Frequenz最新文献_第5页

CIQBCP-MIMO-DRA: CSRR inspired quad band circularly polarized MIMO-DRA for W-LAN, Wi-Max, Wi-Fi (6E) and X-band applications CIQBCP-MIMO-DRA：受 CSRR 启发的四频带圆极化 MIMO-DRA，适用于 W-LAN、Wi-Max、Wi-Fi (6E) 和 X 波段应用

IF 1.1 4区工程技术

Frequenz Pub Date : 2024-01-15 DOI: 10.1515/freq-2023-0281

Satyanarayan Rath, Sheeja Kochuthundil Lalitha

引用次数: 0

Shared-radiator design of broadband and dual-mode antenna for personal role radio applications 用于个人作用无线电应用的宽带双模天线共享辐射器设计

IF 1.1 4区工程技术

Frequenz Pub Date : 2024-01-15 DOI: 10.1515/freq-2023-0181

Guanjun Wang, Liang Zhu, Yayun Xie, Chao Lu

{"title":"Shared-radiator design of broadband and dual-mode antenna for personal role radio applications","authors":"Guanjun Wang, Liang Zhu, Yayun Xie, Chao Lu","doi":"10.1515/freq-2023-0181","DOIUrl":"https://doi.org/10.1515/freq-2023-0181","url":null,"abstract":"Abstract Shared-radiator design of a broadband and dual-mode antenna that simultaneously covers the VHF/UHF band and satellite navigation band is presented for personal role radio (PRR) applications. Quadrifilar helix antenna (QHA) is devised to be a circularly polarized radiator which as well acts as a part of the upper half radiation arm of the dipole antenna and be equivalent to a linearly polarized radiation current carrier at VHF/UHF band, forming a symmetrical dipole antenna with a sinusoidal current distribution. A 5th-order balanced matching network comprised of five cascade L-sections is adopted to obtain the maximum possible working band-width and a 3.76:1 band-width (116 %) at VHF/UHF band is achieved. Strong mutual coupling effect of the two operating modes is observed near 1.5 GHz originated from QHA shared-radiator design, and a new balun structure is applied to achieve high isolation and self-decoupling, subsequently |S21| of the two operating modes is significantly reduced from about −18 dB to below −32 dB at satellite navigation band without affecting the reflection coefficient and radiation efficiency. The measured results show that radiation patterns of the manufactured prototype is basically consistent with corresponding simulation counterparts.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"52 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139437259","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 5G Rotman beamforming lens antenna for higher beam angle and minimum phase error 分析 5G Rotman 波束成形透镜天线，以实现更高的波束角和最小的相位误差

IF 1.1 4区工程技术

Frequenz Pub Date : 2023-12-26 DOI: 10.1515/freq-2023-0239

Deep Kishore Parsediya, Pramod Kumar Singhal

{"title":"Analysis of 5G Rotman beamforming lens antenna for higher beam angle and minimum phase error","authors":"Deep Kishore Parsediya, Pramod Kumar Singhal","doi":"10.1515/freq-2023-0239","DOIUrl":"https://doi.org/10.1515/freq-2023-0239","url":null,"abstract":"Rotman lens beamforming networks are widely used for high gain, wide bandwidth applications in 5G communication. The uniform amplitude and phase distribution along with wide angle scanning at the array ports are mostly demanded for reducing the losses. Furthermore, minimum phase error is essential requirement for lens designs. Conventionally, for wide angle scanning, the lenses are designed by using most common expression between beam angle α and focal ratio (parameter ‘g’) i.e. g = 1 + 0.5α 2. The lenses obtained by such relation are inefficient for higher beam angle such as α = 45° due to the restricted shapes of beam and array contours. Hence suffer with large path length error limitation. In this paper, the mathematical relation between beam angle and focal ratio (parameter ‘g’) has been developed. The proposed relation offers phase error reduction more than 3× than the conventional expression based lens error. The simulation of the designed lens has performed using Software MATLAB which showed close agreement with the analytical values. Furthermore, three rectangular MPA arrays at center frequency 2.35 GHz have been proposed and simulated with lens design for 5G frequency range i.e. 2.3–2.4 GHz and offer high gain, directivity and wide coverage.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"113 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139057627","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

Sub-THz pyramidal horn antenna for 6G wireless communication 用于 6G 无线通信的次 THz 金字塔形喇叭天线

