Frequenz最新文献_第2页

Bidirectional triple-band truly incident angle insensitive polarization converter using graphene-based transmissive metasurface for terahertz frequency 使用石墨烯基透射元表面的双向三波段真正入射角不敏感极化转换器，用于太赫兹频率

IF 1.1 4区工程技术

Frequenz Pub Date : 2024-07-22 DOI: 10.1515/freq-2024-0065

Hiranmay Mistri, Anumoy Ghosh, Manaj Dandapathak

{"title":"Bidirectional triple-band truly incident angle insensitive polarization converter using graphene-based transmissive metasurface for terahertz frequency","authors":"Hiranmay Mistri, Anumoy Ghosh, Manaj Dandapathak","doi":"10.1515/freq-2024-0065","DOIUrl":"https://doi.org/10.1515/freq-2024-0065","url":null,"abstract":"The design and response of a triple-band linear-to-circular polarization converter (LTCPC) in the terahertz frequency regime using a graphene-based transmission-type metasurface have been studied numerically and analytically. The unit cell of the converter is constructed using lossy silicon dioxide (SiO2) with a relative permittivity of 3.9 as the substrate. And two similar layers of graphene-based sub-wavelength structures are used at the top and bottom of it. Multiband linear to circular polarization conversion is achieved from 0.74 THz to 0.98 THz, 1.70 THz to 2.33 THz, and 4.06 THz to 5.19 THz, i.e., about 28 %, 31 %, and 24 % fractional bandwidths, respectively. As the same metasurface configuration is used at the top and bottom layers of the transmission-type unit cell, it can be used as a bidirectional polarization converter with identical responses from both sides. The geometrical optimization of the unit cell is done, and an equivalent lumped parameter circuit model is also proposed for the same, considering analogous responses. Tunability over the operating frequency is achieved by varying the chemical potential and relaxation time of graphene. Moreover, due to the ultrathin width and special types of identical configuration of the metasurfaces, the response of the system remains excellent over a wide range of incident angle variations up to 80° angle of incidence.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"72 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141742040","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 of spiral antenna for enhancing antenna-plasma coupling impedance for SST-1 tokamak 用于增强 SST-1 托卡马克天线与等离子体耦合阻抗的螺旋天线分析

IF 1.1 4区工程技术

Frequenz Pub Date : 2024-07-22 DOI: 10.1515/freq-2023-0433

Dimple Yadav, Vishant Gahlaut, Meenu Kaushik, Raj Singh

引用次数: 0

Dual band beam steering antenna using branch line coupler network for higher band applications 使用支线耦合器网络的双波束转向天线，适用于更高频段应用

IF 1.1 4区工程技术

Frequenz Pub Date : 2024-07-18 DOI: 10.1515/freq-2024-0078

Amit Abhishek, Priyadarshi Suraj

{"title":"Dual band beam steering antenna using branch line coupler network for higher band applications","authors":"Amit Abhishek, Priyadarshi Suraj","doi":"10.1515/freq-2024-0078","DOIUrl":"https://doi.org/10.1515/freq-2024-0078","url":null,"abstract":"A beam-steering fed array antenna has been proposed for radar and mm-Wave applications operating from 22.6 to 26.89 GHz and 30–45 GHz with B.W % of 17.34 % and 40 % respectively having size of 12.11 × 25.58 × 0.8 mm3 (0.96λo × 2.01λo × 0.06λo). For radar, this antenna covers 24.15 GHz as police radar, 24.25–25.25 GHz & 31.8–33.4 GHz as navigation radar, and 33.4–36 GHz as high-resolution radar for airport surveillance. This antenna also covers mm-wave bands for different countries (Brazil-40 GHz, China- 34–42.5 GHz, Mexico- 33 GHz and 37 GHz, and USA- 24 GHz, 37 & 39 GHz). At initial stage, a monopole antenna with DGS has been designed with an operating band of 20.2–31.2 GHz and 36.6–42.2 GHz. Proposed antenna shifts the beam pattern at 90° with each other after exciting each port in alternative order with a scanning angle of ±45°, ±75° & ±180°. Peak gain for 1st band ranges from 7.1 to 9 dBi and for the 2nd band ranges from 8.8 to 10.2 dBi and has a radiation efficiency of 88 %. Other diversity parameters such as ECC, DG, MEG, and isolation get analysed to observe the coupling effects. Design, development, and analysis of all antenna parameters is done by using HFSS 19 platform.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141742039","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 high gain miniaturized WPT rectenna for implantable biomedical applications 设计用于植入式生物医学应用的高增益小型化 WPT 整型天线

