Yazar "Abbas, Syed Muzahir" seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • Küçük Resim Yok
    Öğe
    Circular ring fractal UWB antenna for microwave imaging applications
    (Institute of Electrical and Electronics Engineers Inc., 2023) Rafique, Umair; Agarwal, Shobit; Abbas, Syed Muzahir; Dalal, Priyanka; Ullah, Raza; Kiani, Saad Hassan
    In this work, an ultra-wideband (UWB) planar antenna design is presented that is suitable for microwave imaging applications. The radiating element is comprised of three connected rings connected through thin metallic strips that correspond to fractal geometry. The antenna's bottom side utilizes a stair-shaped slot-based partial ground plane to achieve UWB response. The use of a stair-shaped slot also helps in achieving good impedance matching in the UWB frequency range. The proposed antenna design exhibits a total dimension of 18×20 mm2. An impedance bandwidth of ?31.68 GHz is observed within the frequency range of 3.32 GHz ? to beyond 35 GHz. Furthermore, the proposed UWB antenna shows a fractional bandwidth (FBW) of 165.35% and a peak gain of ?8.5 dBi within the desired operating range. It is evident from the results that the proposed antenna exhibits exceptional low-dispersive characteristics across a broad frequency spectrum, which makes it highly suitable for microwave imaging applications.
  • Küçük Resim Yok
    Öğe
    Tri-band MIMO diversity antenna for modern smartphones
    (Institute of Electrical and Electronics Engineers Inc., 2023) Kiani, Saad Hassan; Savcı, Hüseyin Şerif; Rafique, Umair; Parchin, Naser Ojaroudi; Dalal, Priyanka; Abbas, Syed Muzahir
    This paper proposes the design of a MIMO antenna system with four elements, specifically tailored for future smartphones. The MIMO antenna system is operating in three important 5G frequency bands: 3.5 GHz, 4.7 GHz, and 5.8 GHz. The MIMO system utilizes a single hybrid H-shaped patch radiator as the radiating element, which is integrated into the smartphone's side-edge frame. The main board of the device consists of the feeding lines. By employing this configuration, the antenna achieves a tri-band response, satisfying the -6 dB impedance bandwidth criteria for each desired frequency band, providing bandwidths of 680 MHz, 440 MHz, and 470 MHz, respectively. The MIMO antenna system also demonstrates notable performance characteristics, including a peak gain of 5.8 dBi, a radiation efficiency of 70%, and a total efficiency of 80%. The strategic placement of antenna elements at the corners of the side-edge frames ensures isolation of greater than 16 dB between the elements in the relevant frequency bands. Furthermore, this antenna design facilitates both spatial and pattern diversity, enhancing the overall performance of the MIMO system.
  • Küçük Resim
    Öğe
    Ultra-wideband fractal ring antenna for biomedical applications
    (Hindawi Limited, 2023) Saleem, İlyas; Rafique, Umair; Agarwal, Shobit; Savcı, Hüseyin Şerif; Abbas, Syed Muzahir; Mukhopadhyay, Subhas
    In this paper, an efficient, coplanar waveguide (CPW)-fed printed circular ring fractal ultra-wideband (UWB) antenna is presented for biomedical applications. In UWB technology, short-range wireless communication is possible with low transceiving power, a characteristic that is particularly advantageous in the context of microwave and millimeter-wave (mmWave) medical imaging. In the proposed antenna configuration, the UWB response is achieved by introducing wedged slots in the radiating patch, designed on a low-loss substrate. A CPW partial ground plane is truncated from the edges to optimize the antenna impedance. Experimental results indicate the antenna's robust performance across the frequency range of 3.2-20 GHz. The well-matched measured and simulated results confirm our contribution's employability. Furthermore, a time-domain study offers valuable insights into how the antenna responds to transient signals, highlighting its responsiveness and adaptability to biomedical applications.
  • Küçük Resim
    Öğe
    Ultra-wideband pentagonal fractal antenna with stable radiation characteristics for microwave imaging applications
    (MDPI, 2022) Khan, Muhammad Abbas; Rafique, Umair; Savcı, Hüseyin Şerif; Nordin, Anis Nurashikin; Kiani, Saad Hassan; Abbas, Syed Muzahir
    For microwave imaging applications, a design for an ultra-wideband (UWB) fractal antenna is presented. The antenna design is composed of a pentagonal fractal patch radiator fed by a modified co-planar waveguide (CPW) ground plane. It is built on a low-loss Rogers RT/Duroid 5880 dielectric substrate with a dimensions of 24 × 30 × 0.787 mm3. According to the measurements, the designed antenna offers a fractional bandwidth of 123.56% ranging from 3 GHz to 12.7 GHz. In addition, a maximum gain of 3.6 dBi is achieved at 8.5 GHz. From the results, it is also observed that the proposed antenna structure attains constant radiation characteristics in the operating bandwidth, which is useful for microwave imaging applications. The time domain analysis of the proposed design is also performed, and it is observed that the designed antenna offers a group delay of ? 1.5 ns, which ensures minimum pulse distortion.