Microwave and Optical Technology Letters最新文献

{"title":"Broadband Circularly Polarized Metasurface Antenna Based on Characteristic Mode Analysis","authors":"Juan Xu,&nbsp;Hui Pang,&nbsp;Jianping Zhao,&nbsp;Xiaohui Fang","doi":"10.1002/mop.70129","DOIUrl":"https://doi.org/10.1002/mop.70129","url":null,"abstract":"<div>\u0000 \u0000 <p>A broadband circularly polarized metasurface antenna is proposed. The initial metasurface structure is first diagonally chamfered and a rectangular slot is etched at the chamfer. The chamfering operation can cause an imbalance in the surface impedance of the hypersurface patch, and this imbalance creates a phase difference between the incident wave and the reflected wave, which is considered to be circularly polarized when the phase difference is close to 90° and the amplitudes of the two are equal. Analyze the metasurface structure after chamfering using the characteristic mode theory (CMT), further optimize it based on the obtained characteristic mode analysis results, and analyze it again using the characteristic mode. Finally, two target modes with a phase difference close to 90° were formed. The two characteristic modes are successfully excited by microstrip slot-coupled feeding structure to achieve circularly polarized radiation of the antenna. Finally, the antenna is fabricated and measured. Based on the measured results, it can be observed that the antenna has 35.4% −10 dB impedance bandwidth, and 17% 3 dB axial ratio bandwidth, and the antenna simulated and measured results match.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438765","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":"Wideband Tapered Rod MIMO Antenna for W-Band Applications","authors":"Arpit Kumar Baranwal,&nbsp;Akhilesh Mohan,&nbsp;Nagendra P. Pathak","doi":"10.1002/mop.70145","DOIUrl":"https://doi.org/10.1002/mop.70145","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, a wide band tapered rod two-element MIMO antenna system is designed using a perforated H-guide section for W-band applications. The antenna system comprises of a metallic housing and a perforated H-guide section with tapered input/output dielectric sections. The dielectric section is sandwiched between the two halves of the metallic housing. The designed MIMO antenna is fed by a pair of WR-10 rectangular waveguides. The perforations in the dielectric section not only provide the mechanical stability to the structure but also facilitate high inter-port isolation. The MIMO performance of the designed antenna system is calculated with reference to envelope correlation coefficient (ECC), diversity gain (DG), and channel capacity loss (CCL). These parameters are below the satisfactory range of 0.5, 10 dB, and 0.4 bit/s/Hz. High gain (&gt; 12 dBi), high port-to-port isolation (&gt; 28 dB), and end-fire radiation characteristics of the designed antenna system, make it a potential candidate for W-band communication systems.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143439127","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":"Single-Layer Dual-Polarized Millimeter Wave Slot Antenna Using Nested Radiators Under Four Resonance Modes","authors":"Li Jiawang,&nbsp;Lei Xiang,&nbsp;Yitong Shi,&nbsp;Huimin Liu","doi":"10.1002/mop.70132","DOIUrl":"https://doi.org/10.1002/mop.70132","url":null,"abstract":"<div>\u0000 \u0000 <p>This letter proposes a novel single-layer dual-polarized (DP) millimeter wave (mmWave) low-profile antenna. This antenna is based on a circular substrate integrated waveguide (SIW) resonant cavity. Two different resonant cavities are created by incorporating via fences internally: a conventional circular resonant cavity and a circular ring resonant cavity. The bandwidth is expanded by introducing a central via in the internal resonant cavity, which generates the <i>TM</i>₀₁₀ and <i>TM</i>₁₁₀ resonant modes. On the other hand, the external annular resonant cavity introduces the <i>TM</i>₄₁₀ and <i>TM</i>₅₁₀ resonant modes by carefully adjusting the size of the radiation slot. The radiation slots within the external annular resonant cavity and the inner circular resonant cavity are positioned orthogonally, enabling dual-polarized (DP) operation. It is shown that the DP antenna can achieve the measured −10 dB impedance bandwidths (FBW) of 11.82% (26.26–29.56 GHz) and 11.15% (26.09–29.17 GHz) for port 1 and port 2, respectively. The antenna features stable radiation patterns with an average gain of 5.1 dBi and a high isolation exceeding 20 dB within the passband. The antenna exhibits a single-layer structure, low profile, high-isolation, and low-cost advantages, which can be a good candidate for 5G mmWave indoor applications.