the time delay of the array element based on the principle of convolution of time domain array patterns. The appropriate solution on the Pareto front according to the actual need is used to realize a stable radiation field with a certain amplitude over a larger test space. Under one of the sets of delays, the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>E</mi>\u0000 \u0000 <mrow>\u0000 <mi>p</mi>\u0000 \u0000 <mi>p</mi>\u0000 </mrow>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${E}_{pp}$</annotation>\u0000 </semantics></math> of this array is reduced by no more than 70% and the HPBW is increased from 16.1° to 24°. The rate of change of pulse width is reduced from 21.5% to 5% corresponds to a more stable spectral. Each element of the array is an antipodal Vivaldi antenna. A 9-element sample of Pareto fronts is simulated by using CST Microwave Studio software. The synthesis results demonstrate the efficiency and accuracy of the method and quickly provide valuable information for array antenna designers.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944461","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}

{"title":"ZEMAX Simulation and Experimental Validation for Tandem Fabry-Perot Interferometers in Brillouin Light Scattering Spectrometer","authors":"Muddasir Naeem,&nbsp;Tayyab Imran,&nbsp;Muhammad Sabieh Anwar","doi":"10.1002/mop.70230","DOIUrl":"https://doi.org/10.1002/mop.70230","url":null,"abstract":"<div>\u0000 \u0000 <p>This study is focused on the ZEMAX OpticStudio design simulation of the Brillouin light scattering (BLS) spectrometer setup based on tandem Fabry-Perot interferometers. The spectrometer consists of two Fabry-Perot interferometers arranged in tandem geometry, allowing the incoming spectra to pass through them six times. Simulations were performed in alignment and tandem modes. The alignment requirements of the system were meticulously outlined, and computations were conducted to validate the operational concept. Experimental results from the BLS spectrometer were also obtained and compared with simulation data. The comparison revealed a reasonable agreement between the OpticStudio simulations and experimental measurements, confirming the accuracy of the simulated model. This study underscores the effectiveness of using ZEMAX OpticStudio for optimization and highlights the potential of the BLS spectrometer for precise low-frequency material wave detection in field applications.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944462","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}

{"title":"Self-Decoupling Copolarized in-Band Full Duplex Dipole Antenna With Symmetrical Radiation Patterns","authors":"Chao Jun Ma,&nbsp;Yong Xi Song,&nbsp;Jun Chang,&nbsp;Rong Rong Qian","doi":"10.1002/mop.70235","DOIUrl":"https://doi.org/10.1002/mop.70235","url":null,"abstract":"<div>\u0000 \u0000 <p>Existing copolarized in-band full duplex (IBFD) antennas often suffer from an asymmetrical radiation pattern. To address this issue, a simple self-decoupling method and corresponding radiation pattern improvement technology are proposed in this letter. By exciting a superposed mode produced through two higher order modes of a widened planar dipole, a specific superposed <i>E</i>-field pattern can be constructed, on which the TX port and RX port can be located at a strong- and a weak-field region, respectively. As a result, a self-decoupling between the two ports is realized without any extra decoupling structures. Based on the self-decoupling method, by simply optimizing the widened dipole's shape, the electric field and surface current on the antenna are therefore adjusted, and a symmetrical radiation pattern can be realized. Simulation demonstrates that the symmetry degree of the proposed antenna is greater than 0.5 dB within −60° ≤ <i>θ</i> ≤ 60°, which is better than existing relevant works. Experimental verification shows that the antenna achieves an impedance bandwidth of 3.38–3.8 GHz (11.7%) and a maximum in-band isolation of 36.65 dB.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938933","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}

{"title":"A Novel Filtering Dielectric Resonator Antenna With Enhanced Gain","authors":"Tiancheng Qiu,&nbsp;Gao Wei,&nbsp;Siyuan Lei,&nbsp;Min Wang,&nbsp;Changying Wu,&nbsp;Jianzhou Li,&nbsp;Kuisong Zheng","doi":"10.1002/mop.70227","DOIUrl":"https://doi.org/10.1002/mop.70227","url":null,"abstract":"<div>\u0000 \u0000 <p>In this letter, a novel rectangular filtering dielectric resonator antenna (FDRA) using a fusion design approach with enhanced gain is proposed. An extended microstrip stub and a pair of U-shape metal strips are elaborately designed and loaded to provide two radiation nulls at the edges of the passband. Besides, a mushroom-like electromagnetic band gap (EBG) structure is arranged around the DRA to generate the third radiation null. Consequently, a good filtering response is obtained without extra filtering circuits. In addition, three radiation nulls can be controlled independently by adjusting the length of the extended microstrip stub, the U-shape metal strips and sizes of EBG structure. A prototype FDRA is fabricated and measured for demonstration. The reflection coefficient, the radiation pattern, the antenna gain and total efficiency are studied, and reasonable agreement between the measured and simulated results is observed. The prototype owns a 10-dB impedance bandwidth of 12% (4.63–5.23 GHz), a peak realized gain of 7.32 dBi and a high out-of-band suppression level of 27.4 dB at the lower stopband, respectively. Besides, a cross-polarization discrimination of more than 27 dB in each plane is obtained.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938931","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}