Displaying publications 141 - 160 of 794 in total

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  1. Development of regenerated cellulose/halloysite nanotube bionanocomposite films with ionic liquid
    Soheilmoghaddam M, Wahit MU
    Int J Biol Macromol, 2013 Jul;58:133-9.
    PMID: 23567285 DOI: 10.1016/j.ijbiomac.2013.03.066
    In this study, novel nanocomposite films based on regenerated cellulose/halloysite nanotube (RC/HNT) have been prepared using an environmentally friendly ionic liquid 1-butyl-3-methylimidazolium chloride (BMIMCl) through a simple green method. The structural, morphological, thermal and mechanical properties of the RC/HNT nanocomposites were investigated using X-ray diffraction (XRD), Fourier transform infrared (FTIR), field emission scanning electron microscopy (FESEM), thermal analysis and tensile strength measurements. The results obtained revealed interactions between the halloysite nanotubes and regenerated cellulose matrix. The thermal stability and mechanical properties of the nanocomposite films, compared with pure regenerated cellulose film, were significantly improved When the halloysite nanotube (HNT) loading was only 2 wt.%, the 20% weight loss temperature (T20) increased 20°C. The Young's modulus increased from 1.8 to 4.1 GPa, while tensile strength increased from 35.30 to 60.50 MPa when 8 wt.% halloysite nanotube (HNT) was incorporated, interestingly without loss of ductility. The nanocomposite films exhibited improved oxygen barrier properties and water absorption resistance compared to regenerated cellulose.
    Matched MeSH terms: Green Chemistry Technology
  2. Fulltext Staff reflection on the effectiveness of whatsapp usage for organizational communication: a study in a private Malaysian medical school
    Sohayla M. Attalla, Jalal Ebrahim, Hassan Ads, Najibah Abdul Razak, Nabishah Mohamad
    Malaysian Journal of Medicine and Health Sciences, 2020;16(107):57-62.
    MyJurnal
    Introduction: Recently mobile communication technology had tremendous advances and became the priority for most of the users with some opponent opinions that highlight the accountability and the privacy issues in using these messaging applications. WhatsApp is scored to be the first top used messaging application worldwide that is used in 180 countries by about 1.5 billion population. This research aims to determine the staff reflections regarding the WhatsApp usage for organizational communication. Methods: This study is implied among the staff at the medical and health life science cluster, Management and Science University (MSU), Malaysia. A questionnaire was distributed to all the staff through an online google form. Responses were analysed by the ‘Statistical Package for Social Sciences’ (SPSS) Version 24.0. Results: Results showed that all the staff responded (100%) are using WhatsApp for organizational communication with variable degrees of satisfaction; 8.1% are extremely satisfied, 61.3 % are satisfied, 12.9% are not satisfied and 16.1 % are extremely not satisfied. Their level of satisfaction is significantly affected by the respondent’s age, benefit of usage, and the time of messaging. Conclusion: To ensure effectiveness of communication through WhatsApp, it should be through official groups and the organization should put specific announced rules for the time of usage and the content of messages to be posted to all members.
    Matched MeSH terms: Technology
  3. Fulltext Screening of medical students’ intention to practice mobile – learning in Malaysia
    Sohayla M. Attalla, Nihal A. Hanafy, Mahfuza Akter, Sakinah Ruhi
    Malaysian Journal of Medicine and Health Sciences, 2020;16(107):40-45.
    MyJurnal
    Introduction: The twenty-first-century learning is adopting the student-centered learning techniques and the teach- ers are mainly facilitators to direct the process of learning and so social media and mobile applications became an important learning platform. Mobile learning (M-learning) is the practice of learning activities through a portable device such as cellular phone or a personal digital assistant. The aim of this research is to screen the medical stu- dents’ intention toward the adoption of M-learning and to determine factors affecting the intentions of the medical students to practice M-learning. Methods: A cross-sectional study among medical students was performed through a questionnaire based on the Theory of Reasoned Action and the Technology Acceptance Model. The study included 129 students in different stages of the medical study. Results: Results showed that the factors affecting the students’ inten¬tion to practice M-learning include the students’ attitude, perceived usefulness, perceived ease of use, and availability of resources. In the current sample 82.7% of students are already using M-Learning; 41.7% are using it for assessment, 22.8% are using it for learning and 35.5% are using it for both. Conclusion: It was concluded that most medical students have higher intention to adopt M-learning and they are mostly using it for assessment purposes rather than in learning.