IF 1.1 4区工程技术

Frequenz Pub Date : 2024-06-22 DOI: 10.1515/freq-2023-0354

Rajendra Jampa, Dinesh Sharma

{"title":"Design of high gain miniaturized WPT rectenna for implantable biomedical applications","authors":"Rajendra Jampa, Dinesh Sharma","doi":"10.1515/freq-2023-0354","DOIUrl":"https://doi.org/10.1515/freq-2023-0354","url":null,"abstract":"Implantable medical devices (IMDs) have become indispensable for treating various health disorders and monitoring individual well-being as a result of significant technical breakthroughs in the field of biomedical technology. This article describes a wireless powering technique at 2.45 GHz for low power devices such as IMDs. The design incorporates a rectangular patch antenna that exhibits peak gain of 2.1 dB and impedance bandwidth of 620 MHz with compact size of 71.4 mm3. The antenna is simulated within a three-layer phantom model replicating the human body to evaluate its performance, which produces −21.4 dB peak gain and 600 MHz–10 dB impedance bandwidth. A full wave rectifier aided by matching network is used to accomplish optimal conversion of RF signal to DC power. The constructed prototype is tested in a saline solution, and the measured results closely match the simulation results. Specific Absorption Rate (SAR) is calculated using a phantom model and a head model for assessing patient safety and biocompatibility. The proposed antenna has SAR values of 5.12 W/kg and 3.13 W/kg are exhibited by proposed antenna inside three layer phantom model and human head model.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"44 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141508363","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 super-compact wideband bandpass filter using capacitor-loaded coupled lines 使用电容耦合线的超紧凑型宽带带通滤波器

IF 1.1 4区工程技术

Frequenz Pub Date : 2024-05-13 DOI: 10.1515/freq-2024-0055

Kai-Da Xu, Jing Tian, Hairui Liu, Yannan Jiang

引用次数: 0

An optimal concentric circular antenna array design using atomic orbital search for communication systems 利用原子轨道搜索进行通信系统同心圆天线阵列优化设计

IF 1.1 4区工程技术

Frequenz Pub Date : 2024-05-03 DOI: 10.1515/freq-2023-0432

Ali Durmus, Zafer Yildirim, Rifat Kurban, Ercan Karakose

{"title":"An optimal concentric circular antenna array design using atomic orbital search for communication systems","authors":"Ali Durmus, Zafer Yildirim, Rifat Kurban, Ercan Karakose","doi":"10.1515/freq-2023-0432","DOIUrl":"https://doi.org/10.1515/freq-2023-0432","url":null,"abstract":"In this study, optimum radiation patterns of Concentric Circular Antenna Arrays (CCAAs) are obtained by using the Atomic Orbital Search (AOS) algorithm for communication spectrum. Communication systems stands as a nascent technological innovation poised to revolutionize the landscape of wireless communication systems. It distinguishes itself through its hallmark features, notably an exceptionally high data transmission rate, expanded network capacity, minimal latency, and a commendable quality of service. The most important issue in wireless communication is a precision antenna array design. The success of this design depends on suppressing the maximum sidelobe levels (MSLs) values of the antenna in the far-field radiation region as much as possible. The AOS, which is a rapid and flexible search algorithm, is a novel physics-based algorithm. The amplitudes and inter-element spacing of CCAAs are optimally determined by utilizing AOS to the reduction of the MSLs. In this study, CCAAs with three and four rings are considered. The number of elements of these CCAAs has been determined as 4–6–8, 8–10–12 and 6–12–18–24. The radiation patterns obtained with AOS are compared with the results available in the literature and it is seen that the results of the AOS method are better.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"52 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140841626","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 new technique for improving performance of conventional CRLH resonators using IDC/UISs with enhanced harmonic suppression in balanced dual-band BPFs 在平衡双频 BPF 中使用 IDC/UIS 提高传统 CRLH 谐振器性能并增强谐波抑制的新技术

IF 1.1 4区工程技术

Frequenz Pub Date : 2024-04-12 DOI: 10.1515/freq-2023-0409

Reza Eskandari, Mohammadbagher Tavakoli, Farbod Setoudeh, Ashkan Horri, Seyed Peyman Faghir Mirnezami

