International Journal of RF and Microwave Computer-Aided Engineering最新文献

{"title":"Exploiting Rössler Chaos for the Development of Advanced High-Efficiency Broadband Microwave Absorbers in Modern Microwave Applications","authors":"Mertcan Oral,&nbsp;Oguzhan Akgol,&nbsp;Fikret Alpay Teksen,&nbsp;Berker Colak,&nbsp;Fatih Ozkan Alkurt,&nbsp;Mehmet Bakir,&nbsp;Ahmet Sertol Koksal,&nbsp;Arlet Patricia Franco,&nbsp;Muharrem Karaaslan","doi":"10.1155/mmce/5510278","DOIUrl":"https://doi.org/10.1155/mmce/5510278","url":null,"abstract":"<p>This research explores the utilization of the Rössler chaotic attractor in designing a broadband electromagnetic absorber with superior performance across the 2–20-GHz frequency range. The study commences with an in-depth exploration of the parameters governing the Rössler chaotic system, culminating in the generation of intricate three-dimensional spatial representations. Given the standardized thickness of 0.035 mm for the <i>z</i>-axis in the absorber structure, these three-dimensional models were carefully processed through iterative algorithms using Julia Fractal transformations. This process facilitated the derivation of two-dimensional chaotic patterns, which were subsequently subjected to rigorous simulations to evaluate their electromagnetic absorption properties. In the proposed absorber design, the chaotic patterns were developed using a resistive ink with an accurate thickness of 0.035 mm, integrated with an FR-4 substrate. To maximize absorption efficiency, the absorber backplane was coated with copper at a standardized thickness of 0.035 mm. A comprehensive parametric analysis was conducted to examine the influence of critical design factors, including substrate thickness, absorber dimensions, and polarization modes across varying incident angles, on the absorption characteristics. The findings emphasize the unique capabilities of the Rössler chaotic patterned absorber, unveiling its exceptional potential for deployment in a range of contemporary applications. Significantly, this study signifies a pioneering endeavor in applying the Rössler chaotic methodology to the design and optimization of metamaterial absorbers. This contribution not only strengthens the theoretical understanding of chaotic systems in electromagnetic applications but also establishes a novel framework for future advancements in the field.</p>","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2026 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/5510278","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147714881","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 130-nm SiGe BiCMOS On-Chip Diplexer With High- Inductors for K/Ka-Band Applications","authors":"Francesco Greco,&nbsp;Emilio Arnieri,&nbsp;Melih Gokdemir,&nbsp;Mohammed Alramadan,&nbsp;Giandomenico Amendola,&nbsp;Walter Ciccognani,&nbsp;Ernesto Limiti,&nbsp;Hussein Ezzeddine,&nbsp;Enrico Massoni,&nbsp;Luigi Boccia","doi":"10.1155/mmce/3361218","DOIUrl":"https://doi.org/10.1155/mmce/3361218","url":null,"abstract":"<p>This paper presents a high-performance on-chip diplexer designed for K/Ka-band applications, fabricated via 130-nm SiGe BiCMOS across two distinct frequency bands: 17–21 and 27–31 GHz. A localized backside etching (LBE) technique is employed to create air cavities beneath the inductors, a method that fundamentally mitigates substrate-related losses and significantly enhances the inductor quality (<i>Q</i>) factor. The diplexer, based on a compact low-pass/high-pass filter topology, achieves low insertion loss and high interband isolation. Measured results demonstrate insertion losses of 2.2 and 2.4 dB for the low band and high band, respectively, and an isolation greater than 40 dB. This experimental validation proves the effectiveness of the LBE technique for realizing compact, high-performance RF front-end components in silicon-based technologies.</p>","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2026 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/3361218","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147615441","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":"Micro-Fabricated THz Antenna for Short-Range Wireless Communication","authors":"Muhammad Zubair,&nbsp;Abdoalbaset Abohmra,&nbsp;Adnan Zahid,&nbsp;Farooq A. Tahir,&nbsp;Muhammad Imran,&nbsp;Kamran Arshad,&nbsp;Khaled Assaleh,&nbsp;Bo Liu,&nbsp;Qammer H. Abbasi","doi":"10.1155/mmce/4182699","DOIUrl":"https://doi.org/10.1155/mmce/4182699","url":null,"abstract":"<p>In the rapidly evolving field of terahertz (THz) communications, the design and fabrication of efficient antennas pose significant challenges due to the inherent complexities of operating at such high frequencies. This paper presents a microfabricated THz antenna array featuring triangular-slot patches designed to enhance bandwidth, gain, and efficiency at THz frequencies from 0.70 to 0.95 THz. The design involves utilizing a