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143439105","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 Compact 2.05 μm MOPA Laser With SLM Operation","authors":"Wei Liu,&nbsp;Youlun Ju,&nbsp;Tongyu Dai,&nbsp;Qiang Liu,&nbsp;Chao Liu","doi":"10.1002/mop.70142","DOIUrl":"https://doi.org/10.1002/mop.70142","url":null,"abstract":"<div>\u0000 \u0000 <p>We present a single longitudinal mode Ho:YLF MOPA laser operating at 2050.7 nm by utilizing the Fabry–Perot etalon method to construct a compact SLM seed laser and employing Tm-doped fiber as the amplifier. With an output power of 336 mW generated by the seed laser, the maximum output power of 13.1 W for the single longitudinal mode MOPA laser was recorded at a pump power of 88.7 W. A peak slope efficiency of 26.9% was achieved when the pump power exceeded 58.7 W. To our knowledge, this is the first report of utilizing Tm-doped fiber to amplify the SLM operation of Ho:YLF laser.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431524","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":"Balanced-to-Single-Ended Out-of-Phase Filtering Power Divider With Continuously Tunable Center Frequency and Bandwidth Using Compact Patch Resonators","authors":"Huaiwei Wang,&nbsp;Gang Zhang,&nbsp;Jie Tian,&nbsp;Kam-Weng Tam,&nbsp;Wanchun Tang,&nbsp;Jiquan Yang,&nbsp;Jinlong Zhang,&nbsp;Na Li","doi":"10.1002/mop.70098","DOIUrl":"https://doi.org/10.1002/mop.70098","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper presents a novel compact balanced-to-single-ended out-of-phase filtering power divide with continuously tunable center frequency and bandwidth. By introducing a T-shaped slot on the isosceles right triangle patch resonator to perturb the TM₁₀ mode and exploring varactors-loaded stubs, a new tunable miniaturized patch resonator is created. The proposed filter comprised three new tunable patch resonators connected by back-to-back varactors to adjust bandwidth in between. By studying the electric field distribution of the odd mode TM₁₀ and grounded isolation resistors, the wished out-of-phase output signal and good port-to-port isolation can be generated. Based on such a simple structure, a balanced-to-single-ended out-of-phase filtering power with tunable bandwidth is designed and realized with a center frequency tuning range covering from 1.60 to 1.95 GHz (19.7%) and 3-dB bandwidth tuning range covering from 265 to 328 MHz at 1.90 GHz.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423754","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":"Monolayer WSe2 Film as Saturable Absorbers for Mid-Infrared Passive Q-Switching","authors":"Jie Zheng,&nbsp;Mengyu Zong,&nbsp;Kun Ye,&nbsp;Xiaoyue Feng,&nbsp;Jingjing Liu,&nbsp;Jie Liu,&nbsp;Danhua Liu,&nbsp;Zhongyuan Liu","doi":"10.1002/mop.70119","DOIUrl":"https://doi.org/10.1002/mop.70119","url":null,"abstract":"<div>\u0000 \u0000 <p>The monolayer WSe₂ material was utilized for a saturable absorber to create a 2.7 μm passively Q-switched pulse laser. The maximal single pulse energy was 2.75 µJ, and the highest peak power was measured approximately 2.53 W. As far as we know, this is the first instance of monolayer WSe₂ being used for passive Q-switching operation in mid-infrared. The results provide favorable evidence for monolayer WSe₂ as a mid-infrared Q-switcher and show the promise of monolayer two-dimensional materials for ultrafast pulsed laser applications.</p></div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143248412","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":"Performance Investigation of Hybrid Optical Modulation Techniques for Efficient Utilization of Bandwidth in the Scenario of DWDM Based Optical Fiber Communication System","authors":"Akanksha Singh,&nbsp;Rajinder S. Kaler","doi":"10.1002/mop.70115","DOIUrl":"https://doi.org/10.1002/mop.70115","url":null,"abstract":"<div>\u0000 \u0000 <p>The present work deals with the performance investigation of bandwidth-efficient optical fiber communication systems. In this paper, novel 2-D orthogonal hybrid optical modulation techniques are proposed. In the proposed fiber optic communication system for dense wavelength-division multiplexing (DWDM), optical modulation techniques minimum shift keying (MSK) and pulse amplitude modulation (PAM) are simultaneously modulated at 100 GHz channel spacing with a minimum utilization bandwidth of 4.3 THz. The results show a significant advantage in using the proposed hybrid optical modulation techniques in offering high bandwidth optical signal-to-noise ratio with an acceptable quality factor.