{"title":"A new technique for improving performance of conventional CRLH resonators using IDC/UISs with enhanced harmonic suppression in balanced dual-band BPFs","authors":"Reza Eskandari, Mohammadbagher Tavakoli, Farbod Setoudeh, Ashkan Horri, Seyed Peyman Faghir Mirnezami","doi":"10.1515/freq-2023-0409","DOIUrl":"https://doi.org/10.1515/freq-2023-0409","url":null,"abstract":"The design of balanced filters based on composite right/left hand (CRLH) structure is well developed. Among those, few designs exist which although they provide some good responses, suffer from narrow stopbands and interdependent passbands. This paper proposes a new technique for improving the characteristics of dual-band balanced bandpass filters (B-BPFs) based on planar CRLH. Using unequal inductive stubs (UISs) attached to the interdigital capacitor (IDC) unit cell, we were able to achieve outstanding harmonic suppression and passband controllability. This structure offers higher degrees of freedom compared to conventional designs and provides better control over the filter specifications. Mathematical modeling, analysis, simulation, fabrication, and performance measurement of the proposed technique in a dual-band B-BPF are also provided. Our work resulted in an independent and controllable dual-band B-BPF with ultra-wide upper differential-mode (DM) stopband of 5.9f 1 and common-mode (CM) suppression of 40.4 and 32.6 dB for the first and second bands, respectively.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"18 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140565820","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 of muscle implanted antenna performance with the variation of implantation depth 随植入深度变化的肌肉植入天线性能分析

IF 1.1 4区工程技术

Frequenz Pub Date : 2024-04-12 DOI: 10.1515/freq-2023-0421

Soham Ghosh, Bhaskar Gupta

引用次数: 0

A high-selectivity ceramic bandpass filter with controllable transmission zeros 具有可控传输零点的高选择性陶瓷带通滤波器

IF 1.1 4区工程技术

Frequenz Pub Date : 2024-03-28 DOI: 10.1515/freq-2023-0198

Yingxuan Fang, Mengxia Yu, Xiaochuan Zhang, Rou Zhang, Jing Ma

引用次数: 0

Design and analysis of four leaf clover shaped MIMO antenna for Sub-6 GHz V2X applications 设计和分析用于 6GHz 以下 V2X 应用的四叶草形 MIMO 天线

IF 1.1 4区工程技术

Frequenz Pub Date : 2024-03-28 DOI: 10.1515/freq-2023-0076

Purnima K. Sharma, Jerzy R. Szymański, Marta Żurek-Mortka, Mithileysh Sathiyanarayanan, Dinesh Sharma

{"title":"Design and analysis of four leaf clover shaped MIMO antenna for Sub-6 GHz V2X applications","authors":"Purnima K. Sharma, Jerzy R. Szymański, Marta Żurek-Mortka, Mithileysh Sathiyanarayanan, Dinesh Sharma","doi":"10.1515/freq-2023-0076","DOIUrl":"https://doi.org/10.1515/freq-2023-0076","url":null,"abstract":"A wide variety of driver safety, comfort, and infotainment systems are available in modern cars, many of which rely on wireless connectivity. This article introduces a modified square-shape MIMO antenna designed for vehicle-to-everything (V2X) communications. The design of the antenna operates for WiMAX, WirelssLAN, frequency bands which possess a compact size of 60 mm × 40 mm × 0.256 mm. The antenna utilizes modified square shape stubs and defected ground and achieves dual-band resonance by using circular shapes at the corners and a slot in the center position. The rectangular and circular slots enable resonance at 4.3 GHz & 5 GHz, and also has a low impedance matching with better radiation of omnidirectional patterns. It was determined that the MIMO antenna under consideration reaches a maximum gain of 6.5 dB and 4 dBi at 4.3 GHz and 5 GHz, respectively. When tested at theta = 30° and phi = 90°, this MIMO antenna shows very little backward radiation, exactly −5 dB. The authors have attained reliable communication by fine-tuning the structural parameters of the antenna to achieve the desired passband performance. Furthermore, virtually placing the antenna on a car model and analyzing its performance in a realistic scenario has enabled them to determine the antenna’s effectiveness in real-world applications. The authors have also presented better simulation results. This approach provides experimental evidence of the antenna’s performance and validates the results, ensuring the proposed antenna meets the required specifications. The article provides a robust analysis of proposed design of the antenna for vehicular communications.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"28 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140324742","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