    Matched MeSH terms: Technology
  4. Labor markets and economic development in Malaysia
    Smith JP
    Res Popul Econ, 1991;7:131-56.
    PMID: 12317026
    Matched MeSH terms: Technology
  5. Fulltext Sustainable Syntheses of (-)-Jerantinines A & E and Structural Characterisation of the Jerantinine-Tubulin Complex at the Colchicine Binding Site
    Smedley CJ, Stanley PA, Qazzaz ME, Prota AE, Olieric N, Collins H, et al.
    Sci Rep, 2018 Jul 13;8(1):10617.
    PMID: 30006510 DOI: 10.1038/s41598-018-28880-2
    The jerantinine family of Aspidosperma indole alkaloids from Tabernaemontana corymbosa are potent microtubule-targeting agents with broad spectrum anticancer activity. The natural supply of these precious metabolites has been significantly disrupted due to the inclusion of T. corymbosa on the endangered list of threatened species by the International Union for Conservation of Nature. This report describes the asymmetric syntheses of (-)-jerantinines A and E from sustainably sourced (-)-tabersonine, using a straight-forward and robust biomimetic approach. Biological investigations of synthetic (-)-jerantinine A, along with molecular modelling and X-ray crystallography studies of the tubulin-(-)-jerantinine B acetate complex, advocate an anticancer mode of action of the jerantinines operating via microtubule disruption resulting from binding at the colchicine site. This work lays the foundation for accessing useful quantities of enantiomerically pure jerantinine alkaloids for future development.
    Matched MeSH terms: Green Chemistry Technology
  6. Health technology assessment in the Asia Pacific region
    Sivalal S
    Int J Technol Assess Health Care, 2009 Jul;25 Suppl 1:196-201.
    PMID: 19534841 DOI: 10.1017/S0266462309090631
    Although health technology assessment (HTA) has been well established in all developed countries, it has not found a firm footing in many developing countries. This is especially true of the Asia Pacific region, which has much of the world population.
    Matched MeSH terms: Technology Assessment, Biomedical*
  7. History of health technology assessment: a commentary
    Sivalal S
    Int J Technol Assess Health Care, 2009 Jul;25 Suppl 1:285-7.
    PMID: 19527548 DOI: 10.1017/S0266462309090771
    Matched MeSH terms: Technology Assessment, Biomedical/history*
  8. A training course in health technology assessment in Malaysia
    Sivalal S, Banta HD, 't Hoen EF, Rusilawati J
    Int J Technol Assess Health Care, 1998;14(4):809-17.
    PMID: 9885469
    This article describes a 1-week training course in health technology assessment (HTA) presented in Malaysia by the Ministry of Health in 1996. Malaysia established an HTA unit in the Ministry of Health in 1995 and a National Health Technology Assessment Program in 1996. The purpose of the course was to develop HTA knowledge and skills in Malaysia, since these are largely lacking. The course consisted of didactic sessions and group work. Didactic sessions covered the principles of HTA. Group work was for the purpose of developing practical skills, and was based on reports from HTA agencies, published articles, and candidates for assessment suggested by course participants. Course participants were a mix of physicians, nurses, hospital administrators, and Ministry of Health officials. Experiences in this course may be helpful to others who wish to organize training courses in developing countries.
    Matched MeSH terms: Technology Assessment, Biomedical*
  9. Cavitation technology - a greener processing technique for the generation of pharmaceutical nanoemulsions
    Sivakumar M, Tang SY, Tan KW
    Ultrason Sonochem, 2014 Nov;21(6):2069-83.