IF 1.1 4区工程技术

Frequenz Pub Date : 2023-12-25 DOI: 10.1515/freq-2023-0114

Sunil Kumar, Saurabh Kumar

引用次数: 0

An implantable ISM band antenna for biomedical application 用于生物医学应用的植入式 ISM 波段天线

IF 1.1 4区工程技术

Frequenz Pub Date : 2023-12-20 DOI: 10.1515/freq-2023-0207

Moumita Bose, Ashim Kumar Biswas, Abhishek Sarkhel, Aparna Kundu, Ujjal Chakraborty

{"title":"An implantable ISM band antenna for biomedical application","authors":"Moumita Bose, Ashim Kumar Biswas, Abhishek Sarkhel, Aparna Kundu, Ujjal Chakraborty","doi":"10.1515/freq-2023-0207","DOIUrl":"https://doi.org/10.1515/freq-2023-0207","url":null,"abstract":"This article presents a compact implantable antenna for biomedical use in the ISM band (2.4–2.48 GHz). The antenna is designed with Roger RT/duroid 6010.2LM high permittivity substrate of thickness 0.25 mm, and feed with a 50 Ω co-axial feed. A hybrid-loop resonator slot structure and C & I-shaped slots in the radiating patch has enabled the antenna to work in the ISM band. Via less ground makes this design simple, easier to fabricate, and a suitable candidate for implantable application. The proposed antenna occupies a small volume of 0.0984 λ 0 × 0.082 λ 0 × 0.00468 λ 0 and retained 152 MHz bandwidth (2.4077–2.5599 GHz with FBW 7.64 %) with a maximum gain of −22 dBi where λ 0 is guided wavelength. The projected antenna has good performance in the multi-layer tissue model, male human head voxel model, frequency-dependent skin model, and in muscle phantom by maintaining a minimum −20 dB return-loss in the ISM band. The proposed antenna’s Device Integration using a frequency-dependent skin phantom was performed and the results are well-suited for biomedical applications in the ISM band. The bare antenna was used to study the Specific Absorption Rate (SAR) in the human scalp. Where for 1 g and 10 g tissues the investigated results are 626.05 W/kg and 84.4 W/kg for an input power of 1 W, however the input power is limited to maximum 2.55 mW (for 1 g tissue) and 23.56 mW (for 10 g tissue) to comply with IEEE SAR guidelines. The qualities of the manufactured antenna are verified in a skin-imitating gel and animal tissue that exhibits good agreement with the simulation outcomes.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"41 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138826977","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

Wide angle metamaterial absorber for S, C and X band application 用于 S、C 和 X 波段的广角超材料吸收器

IF 1.1 4区工程技术

Frequenz Pub Date : 2023-11-24 DOI: 10.1515/freq-2022-0283

Pavan Kumar Shukla, Neelesh Kumar Gupta, Achyutanand Mishra, Sharmila, Apranjal Singh, Chetan Barde

{"title":"Wide angle metamaterial absorber for S, C and X band application","authors":"Pavan Kumar Shukla, Neelesh Kumar Gupta, Achyutanand Mishra, Sharmila, Apranjal Singh, Chetan Barde","doi":"10.1515/freq-2022-0283","DOIUrl":"https://doi.org/10.1515/freq-2022-0283","url":null,"abstract":"Abstract In this article, an angle independent Metamaterial Microwave Absorbers (MMA) is designed and demonstrated. The design consists of two concentric hexagon connected through consolidated resistors. The absorber is imprinted on a metal-backed low cost FR4 dielectric substrate with a thickness of 3.2 mm (λ/0.07) and a dielectric constant of 4.3. The proposed structure exhibits a wide absorption bandwidth ranging from 2.8 to 10.42 GHz with absorptivity above 90 % covering S, C and X Band. In the area of interest, the current and electric field distribution has been examined, for two maximum peaks at a frequency of 3.66 and 9.54 GHz, with maximum absorptivity of 99.99 % and 99.44 % respectively. The presented absorber is examined under different polarization angles for phi and theta variation. The fabricated sheet consists of an array of a unit cell, which is examined inside the anechoic chamber with the help of two horn antennas and VNA. The tested and simulated results are compared and it was found that they are almost similar to each other with little variation due to fabrication tolerance. The presented absorber can be practically used for defence applications for Radar Cross Sections (RCS) reduction.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"58 35","pages":"21 - 29"},"PeriodicalIF":1.1,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139239962","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

Direction independent broad-band wide angle metamaterial absorber for “K” band applications 用于“K”波段应用的方向无关的宽带宽角超材料吸收体

IF 1.1 4区工程技术

Frequenz Pub Date : 2023-11-17 DOI: 10.1515/freq-2023-0151

Laxmikant Dewangan, Megh Sainadh Patinavalasa, Juin Acharjee, Shrey Anant Sandiman, Saptarshi Ghosh, Nipun Kumar Mishra