coplanar waveguide (CPW) feed technique to simplify the microfabrication process, improving antenna integration by enhancing impedance matching and reducing transmission losses. To optimize the antenna geometry, a machine learning (ML)–assisted global optimization method, specifically the surrogate-assisted differential evolution algorithm, is used to improve bandwidth, gain, and tolerance to fabrication variations. The prototype is fabricated on a flexible polyimide substrate using electron beam lithography, with a titanium/gold (Ti/Au) metallization stack of 10/350 nm. The proposed design achieves a simulated impedance bandwidth of 37.5% (from 0.70 to 0.95 THz), a simulated radiation efficiency of 85%, and a simulated gain of 8.71 dBi, making it a potential candidate for short-range wireless communication applications. Owing to the unavailability of in-house measurement facilities at THz frequencies, the experimental validation could not be performed at this stage; however, the design process is supported by full-wave electromagnetic simulation along with an extensive optimization of every parameter using ML-enabled optimization, which are established as reliable and effective methods for antenna design and performance prediction. These results highlight its potential for compact, high data rate short-range THz systems.</p>","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2026 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/4182699","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147568053","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 Dual-Band Patch Antenna for Skin Implant Applications: Design, Optimization, and Performance Evaluation","authors":"Emtiaz Ahmed Mainul,&nbsp;Md Faruque Hossain","doi":"10.1155/mmce/5559895","DOIUrl":"https://doi.org/10.1155/mmce/5559895","url":null,"abstract":"<p>This work presents a compact dual-band patch antenna designed for skin implant applications. The antenna features a robot-shaped patch structure on FR-4 substrate and resonates at dual bands of 915 and 2430 MHz. Three techniques are employed to miniaturize the antenna: a shorting pin between the patch and ground, defected ground structure (DGS), and utilization of tissue electrical properties. Thus, the optimized antenna volume is found to be 8 × 12 × 1.36 mm³, with near-perfect impedance matching. The antenna also achieves enhanced impedance bandwidths of 15.74% and 15.64% and gains of −29 and −16.6 dBi at 915 and 2430 MHz, respectively. Its specific absorption rates (SARs) are found to be acceptable, with values of 448 and 221 W/kg in the 1 g tissue standard at the respective bands. Furthermore, the antenna can communicate with the receiver antenna at a high data rate of 1 Mbps over 8–12 m, where the distance can be extended to 25–40 m by choosing a low data rate of 100 Kbps. The antenna is measured for its return loss ex vivo using chicken tissue, which is found to be in close agreement with the simulation results. Thus, the balanced performance in terms of compact size, large bandwidth, and comparable gain and SAR makes the proposed antenna a promising candidate for practical applications.</p>","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2026 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/5559895","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147567334","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":"Heat Load Investigation of Collector for High-Average Power Beam Dump of 80 MW Klystron for CEPC LINAC","authors":"Munawar Iqbal,&nbsp;Zusheng Zhou,&nbsp;Ouzheng Xiao,&nbsp;Noman Habib,&nbsp;Abid Aleem,&nbsp;Yu Liu,&nbsp;YiAo Wang,&nbsp;Han Xiao,&nbsp;Abdul Wasy Zia","doi":"10.1155/mmce/8190912","DOIUrl":"https://doi.org/10.1155/mmce/8190912","url":null,"abstract":"<p>For the average output power of the C-band klystron for CEPC LINAC, the power capacity and stability of the collector are investigated. The characteristics of the electron collection, the modeling of the cooling system, and the suppression of the magnetic field are analyzed. The dissipated power is associated with the transverse energy of the electron beam guided by the applied magnetic field profile. We successfully terminated the magnetic field at the collector entrance to defocus the beam for a higher beam spread for lower heat load without using any extra reverse coil. The results indicate that the klystron, driven by a 425-kV, −416-A electron beam, <i>can withstand a maximum beam power of 177</i> MW <i>at zero RF drive.</i> Thermal results indicate, with a 0.03% duty factor, an average power of 52 kW in the collector, <i>a maximum temperature of</i> ? <i>88</i>°C <i>is measured on the collector with an optimized cooling system. The simulated and theoretical temperatures are in agreement.</i> The power capacity, cooling efficiency, and stability analysis of the collector are carried out in this article. The results establish the high-power capacity and integrity of the collector.