    PMID: 24755340 DOI: 10.1016/j.ultsonch.2014.03.025
    Novel nanoemulsion-based drug delivery systems (DDS) have been proposed as alternative and effective approach for the delivery of various types of poorly water-soluble drugs in the last decade. This nanoformulation strategy significantly improves the cell uptake and bioavailability of numerous hydrophobic drugs by increasing their solubility and dissolution rate, maintaining drug concentration within the therapeutic range by controlling the drug release rate, and reducing systemic side effects by targeting to specific disease site, thus offering a better patient compliance. To date, cavitation technology has emerged to be an energy-efficient and promising technique to generate such nanoscale emulsions encapsulating a variety of highly potent pharmaceutical agents that are water-insoluble. The micro-turbulent implosions of cavitation bubbles tear-off primary giant oily emulsion droplets to nano-scale, spontaneously leading to the formation of highly uniform drug contained nanodroplets. A substantial body of recent literatures in the field of nanoemulsions suggests that cavitation is a facile, cost-reducing yet safer generation tool, remarkably highlighting its industrial commercial viability in the development of designing novel nanocarriers or enhancing the properties of existing pharmaceutical products. In this review, the fundamentals of nanoemulsion and the principles involved in their formation are presented. The underlying mechanisms in the generation of pharmaceutical nanoemulsion under acoustic field as well as the advantages of using cavitation compared to the conventional techniques are also highlighted. This review focuses on recent nanoemulsion-based DDS development and how cavitation through ultrasound and hydrodynamic means is useful to generate the pharmaceutical grade nanoemulsions including the complex double or submicron multiple emulsions.
    Matched MeSH terms: Green Chemistry Technology/methods*
  10. Barriers to effective implementation of end-of-life vehicle management in Indonesia
    Sitinjak C, Simic V, Ismail R, Bacanin N, Musselwhite C
    Environ Sci Pollut Res Int, 2023 Aug;30(37):87286-87299.
    PMID: 37422560 DOI: 10.1007/s11356-023-28554-1
    Effective end-of-life vehicle (ELV) management is crucial for minimizing the environmental and health impacts of Indonesia's growing automotive industry. However, proper ELV management has received limited attention. To bridge this gap, we conducted a qualitative study to identify barriers to effective ELV management in Indonesia's automotive sector. Through in-depth interviews with key stakeholders and a strengths, weaknesses, opportunities, and threats analysis, we identified internal and external factors influencing ELV management. Our findings reveal major barriers, including inadequate government regulation and enforcement, insufficient infrastructure and technology, low education and awareness, and a lack of financial incentives. We also identified internal factors such as limited infrastructure, inadequate strategic planning, and challenges in waste management and cost collection methods. Based on these findings, we recommend a comprehensive and integrated approach to ELV management involving enhanced coordination among government, industry, and stakeholders. The government should enforce regulations and provide financial incentives to encourage proper ELV management practices. Industry players should invest in technology and infrastructure to support effective ELV treatment. By addressing these barriers and implementing our recommendations, policymakers can develop sustainable ELV management policies and decisions in Indonesia's fast-paced automotive sector. Our study contributes valuable insights to guide the development of effective strategies for ELV management and sustainability in Indonesia.
    Matched MeSH terms: Technology
  11. Fulltext A review on techniques and challenges in sentiment analysis of student’s comments
    Siti Rohaidah Ahmad, Nurhafizah Moziyana Mohd Yusof, Siti Hajar Zainal Rashid, Abdul Ghapor Hussin
    ZULFAQAR International Journal of Defence Science, Engineering & Technology, 2020;3(2):32-36.
