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Asymmetric Patch Element Reflectarray with Dual Linear and Dual Circular Polarization

Computers, materials & Continua 2022年第12期73卷 6085-6101页

作者： m.hashim dahri m.H.Jamaluddin m.Inam m.R.Kamarudin F.C.Seman A.Y.I.Ashyap Z.A.Shamsan K.Almuhanna F.Alorifi Department of Electronic Engineering Dawood University of Engineering and TechnologyKarachiSindh74800Pakistan Wireless Communication Centre Universiti Teknologi Malaysia81301Johor BahruMalaysia Centre for Telecommunication Research&Innovation(CETRI) Faculty of Electrical and Electronic Engineering TechnologyUniversiti Teknikal Malaysia Melaka(UTeM)Melaka76100Malaysia Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn MalaysiaBatu Pahat86400JohorMalaysia Electrical Engineering Department College of EngineeringImam Mohammad Ibn Saud Islamic UniversityRiyadhSaudi Arabia

A reflectarray antenna consisting of asymmetrical patch elements is proposed,which is capable of producing dual linear and dual circular polarized operation at 26GHz *** main purpose of this design is to support four different polarizations using the same patch *** proposed reflectarray has a single layer configuration with a linearly polarized feed and circular ring slots in the ground *** patch element is designed from a square patch element by tilting its one vertical side to some optimized inclination.A wide reflection phase range of 600°is obtained with the asymmetric patch element during unit cell measurements.A 332 element circular aperture reflectarray is designed with the proposed configuration and experimentally validated with a linearly polarized prime feed *** different orientations of mirror and non-mirror asymmetric patch elements on the surface of reflectarray are *** linear polarization is obtained with the mirror orientation of the asymmetric patch elements on the surface of ***,asymmetric patch elements without mirror orientation are demonstrated to produce dual circular polarization with the same linearly polarized feed.A maximum measured gain of 24.4 dB and 26.1 dB is achieved for dual linear and dual circular polarization,*** respective measured efficiencies are 28%and 41.3%,which are supported by amaximum−3 dB gain bandwidth of 13.8%and 11.5%.The circular polarization operation of the reflectarray is also supported by a 6 dB axial ratio bandwidth of 9.2%.The proposed asymmetric patch reflectarray antenna with polarization diversity,wide bandwidth and high gain is suitable to be used in many high frequency applications of 5G communication.

关键词： 5G reflectarray polarization diversity circular polarization

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Triple-Band metamaterial Inspired Antenna for Future Terahertz(THz)Applications

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Computers, materials & Continua 2022年第7期72卷 1071-1087页

作者： Adel Y.I.Ashyap S.Alamri S.H.Dahlan Z.Z.Abidin m.Inam Abbasi Huda A.majid m.R.Kamarudin Y.A.Al-Gumaei m.hashim dahri Center for Applied Electromagnetic(EmCenter) Faculty of Electrical and Electronic EngineeringUniversiti Tun Hussein Onn Malaysia(UTHM)Batu Pahat86400JohorMalaysia Faculty of Engineering Electrical Engineering Dep. Al Baha UniversityAlaqiq65799Al-BahaSaudi Arabia Advanced Telecommunication Research Center(ATRC) Faculty of Electrical and Electronic EngineeringUniversiti Tun Hussein Onn Malaysia(UTHM)Batu Pahat86400JohorMalaysia Faculty of Electrical and Electronic Engineering Technology Universiti Teknikal Malaysia MelakaHang Tua Jaya76100Durian TunggalMelakaMalaysia Department of mathematics Physicsand Electrical EngineeringNorthumbria UniversityNE18ST Newcastle Upon TyneUK Department of Electronic Engineering Dawood University of Engineering and TechnologyKarachi74800Pakistan

