Microwave and Optical Technology Letters最新文献

{"title":"Gain-Enhanced and Size Reduction Endfire Periodic Antenna Array With Multiple DSPSL-Based Loop Resonant Element","authors":"Zhe Wu,&nbsp;Yu Yun,&nbsp;NengWu Liu,&nbsp;Agostino Monorchio,&nbsp;Lingkun Ma,&nbsp;Tao Tao,&nbsp;Tao Wu,&nbsp;Ruiqi Wang,&nbsp;Ling Sun,&nbsp;Yindi Wang","doi":"10.1002/mop.70285","DOIUrl":"https://doi.org/10.1002/mop.70285","url":null,"abstract":"<div>\u0000 \u0000 <p>A compact high-gain endfire loop antenna array based on a double-sided parallel stripline (DSPSL) structure is proposed in this letter. The proposed design achieves radiation mode transformation by deforming the DSPSL into two half-loops positioned on opposite sides of the substrate. A single feed port is employed, while the other port is terminated with a metal pin for impedance matching. By integrating a parasitic circular patch within the loop structure, the design effectively suppresses sidelobes and significantly enhances directionality. Furthermore, the endfire gain is further improved by incorporating a reflector behind the first radiating element. A prototype was fabricated and measured, demonstrating excellent agreement between simulated and experimental results. The measured peak gain reaches 13.57 dBi within the operating bandwidth, while maintaining a compact overall volume of only 0.19<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msubsup>\u0000 <mi>λ</mi>\u0000 \u0000 <mn>0</mn>\u0000 \u0000 <mn>3</mn>\u0000 </msubsup>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${lambda }_{0}^{3}$</annotation>\u0000 </semantics></math>.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144573375","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 Design Technique for Ultrawideband Shared Aperture Connected Dipole Arrays","authors":"Kaan Arda,&nbsp;Gülbin Dural","doi":"10.1002/mop.70294","DOIUrl":"https://doi.org/10.1002/mop.70294","url":null,"abstract":"&lt;p&gt;This paper presents comprehensive circuit models for the design and analysis of ultrawideband shared aperture antenna arrays. A novel semi-analytical approach is developed by modifying the previous equivalent circuit model to enable the calculation of the electromagnetic (EM) transparency of dipole array unit cells. Based on the EM transmission characteristics of the low-band dipole, an accurate circuit-based method is introduced for calculating the input impedance of a shared aperture antenna. Notably, the only full-wave simulation required is that of the standalone high-band antenna. To demonstrate the effectiveness of the proposed technique, two distinct shared aperture dipole array designs are presented. In both cases, the high-band antennas are implemented using tightly coupled dipole array (TCDA) elements. The first design achieves a 26.2:1 impedance bandwidth with active VSWR &lt; 2.3 and a low-profile height of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 \u0000 &lt;mo&gt;.&lt;/mo&gt;\u0000 \u0000 &lt;mn&gt;088&lt;/mn&gt;\u0000 \u0000 &lt;msub&gt;\u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 \u0000 &lt;mi&gt;L&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${bf{0}}.{bf{088}}{{boldsymbol{lambda }}}_{{boldsymbol{L}}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, where &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 \u0000 &lt;mi&gt;L&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${{boldsymbol{lambda }}}_{{boldsymbol{L}}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; denotes the free-space wavelength at the lowest operating frequency. The second design achieves a 33.3:1 bandwidth with active VSWR &lt; 3 and a profile height of just &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 \u0000 &lt;mo&gt;.&lt;/mo&gt;\u0000 \u0000 &lt;mn&gt;07&lt;/mn&gt;\u0000 \u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 \u0000 &lt;mi&gt;L&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${{bf{0}}.{bf{07}}{boldsymbol{lambda }}}_{{boldsymbol{L}}}$&lt;/annotation&gt;\u0000 &lt;/se","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mop.70294","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144550844","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":"Supermode Coupling Analysis in FM-MCF With Core Group Layout Variation","authors":"Mercy Kingsta Ravindran,&nbsp;Shantha Selvakumari Ramapackiyam","doi":"10.1002/mop.70293","DOIUrl":"https://doi.org/10.1002/mop.70293","url":null,"abstract":"<div>\u0000 \u0000 <p>The design of trench assisted heterogeneous uncoupled-coupled group few mode multi-core fiber which is capable of supporting fundamental supermodes as well as higher order supermodes is presented in this paper. The coupling characteristics of modes in the proposed fiber design are analyzed with selective mode excitation and the supermode coupling behavior in relation to the group pitch and trench region is studied for fundamental degenerate supermodes. The obtained results for mode confinement and effective mode area indicate the importance of the selective mode launch technique for multi-core fiber. The characteristics of supermode coupling with orientation change in the core group layout is also analyzed in this paper for 3 core and 4 core uncoupled-coupled group few mode multi-core fiber. The obtained results reveal that it is necessary to identify proper core group orientation besides the need for optimisation of design of cores, cladding and trench regions.