    MyJurnal
    Assessment of instructors by students is needed for assessing the teaching quality of a lecturer towards achieving the objectives of a course. This paper aims to examine the techniques used in sentiment analysis for assessing the effectiveness of a lecturer’s or a teacher’s teaching style in the learning process at a university or school. In addition, the effectiveness of sentiment analysis techniques in assisting the teaching evaluation process is also discussed. The challenges for assessing the quality of teaching of National Defence University of Malaysia (UPNM) lecturers are also discussed in this paper. The sentiment analysis technology is capable of analysing views or opinions on a matter, regardless of whether they are positive or negative. Data from the sentiment analysis can be used by specific parties or anyone else to rectify any weakness or to improve any aspect that the user commented on. The purpose of this study is not to find the weakness of the lecturer, but rather the results of this assessment process can be useful to the management for rectifying weaknesses and for improving the teaching process.
    Matched MeSH terms: Technology
  12. Fulltext Laboratory scale electron beam system for treatment of flue gases from diesel combustion
    Siti A'iasah Hashim, Khairul Zaman Mohd Dahlan, Khomsaton Abu Bakar, Ayub Muhamad
    Journal of Nuclear and Related Technologies, 2004;2004(2):29-37.
    MyJurnal
    A laboratory scale test rig to treat simulated flue gas using electron beam technology was installed at the Alurtron EB-Irradiation Center, MINT. The experiment test rig was proposed as a result of feasibility studies conducted jointly by IAEA, MINT and TNB Research in 1997. The test rig system consists of several components, among others, diesel generator sets, pipe ducts, spray cooler, ammonia dosage system, irradiation vessel, bag filter and gas analyzers. The installation was completed and commissioned in October 2001. Results from the commissioning test runs and subsequent experimental work showed that the efficiency of flue gas treatment is high. It was proven that electron beam technology might be applied in the treatment of air pollutants. This paper describes the design and work function of the individual major components as well as the full system function. Results from the initial experimental works are also presented.
    Matched MeSH terms: Technology
  13. Reflections on a decade of research by ASEAN dental faculties: analysis of publications from ISI-WOS databases from 2000 to 2009
    Sirisinha S, Koontongkaew S, Phantumvanit P, Wittayawuttikul R
    J Investig Clin Dent, 2011 May;2(2):72-80.
    PMID: 25426599 DOI: 10.1111/j.2041-1626.2011.00048.x
    This communication analyzed research publications in dentistry in the Institute of Scientific Information Web of Science databases of 10 dental faculties in the Association of South-East Asian Nations (ASEAN) from 2000 to 2009. The term used for the "all-document types" search was "Faculty of Dentistry/College of Dentistry." Abstracts presented at regional meetings were also included in the analysis. The Times Higher Education System QS World University Rankings showed that universities in the region fare poorly in world university rankings. Only the National University of Singapore and Nanyang Technological University appeared in the top 100 in 2009; 19 universities in the region, including Indonesia, Malaysia, the Philippines, Singapore, and Thailand, appeared in the top 500. Data from the databases showed that research publications by dental institutes in the region fall short of their Asian counterparts. Singapore and Thailand are the most active in dental research of the ASEAN countries.
    Matched MeSH terms: Technology
  14. Fulltext Land cover classification of ALOS PALSAR data using maximum likelihood and dual mode polarization
    Sim, C.K., Abdullah, K., Mat Jafri, M.Z., Lim, H.S.
    Pertanika Journal of Science & Technology, 2011;19(3):83-88.
    MyJurnal
    Microwave Remote sensing data have been widely used in land cover and land use classification. The objective of this research paper is to investigate the feasibility of the multi-polarized ALOS-PALSAR data for land cover mapping. This paper presents the methodology and preliminary result including data acquisitions, data processing and data analysis. Standard supervised classification techniques such as the maximum likelihood, minimum distance-to-mean, and parallelepiped were applied to the ALOS-PALSAR images in the land cover mapping analysis. The PALSAR data training areas were chosen based on the information obtained from
    optical satellite imagery. The best supervise classifier was selected based on the highest overall accuracy and
    kappa coefficient. This study indicated that the land cover of Butterworth, Malaysia can be mapped accurately
    using ALOS PALSAR data.
