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Search Results (4)
  • Open Access


    Th-Shaped Tunable Multi-Band Antenna for Modern Wireless Applications

    Wasi Ur Rehman Khan1, Muhammad Fawad Khan1, Muhammad Irfan2, Sadiq Ullah1, Naveed Mufti1, Usman Ali1, Rizwan Ullah1, Fazal Muhammad3,*, Saifur Rahman2, Faisal Althobiani4, Mohammed Alshareef5, Mohammad E. Gommosani6

    CMC-Computers, Materials & Continua, Vol.74, No.2, pp. 2517-2530, 2023, DOI:10.32604/cmc.2023.031833

    Abstract A compact, reconfigurable antenna supporting multiple wireless services with a minimum number of switches is found lacking in literature and the same became the focus and outcome of this work. It was achieved by designing a Th-Shaped frequency reconfigurable multi-band microstrip planar antenna, based on use of a single switch within the radiating structure of the antenna. Three frequency bands (i.e., 2007–2501 MHz, 3660–3983 MHz and 9341–1046 MHz) can be operated with the switch in the ON switch state. In the OFF state of the switch, the antenna operates within the 2577–3280 MHz and 9379–1033 MHz Bands. The proposed antenna shows an acceptable input impedance… More >

  • Open Access


    The Laplacian Energy of Hesitancy Fuzzy Graphs in Decision-Making Problems

    N. Rajagopal Reddy1, Mohammad Zubair Khan2, S. Sharief Basha3, Abdulrahman Alahmadi2, Ahmed H. Alahmadi2, Chiranji Lal Chowdhary4,*

    Computer Systems Science and Engineering, Vol.44, No.3, pp. 2637-2653, 2023, DOI:10.32604/csse.2023.029255

    Abstract Decision-making (DM) is a process in which several persons concurrently engage, examine the problems, evaluate potential alternatives, and select an appropriate option to the problem. Technique for determining order preference by similarity to the ideal solution (TOPSIS) is an established DM process. The objective of this report happens to broaden the approach of TOPSIS to solve the DM issues designed with Hesitancy fuzzy data, in which evaluation evidence given by the experts on possible solutions is presents as Hesitancy fuzzy decision matrices, each of which is defined by Hesitancy fuzzy numbers. Findings: we represent analytical results, such as designing a… More >

  • Open Access


    Robust Authentication and Session Key Agreement Protocol for Satellite Communications

    Somayeh Soltani1, Seyed Amin Hosseini Seno1, Juli Rejito2, Rahmat Budiarto3,*

    CMC-Computers, Materials & Continua, Vol.71, No.3, pp. 5891-5910, 2022, DOI:10.32604/cmc.2022.023697

    Abstract Satellite networks are recognized as the most essential communication infrastructures in the world today, which complement land networks and provide valuable services for their users. Extensive coverage and service stability of these networks have increased their popularity. Since eavesdropping and active intrusion in satellite communications are much easier than in terrestrial networks, securing satellite communications is vital. So far, several protocols have been proposed for authentication and key exchange of satellite communications, but none of them fully meet the security requirements. In this paper, we examine one of these protocols and identify its security vulnerabilities. Moreover, we propose a robust… More >

  • Open Access


    Low Profile UHF Antenna Design for Low Earth-Observation CubeSats

    Md. Amanath Ullah1, Touhidul Alam2,3, Ali F. Almutairi4,*, Mohammad Tariqul Islam5

    CMC-Computers, Materials & Continua, Vol.71, No.2, pp. 2533-2542, 2022, DOI:10.32604/cmc.2022.021852

    Abstract This paper reveals a new design of UHF CubeSat antenna based on a modified Planar Inverted F Antenna (PIFA) for CubeSat communication. The design utilizes a CubeSat face as the ground plane. There is a gap of 5 mm beneath the radiating element that facilitates the design providing with space for solar panels. The prototype is fabricated using Aluminum metal sheet and measured. The antenna achieved resonance at 419 MHz. Response of the antenna has been investigated after placing a solar panel. Lossy properties of solar panels made the resonance shift about 20 MHz. This design addresses the frequency shifting… More >

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