</p>","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2026 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/8190912","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147566624","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":"High-Performance and Space-Qualified L-Band to Ka-Band Up-Converter Based on Hybrid Local-Oscillator Architecture","authors":"Dingzhan Yu,&nbsp;Yuanye Zhou,&nbsp;Qing Li,&nbsp;Boyang Chen,&nbsp;Ping Wen,&nbsp;Zhen Yu,&nbsp;Chenglong Feng,&nbsp;Yu Zhang","doi":"10.1155/mmce/8400501","DOIUrl":"https://doi.org/10.1155/mmce/8400501","url":null,"abstract":"<p>This paper proposes a high-reliability design for a space-qualified L-Ka (band) up-converter used in millimeter-wave communication systems. The design addresses key challenges related to phase noise, image rejection, output power, and environmental adaptability. It adopts a hybrid local-oscillator (LO) structure that combines a direct digital synthesizer (DDS), a phase-locked loop (PLL), and a frequency multiplier chain. Together with a double-balanced mixer, a cavity filter, and a cascade switch, the system achieves excellent phase-noise performance of −120 dBc/Hz@1 MHz and an image-rejection ratio of at least 75 dB. For reliability, the system follows the space-qualified processes and complies with the “six-property” criteria. Measures such as derating, cavity-based electromagnetic shielding, and thermally redundant power-supply design extend the mean time between failures (MTBF) to 21,739 h. A modular architecture and remote intelligent monitoring further enable on-orbit maintainability. Experimental and simulation results show that the proposed up-converter outperforms existing reference designs in gain-control accuracy, 1 dB compression point, spurious suppression, and other core metrics. Several performance indicators approach the international state of the art. This study provides an engineering-ready solution for high-reliability, space-qualified millimeter-wave equipment and contributes to improving system performance and autonomy in related applications.</p>","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2026 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/8400501","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147566170","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":"New Design Antenna and Optimization of S-Band Radar Networks Using CSRR Technology","authors":"Hamza Ben Hamadi,&nbsp;Said Riahi,&nbsp;Said Ghnimi,&nbsp;Ridha Ghayoula,&nbsp;Ali Gharsallah","doi":"10.1155/mmce/1005422","DOIUrl":"https://doi.org/10.1155/mmce/1005422","url":null,"abstract":"<p>In this paper, a new design and analysis of a highly compact metamaterial antenna array for radar applications operating in the S-band (2–4 GHz) is presented. To enhance the electrical and radiation characteristics of the proposed antenna, a slot was introduced into the radiating element, and a novel power divider was employed. The antenna structure incorporates a metamaterial complementary split-ring resonator (CSRR). The results show that at a resonant frequency of 2.55 GHz, the proposed antenna exhibits a reflection coefficient ranging from −32 to −10 dB. When the two-element array is assembled, the radiation gain increases to 6.4 dB, with an efficiency of 91.24%. Furthermore, the antenna array provides a complete 360° coverage, enabling omnidirectional and continuous scanning. This feature is crucial for radar applications, as it ensures optimal target detection throughout the entire radar perimeter, without blind spots or interruptions.</p>","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2026 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/1005422","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147565105","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":"Enhancing Vircator Efficiency Using Tapered Reflectors With Increasing Interreflector Distance","authors":"Khuban Lateef Khan,&nbsp;Chitaranjan Jadab,&nbsp;Romesh Chandra,&nbsp;Rishi Verma,&nbsp;Amitava Roy","doi":"10.1155/mmce/3650859","DOIUrl":"https://doi.org/10.1155/mmce/3650859","url":null,"abstract":"<p>The effectiveness of virtual cathode oscillator (Vircator) applications has been restricted due to the low efficiency in converting the electron beam to microwave. This research introduces the design of an axial Vircator that achieves higher power output by using reflectors in the drift area. The paper outlines the methodology for enhancing the reflector location, radii, and interreflector distances through the design process. While previous research works have been carried out on optimizing reflector radii and positioning, this work includes an optimization based on analytical expressions. This gives way to different placements of reflectors in which the “interreflector distance” increases with decreasing radii, which has not been studied before. The tapered radius and the increasing interreflector distance enhance the electrostatic focusing of the beam. The simulation findings, conducted using CST Microwave Studio, demonstrate that the average efficiency of the axial Vircator increases from 0.3% to 10.41%, and its average power output increases from 36.9 MW to 1.3 GW when five reflectors were added. The radius and distance between reflectors are increased as more reflectors are added in the drift region. The enhanced Vircator operates at a voltage of 511 kV and a peak current of approximately 24 kA, resulting in a dominant frequency of around 3.1 GHz. These findings indicate a notable improvement in Vircator performance, providing a route to enhance the efficiency of microwave device applications.