    Matched MeSH terms: Remote Sensing Technology
  15. The potential reuse of biodegradable municipal solid wastes (MSW) as feedstocks in vermicomposting
    Sim EY, Wu TY
    J Sci Food Agric, 2010 Oct;90(13):2153-62.
    PMID: 20718020 DOI: 10.1002/jsfa.4127
    There is an urgent need globally to find alternative sustainable steps to treat municipal solid wastes (MSW) originated from mismanagement of urban wastes with increasing disposal cost. Furthermore, a conglomeration of ever-increasing population and consumerist lifestyle is contributing towards the generation of more MSW. In this context, vermicomposting offers excellent potential to promote safe, hygienic and sustainable management of biodegradable MSW. It has been demonstrated that, through vermicomposting, MSW such as city garbage, household and kitchen wastes, vegetable wastes, paper wastes, human faeces and others could be sustainably transformed into organic fertiliser or vermicompost that provides great benefits to agricultural soil and plants. Generally, earthworms are sensitive to their environment and require temperature, moisture content, pH and sometimes ventilation at proper levels for the optimum vermicomposting process. Apart from setting the optimum operational conditions for the vermicomposting process, other approaches such as pre-composting, inoculating micro-organisms into MSW and redesigning the conventional vermireactor could be introduced to further enhance the vermicomposting of MSW. Thus the present mini-review discusses the potential of introducing vermicomposting in MSW management, the benefits of vermicomposted MSW to plants, suggestions on how to enhance the vermicomposting of MSW as well as risk management in the vermicomposting of MSW.
    Matched MeSH terms: Technology Transfer; Green Chemistry Technology
  16. Sensor-Based mHealth Authentication for Real-Time Remote Healthcare Monitoring System: A Multilayer Systematic Review
    Shuwandy ML, Zaidan BB, Zaidan AA, Albahri AS
    J Med Syst, 2019 Jan 06;43(2):33.
    PMID: 30612191 DOI: 10.1007/s10916-018-1149-5
    The new and groundbreaking real-time remote healthcare monitoring system on sensor-based mobile health (mHealth) authentication in telemedicine has considerably bounded and dispersed communication components. mHealth, an attractive part in telemedicine architecture, plays an imperative role in patient security and privacy and adapts different sensing technologies through many built-in sensors. This study aims to improve sensor-based defence and attack mechanisms to ensure patient privacy in client side when using mHealth. Thus, a multilayer taxonomy was conducted to attain the goal of this study. Within the first layer, real-time remote monitoring studies based on sensor technology for telemedicine application were reviewed and analysed to examine these technologies and provide researchers with a clear vision of security- and privacy-based sensors in the telemedicine area. An extensive search was conducted to find articles about security and privacy issues, review related applications comprehensively and establish the coherent taxonomy of these articles. ScienceDirect, IEEE Xplore and Web of Science databases were investigated for articles on mHealth in telemedicine-based sensor. A total of 3064 papers were collected from 2007 to 2017. The retrieved articles were filtered according to the security and privacy of sensor-based telemedicine applications. A total of 19 articles were selected and classified into two categories. The first category, 57.89% (n = 11/19), included survey on telemedicine articles and their applications. The second category, 42.1% (n = 8/19), included articles contributed to the three-tiered architecture of telemedicine. The collected studies improved the essential need to add another taxonomy layer and review the sensor-based smartphone authentication studies. This map matching for both taxonomies was developed for this study to investigate sensor field comprehensively and gain access to novel risks and benefits of the mHealth security in telemedicine application. The literature on sensor-based smartphones in the second layer of our taxonomy was analysed and reviewed. A total of 599 papers were collected from 2007 to 2017. In this layer, we obtained a final set of 81 articles classified into three categories. The first category of the articles [86.41% (n = 70/81)], where sensor-based smartphones were examined by utilising orientation sensors for user authentication, was used. The second category [7.40% (n = 6/81)] included attack articles, which were not intensively included in our literature analysis. The third category [8.64% (n = 7/81)] included 'other' articles. Factors were considered to understand fully the various contextual aspects of the field in published studies. The characteristics included the motivation and challenges related to sensor-based authentication of smartphones encountered by researchers and the recommendations to strengthen this critical area of research. Finally, many studies on the sensor-based smartphone in the second layer have focused on enhancing accurate authentication because sensor-based smartphones require sensors that could authentically secure mHealth.