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144550843","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":"High Scanning Rate Leaky-Wave Antenna Using Mixed Cross-Coupling Sections","authors":"Shen-Da Xu,&nbsp;Guochen Ni,&nbsp;Dong-Fang Guan","doi":"10.1002/mop.70291","DOIUrl":"https://doi.org/10.1002/mop.70291","url":null,"abstract":"<div>\u0000 \u0000 <p>A high scanning rate microstrip leaky-wave antenna (LWA) cascaded by 10 mixed cross-coupling sections is proposed, the section contains three resonant patches. We improve the beam scanning rate with the group delay theory, which are the key issues in the study of LWAs. Through theoretical analysis and simulation verification, the antenna parameters are optimized. The designed antenna has been fabricated and measured, and the simulated and measured results are in good agreement. A high scanning rate of 10.7 is achieved with a almost symmetry beam scanning range from −38° to 36°. Besides, the relative bandwidth of the fabricated antenna is reduced to only 6.9%.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537058","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":"Multichannel Temperature Sensor Based on Fiber Bragg Grating Combined With Fiber-Cavity Ring-Down Technique","authors":"Keiji Kuroda","doi":"10.1002/mop.70297","DOIUrl":"https://doi.org/10.1002/mop.70297","url":null,"abstract":"<div>\u0000 \u0000 <p>A multichannel fiber Bragg grating (FBG) temperature sensor based on use of the fiber ring-down technique is reported. A quasi-linear fiber-optic cavity consisting of the FBG is used to perform the ring-down measurement. Ring-down signals acquired from two fiber cavities connected in series are combined simultaneously with a reference field to obtain heterodyne beat signals. Use of this heterodyne detection technique allows the sensor to perform highly sensitive and accurate temperature measurements. The sensor achieves a temperature resolution of 0.014°C.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144524694","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 and Broadband Elliptical Antenna With Metallic Walls for Low Cross-Polarization","authors":"Rinkee Chopra","doi":"10.1002/mop.70289","DOIUrl":"https://doi.org/10.1002/mop.70289","url":null,"abstract":"<div>\u0000 \u0000 <p>A multilayer compact and broadband elliptical microstrip antenna (MSA) is designed with low cross-polarization using shorting posts and metallic walls. Two dumbbell-shaped patches are stacked on top of a metallic elliptical fed patch. These patches are printed on an air-suspended FR-4 substrate in the area utilized by the elliptical patch. The dumbbell-shaped patches are directly coupled with the elliptical patch by embedding shorting pins between them at symmetrical positions which improve the bandwidth (BW) and cross polarization (X-pol). The antenna geometry is further enclosed in metallic walls to improve gain and to reduce X-pol and front-to-back ratio (FBR). A systematic study of the antenna design is presented. The designed multilayer elliptical MSA is a low-cost antenna with size 0.85<i>λ</i> × 0.58<i>λ</i> × 0.15<i>λ</i> and provides 43.8% BW (1.619–2.526 GHz) with peak gain of 9 dBi and FBR of more than 16 dB over BW. The antenna X-pol is below −20 dB from 1.7 to 2.52 GHz. The designed antenna can be used for IoT-based smart devices and 5G cellular services in sub-6 GHz frequency band.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519632","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":"UHF RFID Near-Field Electric Antenna Based on ES-CRLH Transmission Line","authors":"Jun Zhang,&nbsp;Zhichao Zeng,&nbsp;Xuan Xie,&nbsp;Bei Huang","doi":"10.1002/mop.70286","DOIUrl":"https://doi.org/10.1002/mop.70286","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, a novel ultra high frequency (UHF) radio-frequency identification (RFID) near-field reader antenna is proposed. Based on an edge-coupled spiral composite right/left-handed transmission line (ES-CRLH-TL), the antenna aims to address the misreading of tightly-placed adjacent tags in roll-to-roll fabrication, which is a common challenge for RFID printers during the customization process of RFID tags. The proposed ES-CRLH cell can concentrate and enhance the tangential electric field EY (the direction of primary polarization) by incorporating interdigital capacitors and edge-spiral line structures, while the series cell achieves a uniform longitudinal distribution. The traveling wave transmission line facilitated by the CRLH structure ensures that the reflection coefficient S11 remains below −15 dB across the entire UHF frequency band (860-960 MHz). The feasibility of the proposed design is verified through simulation and measurement of a 5-cell series antenna. The antenna can effectively discriminate tags that are in close proximity, requiring a minimum activation power for the tag of less than 0 dBm and a separation of only 5 mm between adjacent tags. The proposed antenna exhibits high coupling efficiency and spatial selectivity, rendering it suitable for printer applications with tags in worldwide bands.