For future healthcare in the terahertz(THz)band,a triple-band microstrip planar antenna integrated with metamaterial(mTm)based on a polyimide substrate is *** frequencies of operation are 500,600,and 880 *** triple-band capability is accomplished by etching metamaterial on the patch without affecting the overall antenna *** of a partial ground plane,a full ground plane is used as a buffer to shield the body from back radiation emitted by the *** overall dimension of the proposed antenna is 484×484μm^(2).The antenna’s performance is investigated based on different crucial factors,and excellent results are *** gain for the frequencies 500,600,880GHz is 6.41,6.77,10.1 dB,respectively while the efficiency for the same frequencies is 90%,95%,96%,*** research has been conducted by mounting the presented antenna on a single phantom layer with varying dielectric *** results show that the design works equally well with and without the phantom model,in contrast to a partially ground antenna,whose performance is influenced by the presence of the phantom *** a result,the presented antenna could be helpful for future healthcare applications in the THz band.

关键词： THz metamaterial triple-band wireless body area networks(WBAN)

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multi-Band metamaterial Antenna for Terahertz Applications

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Computers, materials & Continua 2023年第1期74卷 1765-1782页

作者： Adel Y.I.Ashyap m.Inam m.R.Kamarudin m.H.dahri Z.A.Shamsan K.Almuhanna F.Alorifi Faculty of Engineering Technology Universiti Tun Hussein Onn Malaysia(UTHM)Batu Pahat86400JohorMalaysia Centre for Telecommunication Research&Innovation(CETRI) Faculty of Electrical and Electronic Engineering TechnologyUniversiti Teknikal Malaysia Melaka(UTeM)Melaka76100Malaysia Department of Electronic Engineering Dawood University of Engineering and Technology74800KarachiPakistan Electrical Engineering Department College of EngineeringImam Mohammad Ibn Saud Islamic UniversityRiyadhSaudi Arabia

A multi-band metamaterial antenna is proposed to operate at the terahertz(THz)band for medical *** proposed structure is designed on a polyimide as a support layer,and its radiating elements are made of ***,the design is started with a conventional shape showing a single operating frequency at 1.1 *** achieve a multi-band operating frequency,the conventional shape was replaced with the proposed metamaterial as a radiating patch that has properties not exist in *** multi-band frequencies are obtained without compromising the overall size of the *** overall size is 600×600×25μm^(3).The operating frequencies are 0.36,0.49,0.69,0.87,and 1.04 THz.A full ground plane is used to behave as isolation between the design and the human body *** proposed design is investigated on free space and on the human body model,showing excellent performance in both *** achieved gains for the following frequencies 0.36,0.49,0.69,0.87,and 1.04 THz are 4.81,6.5,8.41,6.02,and 7.96 dB,respectively,while the efficiencies are 83.91%,96.28%,90.80%,91.71%,and 92.99%,*** conventional design was modified to have a partial ground to show the benefit of using the full *** design is loaded on the human body model and its performance is *** efficiency and gain are 6.61 dB and 95.58.7%for the case of no human body model,and 4.26 dB and 40.30%for the case of using a human body ***,the proposed metamaterial antenna will be useful for future medical applications in the THz band.

关键词： THz 5G a multi-band metamaterials 6G WBAN

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Linearly Polarized millimeter Wave Reflectarray with mutual Coupling Optimization

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Computers, materials & Continua 2022年第8期72卷 2397-2410页

作者： m.Inam m.H.dahri m.R.Kamarudin A.Y.I.Ashyap m.H.Jamaluddin N.H.Sulaiman m.A.Khan Z.A.Shamsan K.Almuhanna F.Alorifi Centre for Telecommunication Research&Innovation(CETRI) Faculty of Electrical and Electronic Engineering TechnologyUniversiti Teknikal Malaysia Melaka(UTeM)Melaka76100Malaysia Dawood University of Engineering and Technology Karachi City Sindh74800Pakistan Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn MalaysiaBatu Pahat86400JohorMalaysia Wireless Communication Centre Universiti Teknologi MalaysiaJohor Bahru81301Malaysia Faculty of Computing and Engineering Quest International UniversityIpoh30250PerakMalaysia Balochistan University of Information Technology(FICT) Engineering and Management SciencesQuettaPakistan Electrical Engineering Department College of EngineeringImam Mohammad Ibn Saud Islamic UniversityRiyadhSaudi Arabia