    Matched MeSH terms: Remote Sensing Technology/methods*; Remote Sensing Technology/standards
  17. Fulltext Mobile Health Technology Use and the Acceptability of an mHealth Platform for HIV Prevention Among Men Who Have Sex With Men in Malaysia: Cross-sectional Respondent-Driven Sampling Survey
    Shrestha R, Maviglia F, Altice FL, DiDomizio E, Khati A, Mistler C, et al.
    J Med Internet Res, 2022 Jul 25;24(7):e36917.
    PMID: 35877172 DOI: 10.2196/36917
    BACKGROUND: The growth in mobile technology access, utilization, and services holds great promise in facilitating HIV prevention efforts through mobile health (mHealth) interventions in Malaysia. Despite these promising trends, there is a dearth of evidence on the use of mHealth platforms that addresses HIV prevention among Malaysian men who have sex with men.

    OBJECTIVE: The goal of this study was to gain insight into (1) access and utilization of communication technology (eg, landline phone, internet, mobile phone), (2) acceptability of mHealth-based interventions for HIV prevention services, and (3) preferences regarding the format and frequency of mHealth interventions among Malaysian men who have sex with men.

    METHODS: We conducted a cross-sectional survey with Malaysian men who have sex with men between July 2018 and March 2020. Participants were recruited using respondent-driven sampling in the Greater Kuala Lumpur region of Malaysia. We collected information on demographic characteristics, HIV risk-related behaviors, access to and the frequency of use of communication technology, and acceptability of using mHealth for HIV prevention using a self-administered questionnaire with a 5-point scale (1, never; 2, rarely; 3, sometimes; 4, often; 5, all the time).

    RESULTS: A total of 376 men participated in the survey. Almost all respondents owned or had access to a smartphone with internet access (368/376, 97.9%) and accessed the internet daily (373/376, 99.2%), mainly on a smartphone (334/376, 88.8%). Participants on average used smartphones primarily for social networking (mean 4.5, SD 0.8), followed by sending or receiving emails (mean 4.0, SD 1.0), and searching for health-related information (mean 3.5, SD 0.9). There was high acceptance of the use of mHealth for HIV prevention (mean 4.1, SD 1.5), including for receiving HIV prevention information (345/376, 91.8%), receiving medication reminders (336/376, 89.4%), screening and monitoring sexual activity (306/376, 81.4%) or illicit drug use (281/376, 74.7%), and monitoring drug cravings (280/376, 74.5%). Participants overwhelmingly preferred a smartphone app over other modalities (eg, text, phone call, email) for engaging in mHealth HIV prevention tools. Preference for app notifications ranged from 186/336 (53.9%), for receiving HIV prevention information, to 212/336 (69.3%), for screening and monitoring sexual activity. Acceptance of mHealth was higher for those who were university graduates (P=.003), living in a relationship with a partner (P=.04), engaged in sexualized drug use (P=.01), and engaged in receptive anal sex (P=.006).

    CONCLUSIONS: Findings from this study provide support for developing and deploying mHealth strategies for HIV prevention using a smartphone app in men who have sex with men-a key population with suboptimal engagement in HIV prevention and treatment.

    Matched MeSH terms: Technology; Biomedical Technology
  18. Linear cavity Brillouin fiber laser with improved characteristics
    Shirazi MR, Harun SW, Biglary M, Ahmad H
    Opt Lett, 2008 Apr 15;33(8):770-2.