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144482177","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":"Properties in the Barrier-Type He+-Implanted Dy:Lu2Si2O7 Waveguide","authors":"Bin Yang,&nbsp;Ya-Nan Miao,&nbsp;Ze-Ang Li,&nbsp;Hao-Zhe Chen,&nbsp;Jia-Pei Wu,&nbsp;Jie Zhao,&nbsp;Chun-Xiao Liu,&nbsp;Liao-Lin Zhang","doi":"10.1002/mop.70290","DOIUrl":"https://doi.org/10.1002/mop.70290","url":null,"abstract":"<div>\u0000 \u0000 <p>Dy:Lu₂Si₂O₇ has great potential in applications for optical devices and systems. This study reports on the formation of planar waveguides on the Dy:Lu₂Si₂O₇ crystal through helium ion implantation. The energy and dose of the He⁺-ion implantation are 400 keV and 6 × 10¹⁶ions/cm², respectively. The energy loss distribution caused by the irradiation in the Dy:Lu₂Si₂O₇ was calculated using SRIM 2013 to investigate the physical mechanism of waveguide formation. The optical microscope image of the waveguide cross-section was captured using a Nikon microscope. The prism coupler was used to record the spectrum of propagating modes from which the refractive index of the waveguide could be obtained based on the reflective calculation method. The guiding properties of light in the waveguide were studied using an end-fire coupling system. The results, including the core refractive index of 1.7477 and the propagation loss of 2.2 dB/cm at 632.8 nm, have potential applications in the development of optical waveguide devices.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144473229","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 Linear Connected Printed Inverted-F Antenna Array for 5G mm-Wave MIMO Applications","authors":"Muhammad Ikram,&nbsp;Hajra Khan","doi":"10.1002/mop.70283","DOIUrl":"https://doi.org/10.1002/mop.70283","url":null,"abstract":"<p>In this study, a linear connected printed inverted-F antenna (PIFA) array (LCPA) configured for a multiple-input multiple-output (MIMO) system is presented for use in 5G mm-wave applications. The design is compared with conventional antenna arrays to highlight the advantages of the proposed approach. Specifically, the proposed system consists of a four-element MIMO antenna array, where each element incorporates eight individual PIFAs, collectively forming a linear connected printed inverted-F antenna (LCPA) structure. To facilitate excitation of each LCPA, a tapered T-junction 1 × 8 power divider/combiner is employed. The LCPA is specifically designed to operate at a frequency of 28 GHz, suitable for high-frequency 5 G commu- nication. Experimental measurements show that the impedance matching bandwidth of the antenna spans 1 GHz, from 27.5 to 28.5 GHz, with a −10 dB return loss, indicating effective resonance within this frequency range. The entire antenna array is fabricated on a substrate material, R0-4350B, with a total size of 130 mm by 68 mm and a thickness of 0.76 mm. This compact design, being single-layered and simple in its structural layout, makes it ideal for integration into mobile handheld devices, where space is a critical constraint. Overall, the proposed design offers a high-performance, efficient solution for MIMO antenna systems in 5G mobile communication applications.</p>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mop.70283","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144473181","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":"A Petal-Shaped Four-Port MIMO Antenna for 5G Mobile Communications","authors":"Yuteng Wu,&nbsp;Aiting Wu,&nbsp;Zhihua Fang,&nbsp;Zhonghai Zhang,&nbsp;Pengquan Zhang","doi":"10.1002/mop.70284","DOIUrl":"https://doi.org/10.1002/mop.70284","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, a low-profile, structurally simple, and highly isolated petal-shaped four-port multiple-input multiple-output (MIMO) antenna module is proposed. The antenna comprises a central circular patch surrounded by four truncated circular patches. Impedance matching and isolation are optimized using straightforward grounding pins. The compact design measures only 38 × 38 × 1.6 mm³ and exhibits a − 6 dB impedance bandwidth ranging from 4.4 to 5.47 GHz, covering the 5th Generation (5G) N79 band (4.4–5 GHz). It achieves an isolation better than 20 dB, a gain of 3.4–3.85 dBi, and an efficiency of 54%–72%. Measurement results are consistent with simulations. The proposed antenna features miniaturization, structural simplicity, and high isolation, providing a feasible solution for 5G mobile MIMO antennas on the back covers of mobile devices.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144473228","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}