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An AMC-Based Circularly Polarized Antenna for 5G sub-6 GHz Communications

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Computers, Materials & Continua 2021年第12期69卷 2997-3013页

作者： hussain Askari niamat hussain Domin Choi MdAbu Sufian Anees Abbas Nam Kim Department of Information and Communication Chungbuk National UniversityCheongju28644Korea

This paper presents an AMC(artificial magnetic conductor)-based wideband circularly polarized printed monopole antenna for unidirectional *** antenna includes an AMC reflector,a coplanar waveguide(CPW)feed structure to excite the antenna,a ground plane with a rectangular slot on the left side of feedline,and an asymmetrical ground plane on its right *** induced surface currents on CWP feedline,rectangularly slotted,and asymmetrical ground planes cause circularly polarized *** AMC reflector consisting periodic metallic square patches is used instead of the conventional PEC(perfect electric conductor)reflector,the distance between the antenna and reflector is reduced from 0.25λ0 to 0.18λ0 with performance *** incorporating AMC layer with the monopole antenna,the gain of antenna is increased from 3.3 dBic to 8.7 dBic while the axial ratio bandwidth(ARBW)of antenna is increased from 27.27%to 51.67%.The simulated and measured results show that the proposed antenna has an overlapping 10-dB|S_(11)|and 3-dB ARBW of 51.67%(3.0–5.09 GHz).The overall dimensions of monopole antenna backed by AMC reflector is 1.20_(λ0)×1.20_(λ0)×0.21_(λ0) and covers 5G sub-6 GHz new radio bands(n77/n78/n79)for wireless communication systems.

关键词： Monopole antenna circular polarization axial ratio AMC

Helix Inspired 28 GHz Broadband Antenna with End-Fire Radiation Pattern

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Computers, Materials & Continua 2022年第1期70卷 1935-1944页

作者： Hijab Zahra Wahaj Abbas Awan niamat hussain Syed Muzahir Abbas Subhas Mukhopadhyay School of Engineering Faculty of Science and EngineeringMacquarie UniversitySydneyNSW2109Australia Department of Integrated IT Engineering Seoul National University of Science and TechnologySeoul01811Korea Department of Information and Communication Engineering Chungbuk National UniversityChungbuk28644Korea BENELEC BotanySydneyNSW2019Australia

This paper presents the design and characterization of a via free planar single turn helix for 28 GHz broadband *** proposed antenna is designed using ROGERS RO4003 material,having a simple structure and end-fire radiation *** antenna comprises of a compact dimension of 1.36λ_(0)×0.9λ_(0) with a thickness of 0.0189λ_(0)(whereλ_(0) is the free-space wavelength at the central frequency of 28 GHz).Parametric study has been carried out to investigate the impact of key design parameters and to achieve an optimum *** show a good agreement between the simulated and measured results.A single turn helical inspired antenna covers−10 dB impedance bandwidth of 26.25-30.14 GHz having a peak gain of 5.83 dB and radiation efficiency up to 85%.Moreover,linear array configurations with 2 and 4 elements have been analyzed for applications with higher gain and space *** array configurations are suitable for applications having space constraints in one *** show that peak gain up to 8.2 dB and 11.1 dB can be achieved with 2 and 4 elements,*** to its simple planar and via free structure,this antenna is suitable for 5G communications and for sensing,imaging,IoT and tracking applications at 28 GHz band spectrum.

关键词： Compact antenna millimeter wave antenna 28 GHz 5G antenna

A Compact Tri-Band Antenna Based on Inverted-L Stubs for Smart Devices

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Computers, Materials & Continua 2022年第2期70卷 3321-3331页

作者： niamat hussain Anees Abbas Sang-Myeong Park Seong Gyoon Park Nam Kim Department of Information and Communication Engineering Chungbuk National UniversityCheongju28644Korea Department of Information and Communication Engineering Kongju National UniversityKongju32588Korea

We designed and constructed a novel,compact tri-band monopole antenna for intelligent *** behavior was achieved by placing inverted-L shaped stubs of various lengths in a triangular monopole antenna fed by a coplanar *** resonance frequency of each band can be controlled by varying the length of the corresponding *** bands,at 2.4(2.37-2.51),3.5(3.34-3.71),and 5.5(4.6-6.4)GHz,were easily obtained using three stubs of different *** miniaturization,a portion of the longest stub(at 2.4 GHz)was printed on the opposite side of the substrate,and connected to the main stub via a shorting *** validate the concept,the antenna was fabricated on a low-cost 1.6-mm-thick FR-4 substrate with dimensions of 20×15×1.6 mm^(3).The antenna exhibited a moderate average gain of 2.9 dBi with an omnidirectional radiations over the bandwidths required for RFID,Bluetooth,ISM,WiMAX,andWLAN-band *** features make the antenna suitable for compact smart devices.

关键词： Multiband antenna compact antenna tri-band antenna CPW antenna stub-loaded antenna

A Frequency Selective Surface Loaded UWB Antenna for High Gain Applications

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Computers, Materials & Continua 2022年第12期73卷 6169-6180页

作者： Wahaj Abbas Awan Do Min Choi niamat hussain Issa Elfergani Seong Gyoon Park Nam Kim Department of Information and Communication Engineering Chungbuk National UniversityCheongju28644Korea Instituto de Telecomunicacoes Campus Universitário de Santiago 3810-193Aveiro Portugal School of Engineering and Informatics Bradford UniversityBradfordBD71DPU.K Department of Information and Communication Engineering Kongju National UniversityKongjuKorea

This paper presents the design of wideband and high gainFrequency Selective Surface(FSS)loaded antenna for ultra-wideband(UWB)wireless applications requiring *** antenna consists of a monopole and an FSS ***,a conventional rectangular monopole antenna is modified using slot and stub to achieve wide operational bandwidth and size *** modified antenna shows 50%miniaturization compared to a primary rectangular monopole,having a wide impedance bandwidth of 3.6-11.8 ***,an FSS is constructed by the combination of circular and square ring *** FSS array consisting of 8×8-unit cells are integrated with the antenna as a reflector to enhance the performance of the proposed miniaturized UWB *** loading of FSS results in an improvement of at least 4 dBi gain in the entire operational ***,the antenna’s bandwidth is also increased at the lower frequency band due to the presence of the FSS.A prototype of the antenna is fabricated and tested to verify the simulation *** simulation and measurement results show that the antenna offers a wideband-10 dB impedance bandwidth ranging from 2.55-13GHz with a stable peak gain of 8.6 dBi and retains the radiation pattern stability.

关键词： FSS UWB antenna high gain antenna FSS reflector