</p>","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2026 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/3650859","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147563697","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 Metasurface Wave Splitter for Simplified Wireless Signal Reception","authors":"Hanchi Ruan,&nbsp;Haiyang Huang,&nbsp;Shiyao Hu,&nbsp;Yang Jiao,&nbsp;Wei Li","doi":"10.1155/mmce/4469237","DOIUrl":"https://doi.org/10.1155/mmce/4469237","url":null,"abstract":"<p>Next-generation wireless networks are expected to utilize limited radiofrequency (RF) resources more efficiently. Currently, the wireless communication systems require an extremely large number of RF chains and hence suffer from prohibitive complexity, hardware cost, and severe energy consumption. Tailoring the electromagnetic (EM) responses by metasurface greatly expands one′s capabilities to manipulate EM waves in a controlled manner. In this work, we developed a prototype of a metasurface-based EM wave splitter with the contribution from the corresponding receiving antenna array and the designed spectrum reconstruction algorithm to achieve the wireless signal reception in a simplified way. This approach enables instantaneous capture of both frequency-domain and time-domain signals from the incident carrier wave, allowing a single chain to effectively receive modulated EM waves across a broad frequency range. By eliminating the need for conventional complex analog or digital circuits for demodulation, this strategy is a potential technique in the development of next-generation wireless communication technologies.</p>","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2026 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/4469237","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147562438","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":"Compact Orthogonal UWB MIMO Antenna With Fractal-Slotted Design for Enhanced Isolation in 5G-NR and X-Band Applications","authors":"Killol Pandya,&nbsp;Trushit Upadhyaya,&nbsp;Aneri Pandya,&nbsp;Upesh Patel,&nbsp;Poonam Thanki,&nbsp;Kanwarpreet Kaur,&nbsp;Om Prakash Kumar","doi":"10.1155/mmce/9118129","DOIUrl":"https://doi.org/10.1155/mmce/9118129","url":null,"abstract":"<p>In this proposal, an advanced integrated multiple-input multiple-output (MIMO) antenna system has been presented for next generation 5G-NR, high speed WLAN and X-band communications. The four radiators having comb-shaped geometry at the top edge are positioned orthogonally with each other. An adequate gap is maintained between the radiating ports of MIMO antenna to lower down the mutual coupling. A small fractal geometry is engineered at the bottom corners of the patch to receive size miniaturization, wide band performance and manufacturing advantage. In similar fashion, thin slots are introduced to excel the isolation. The ultrawide band response (1.6 GHz–11.35 GHz) could be achieved by introducing partial ground plane underneath each radiator. A commercially available Flame Retardant 4 substrate was utilized. The individual ground structures are interconnected using thin conducting strips, which play a dynamic role in system performance by providing high isolation between the MIMO elements. The proposed MIMO system is analyzed and confirmed based on various antenna responses such as diversity gain (DG) (&gt;9 dB), mean effective gain (MEG) (−6 to −8 dB), channel capacity loss (CCL) (&lt; 0.4 bits/s/Hz), and envelop correlation coefficient (ECC) (&lt; 0.002 abs). The received reflection coefficient values from the MIMO antenna are compared with actual values. Both the responses are closely aligned with each other. This research supports SDG 9, SDG 11, and SDG 7 by advancing innovative wireless communication infrastructure, enabling sustainable and resilient smart city connectivity, and indirectly promoting energy-efficient network operations through high-isolation and efficient antenna design.</p>","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2026 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/9118129","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147315476","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}