    PMID: 18414527
    A configuration for linear cavity Brillouin fiber laser (BFL) generation is demonstrated using a standard single-mode fiber, two optical circulators, a 3 dB coupler, and a 95/5 coupler to allow high efficiency. With a Brillouin pump (BP) power of 13 dBm, the laser peak power is 12.3 dB higher than a conventional linear cavity BFL at an upshifted wavelength of 0.086 nm from the BP wavelength. In addition, it is revealed that the BFL peak power can be higher than the transmitted BP peak power when the BP power exceeds the second Brillouin Stokes threshold power.
    Matched MeSH terms: Fiber Optic Technology
  19. In Situ Gelling Ophthalmic Drug Delivery System: An Overview and Its Applications
    Sheshala R, Kok YY, Ng JM, Thakur RR, Dua K
    Recent Pat Drug Deliv Formul, 2015;9(3):237-48.
    PMID: 26205681
    Ophthalmic drug delivery system is very interesting and challenging due to the normal physiologically factor of eyes which reduces the bioavailability of ocular products. The development of new ophthalmic dosage forms for existing drugs to improve efficacy and bioavailability, patient compliance and convenience has become one of the main trend in the pharmaceuticals industry. The present review encompasses various conventional and novel ocular drug delivery systems, methods of preparation, characterization and recent research in this area. Furthermore, the information on various commercially available in situ gel preparations and the existing patents of in situ drug delivery systems i.e. in situ gel formation of pectin, in situ gel for therapeutic use, medical uses of in situ formed gels and in situ gelling systems as sustained delivery for front of eye are also covered in this review.
    Matched MeSH terms: Technology, Pharmaceutical/methods*
  20. Fulltext A novel single-feed hybrid reconfigurable microstrip patch antenna for 5G mobile communication and radio frequency energy harvesting applications at 28/38GHz
    Shereen MK, Khattak MI, Zubir F, Basit A
    PLoS One, 2022;17(1):e0260407.
    PMID: 35041686 DOI: 10.1371/journal.pone.0260407
    Reconfigurable antennas have received much attention in RF energy harvesting models owing to their selectivity for operating frequency and polarization. The characteristic of having frequency selectivity and polarization selectivity can be termed as frequency diversity and polarization diversity, respectively. This paper investigates a rectenna device with a new proposed topology in order to eliminate coupling between input and output lines and increase the rectification efficiency with the use of single feed hybrid reconfigurable antenna, switch between 28GHz and 38GHz frequency. Moreover, it is designed to charge a rechargeable battery of 1watt(W). The Reconfiguration mechanism is realized by electronically controlling different states of Switches. PIN Diode (as RLC Equivalent circuit) is used as a switch for ON/OFF states. This antenna mainly comprises rectangular shaped patches (28GHz and 38GHz) with Triango-Truncated edge at the corners. Eighteen PIN Diodes are placed symmetrically throughout the antenna presenting as, S1 & S2 for frequency reconfiguration, S3 to S6 & S7 to S10 connects Triango Truncated edge at the corners for polarization reconfiguration, and for radiation pattern reconfiguration at S11 to S14 & S15 to S18 has been used. The proposed antenna model is capable of simultaneously changing, the radiation patterns as clock and anti-clockwise directions at ±90-degree shift in E and H planes, circularly polarized (CP) states among, Linear Polarization (LP), Right Hand Circularly Polarization (RHCP), and Left Hand Circularly Polarization (LHCP). The current design describes using single antenna for energy harvesting and 5G mobile communication application. This would lead to higher output currents, leading to the ability to efficiently charge a wide variety of batteries. A fully functional prototype has been designed, fabricated and its compound reconfiguration characteristics have been validated for simulated and measured results. For validation of results, the experimental results and the simulation results from the proposed mathematical model were made into comparison, and excellent correlation between the measured and simulated results was obtained.
    Matched MeSH terms: Wireless Technology*
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