This work provides the design and analysis of a single layer,linearly polarized millimeter wave reflectarray antenna with mutual coupling *** analysis was carried out at 26GHz design frequency using the simulations of the reflectarray unit cells as well as the periodic reflectarray *** simulated results were verified by the scattering parameter and far-fieldmeasurements of the unit cell and periodic arrays,*** agreement between the simulated and measured results was observed in all the *** from the unit cells and reflectarray,the waveguide and horn antenna were also fabricated to be used in the *** measured scattering parameter results of the proposed circular ring unit cells provided a maximum reflection loss of 2.8 dB with phase errors below 10°.On the other hand,the measured far-field results of the 20×20 reflectarray antenna provided a maximum gain of 26.45 dB with a maximum 3 dB beam width of 12°and 1 dB gain drop bandwidth of 13.1%.The performance demonstrated by the proposed reflectarray antenna makes it a potential candidate to be used in modern-day applications such as 5th Generation(5G)and 6th Generation(6G)communication systems.

关键词： Reflectarray millimeter wave antenna mutual coupling antenna measurements

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Effect of Abscisic Acid on NaCI Stressed Callus Proliferation and Plant Regeneration in Rice

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Journal of Life Sciences 2012年第1期6卷 48-54页

作者： ikram-ul-Haq Ghulam Yasin mumtaz Hussain Ali mohammad dahri Institute of Biotechnology and Genetic Engineering （IBGE） University of Sindh Jamshoro 76080 Pakistan Institute of Pure and Applied Biology Bahauddin Zakariya University Multan Pakistan Department of Botany Universuity of Agriculture Faisalabad 38040 Pakistan

In rice, 2,4-Dichlorphenoxyacetic acid （mS2） has been considered best for callus induction and combination ofNAA, IAA, ABA （mS3） for somatic embryogenesis. Efficient plant regeneration was observed when mS basal salts supplied with 3% sorbitol and 3% maltose as carbon sources without hormones （mSac）. During this experiment, effect of sodium chloride （NaCl） and abscisic acid （ABA） was assessed on callus growth, plant regeneration and root induction efficiency of rice （Oryza sativa L.） varieties IR-6 and Basmati-370. Callus proliferation rate was highly decreased in both varieties on mS2b （100 mol.m3 NaCl ＋ 0.5 mg＇L1 ABA） than mS2a （100 mol＇m3 NaCl） cultures significantly. Proline, glycine-betaine and reducing sugars were increased significantly in mS2a and mS2b callusing cultures. However, total proteins were decreased in mS2a, while slightly increased in mS2b. maximum plant regeneration （9.42 ±0.54 and 10.67 ±0.50 ***1） from somatic embryos was observed on mS4c in IR-6 and Basmati-370, while 1.56 ± 0.06 （IR-6） and 0.95 ±0.05 （Basmati-370） plantlets callus1 were observed on mSab （100 mol·m3 NaCl）. No plant regeneration was observed on mS4b （100 mol·m3 NaCl ＋ 0.5 mg·L-1 ABA） medium in both varieties. Inhibition of root induction efficiency was high in mSsb （100 mol·m3 NaCl ＋ 0.5 mg·L-1 ABA） than mS5a （100 mol·m3 NaCl） in the stressed cultures （P 〈 0.05）. In this experiment, it was concluded that ABA involved in somatic embryogenesis and elevation of NaCl stress, while it causes inhibition of cell＇s growth as well as its regeneration into plantlets from somatic embryos.

关键词： Oryza sativa L. NaCl ABA embryogenic callus somatic embryogenesis bio-contents.

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