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143248713","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":"Dual-Band Shared Aperture Fabry–Perot Cavity Antenna With Beam Deflection","authors":"Xin He,&nbsp;Wenhua Qin,&nbsp;Juan Xu","doi":"10.1002/mop.70121","DOIUrl":"https://doi.org/10.1002/mop.70121","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, a novel partially reflective metasurface (PRS) unit is proposed for beam deflection in a dual-band shared aperture Fabry–Perot cavity antenna (DB-FPA). It operates in the C-band and X-band. Independent control of different frequency bands can be achieved by adjusting the different parameters of the PRS unit. A coaxially fed patch antenna is used as the feed source for the proposed antenna. This antenna exhibits high aperture efficiency and can operate in two bands with a ratio of 1:1.67. The measurements indicate the impedance bandwidth <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <mo>|</mo>\u0000 \u0000 <msub>\u0000 <mi>S</mi>\u0000 \u0000 <mn>11</mn>\u0000 </msub>\u0000 \u0000 <mo>|</mo>\u0000 \u0000 <mo>&lt;</mo>\u0000 \u0000 <mo>−</mo>\u0000 \u0000 <mn>10</mn>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> $|{S}_{11}|lt -10$</annotation>\u0000 </semantics></math> dB of the DB-FPA is 5.54-6.48 GHz (15.6%) and 9.62–10.52 GHz (9%). The gain is 7.15 dBi at 6 GHz with an aperture efficiency of 34.8%, and 8.3 dBi at 10 GHz with an aperture efficiency of 14.5%. The beam deflection of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msup>\u0000 <mn>22</mn>\u0000 \u0000 <mo>∘</mo>\u0000 </msup>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${22}^{circ }$</annotation>\u0000 </semantics></math> at 6 GHz and <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <mo>−</mo>\u0000 \u0000 <msup>\u0000 <mn>54</mn>\u0000 \u0000 <mo>∘</mo>\u0000 </msup>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> $-{54}^{circ }$</annotation>\u0000 </semantics></math> at 10 GHz.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143112040","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":"Erratum to “Tightly Coupled MIMO With Internal Self-Decoupled E-Shaped Design Arms for 5G Mobile Hand-Set”","authors":"","doi":"10.1002/mop.70123","DOIUrl":"https://doi.org/10.1002/mop.70123","url":null,"abstract":"<p>A. Sharma, S. K. Gupta, D. Venkata Siva Prasad, S. Tripathi, and S. Das, “Tightly Coupled MIMO With Internal Self-Decoupled E-Shaped Design Arms for 5G Mobile Hand-Set,” <i>Microwave and Optical Technology Letters</i> 67, no. 1 (January 2025): e70089, https://doi.org/10.1002/mop.70089.</p><p>In the list of authors' names below the article title, the author name “D Venkata Shivaprasad” is incorrect. The author's name should be “D Venkata Siva Prasad.”</p><p>We apologize for this error.</p>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mop.70123","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143112039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predicting Power Density for Mm-Wave Handset Antennas Based on Machine Learning","authors":"Hui Li,&nbsp;Chang Qu,&nbsp;Jiapeng Zhang,&nbsp;Tian-Xi Feng","doi":"10.1002/mop.70116","DOIUrl":"https://doi.org/10.1002/mop.70116","url":null,"abstract":"<div>\u0000 \u0000 <p>Simulating the peak spatial-average incident power density (PD) for 5G millimeter-wave (mm-wave) handset antenna arrays is important but time-consuming, as the entire handset needs to be taken into account. In this letter, a time-efficient method based on machine learning (ML) is proposed to predict the maximum PD of mm-wave antennas in real handsets. By training various typical antenna arrays, a mapping relationship is established between the near-field distributions of the antenna array in real handsets and those of the stand-alone array. With this mapping, the maximum PD of any mm-wave array in a real handset can be quickly predicted by simulating the PD of the corresponding stand-alone array. The method has been verified on several 4 × 1 arrays commonly used in 5G mobile handsets, showing accurate prediction of the maximum PD. The proposed method can be applied to mm-wave arrays of any type and significantly reduces the evaluation time.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143110876","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}