{"title":"Direction independent broad-band wide angle metamaterial absorber for “K” band applications","authors":"Laxmikant Dewangan, Megh Sainadh Patinavalasa, Juin Acharjee, Shrey Anant Sandiman, Saptarshi Ghosh, Nipun Kumar Mishra","doi":"10.1515/freq-2023-0151","DOIUrl":"https://doi.org/10.1515/freq-2023-0151","url":null,"abstract":"In this work, the design of broadband, wide-angle, direction-independent metamaterial (MM) electromagnetic wave (EM) absorber for K-band frequency application is investigated and validated experimentally. The unit cell of the metamaterial absorber consists of four 90° rotated L-shaped metallic patches imprinted on a dielectric substrate backed by a metallic sheet. The structure yield absorption in the broad frequency ranges from 22.5 to 29.3 GHz for both TE and TM polarized waves with more than 90 % absorptivity having a wide fractional bandwidth of (6.8 GHz) 25.8 %. The structure is four-fold symmetric and hence yields polarization insensitivity for different angles of polarization under both TE and TM polarized waves. The structure is also investigated under oblique incidence where the 80 % absorptivity holds up to 45° incident angles for both TE and TM waves. The absorption mechanism is explained with the help of top and bottom surface current distribution, induced electric field, and parametric analysis. To verify the resonance in the structure, characteristic mode, and equivalent circuit analysis have been carried out and presented. A prototype of the absorber has been fabricated and simulated results are validated with measured results. Measured results are showing good agreement with the simulated responses. The novelty of the proposed absorber lies in its unique metallic pattern on a λ 0/8 (concerning the canter frequency of absorption bandwidth) thin FR-4 substrate while showing the wide absorption bandwidth and direction independence to normal and oblique incidence. The compact nature of the absorber and broadband response with good polarization insensitivity at normal and oblique incidence makes it commercially suitable for the reduction of radar cross section (RCS) in stealth applications at the K-band.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"13 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138520155","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

Profile reduction of folded transmitarray antenna using multiple feeders 使用多个馈线的折叠发射阵列天线的轮廓减小

IF 1.1 4区工程技术

Frequenz Pub Date : 2023-11-17 DOI: 10.1515/freq-2023-0174

Guowei Li, Yuehe Ge, Zhizhang (David) Chen

引用次数: 0

Deep learning based distorted Born iterative method for improving microwave imaging 基于深度学习的畸变Born迭代方法改进微波成像

4区工程技术

Frequenz Pub Date : 2023-11-03 DOI: 10.1515/freq-2023-0074

Amit D. Magdum, Harisha Shimoga Beerappa, Mallikarjun Erramshetty

引用次数: 0

Graphene based waveguide fed hybrid plasmonic terahertz patch antenna 基于石墨烯波导的混合等离子体太赫兹贴片天线

4区工程技术

Frequenz Pub Date : 2023-10-31 DOI: 10.1515/freq-2023-0070

Pallavi Mahankali, Shyamal Mondal, Rama Rao Thipparaju, Susila Mohandoss

{"title":"Graphene based waveguide fed hybrid plasmonic terahertz patch antenna","authors":"Pallavi Mahankali, Shyamal Mondal, Rama Rao Thipparaju, Susila Mohandoss","doi":"10.1515/freq-2023-0070","DOIUrl":"https://doi.org/10.1515/freq-2023-0070","url":null,"abstract":"Abstract The terahertz (THz) technology has fascinated lot of attention due to its enormous potential for a wide range of applications in the public, private and enterprise domains. This research work demonstrates the design structure and analysis of graphene based waveguide fed hybrid plasmonic THz patch antenna (HPTPA) constructed at around 3 THz. Hybrid plasmonic THz waveguide (HPTW) as a feeding line for the proposed THz patch antenna can increases antenna efficiency. The graphene is sandwiched between gallium arsenide (GaAs) and silver (Ag) to confine THz waves efficiently. Using mode analysis in finite element method for the proposed HPTW the propagation length, effective refractive index has been thoroughly examined. Based on the finite element method (FEM) approach, the results of the designed graphene-based waveguide fed HPTPA shows a high effective refractive index of 2.9, large propagation length of 230 µm, gain of 2.29 dBi, bandwidth of 200 GHz and efficiency of 85 % has obtained. The proposed graphene-based waveguide fed HPTPA could be beneficial to enable several photonic integrated circuit applications in next-generation wireless communication.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"123 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135863373","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