Sehrai, Daniyal Ali

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https://academica-e.unavarra.es/handle/2454/50710

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Sehrai

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Daniyal Ali

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Ingeniería Eléctrica, Electrónica y de Comunicación

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0000-0002-1664-8544

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1173187

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813011

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Author: Ali, Tanweer ×

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Now showing 1 - 3 of 3
  • Thumbnail Image
    PublicationOpen Access
    A high gain array based millimeter wave mimo antenna with improved isolation and decorrelated fields
    (IEEE, 2024-06-24) Sehrai, Daniyal Ali; Munir, Mehre E.; Kiani, Saad Hassan; Shoaib, Nosherwan; Algarni, Abeer D.; Elmannai, Hela; Nasralla, Moustafa M.; Ali, Tanweer; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza
    A high gain antenna system with improved isolation for 5G applications is proposed and investigated. The radiating structure consists of a combination of multiple strips to make the proposed design resonate within the desired frequency band of 28 GHz being of major interest for 5G applications. The antenna element provides 684 MHz operating bandwidth and a peak gain of 5.85 dB with a radiation efficiency of 70.9%. Using four antenna elements in an antenna array, connected with a T-shaped feeding network, provides a 12.5 dB peak gain and radiation efficiency of 91.5%. The efficiency improvement of almost 20% is achieved by the reducing transmission co-efficient in feed network elements. This also leads to a low side lobe level (SLL) and an improvement in the bandwidth to 1.53 GHz. Furthermore, the four-port multiple-input-multiple-output (MIMO) configuration is obtained using the proposed array configuration which gives an optimum gain, uncorrelated fields, reasonable bandwidth, and isolation of more than 30 dB with a satisfactory MIMO performance metrics. Due to the abovementioned promising features of presented design, it can be very useful for important 5G services.
  • Thumbnail Image
    PublicationOpen Access
    Decoupling structure for high-bandwidth multiport monopole antennas in K-band and 5G applications
    (Wiley, 2024-12-27) Sehrai, Daniyal Ali; Kiani, Saad Hassan; Ali, Tanweer; Abbasi, Muhammad Inam; Kamarudin, Muhammad Ramlee; Algarni, Abeer D.; Elmannai, Hela; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza
    This paper introduces a multiport monopole antenna featuring high isolation and a broad operating bandwidth, specifically designed for K-band and 5G applications. The proposed antenna configuration comprises four antenna elements assembled to achieve a compact design. A 0.254 mm thick Rogers RT-5880 substrate is used, with an overall size of 24 x 22 mm. Each antenna element is supported by a truncated ground plane, and four symmetrical slots are introduced into the radiating structures. As a result, the proposed multiport antenna covers a frequency band of approximately 18-27 GHz, based on the -10 dB criterion, providing a wide bandwidth of nearly 9 GHz. The separation between the antenna elements is about 4.5 mm. Additionally, a decoupling structure is inserted between the radiating elements to enhance isolation within the desired band, also resulting in a minor improvement in the operating bandwidth. Several performance metrics, including total active reflection coefficient (TARC), diversity gain (DG), envelope correlation coefficient (ECC), and channel capacity loss (CCL), are evaluated and show satisfactory performance within the operating bandwidth. The proposed antenna achieves more than 75% radiation efficiency. The overall performance of the multiport antenna indicates its potential for K-band and 5G applications.
  • Thumbnail Image
    PublicationOpen Access
    Design and characterization of a meandered V-shaped antenna using characteristics mode analysis and its MIMO configuration for future mmWave devices
    (Elsevier, 2024-08-18) Elmannai, Hela; Kiani, Saad Hassan; Shariff, B.G. Parveez; Sehrai, Daniyal Ali; Ali, Tanweer; Rafique, Umair; Algarni, Abeer D.; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza; Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa
    This study presents a novel four-element MIMO antenna system designed for the millimeter-wave (mmWave) spectrum. Each MIMO antenna element features a meandered V-shaped radiating structure fed by a 50Ω microstrip line and a partial ground plane with a square notch printed on a 0.254-mm thick RO5880 substrate. The characteristic mode analysis (CMA) of the antenna is done, which reveals that the antenna efficiently utilizes Mode 2, while Modes 1 and 4 also contribute to the resonance, resulting in a wideband response within the mmWave spectrum. A four-element pattern diversity MIMO configuration is developed to evaluate its suitability for MIMO communication, incorporating a connected ground-structure decoupling network to enhance isolation. The MIMO system achieves over 20 dB isolation between elements, with an impedance bandwidth ranging from 20.2 to 33.05 GHz and a peak gain of 6.6 dBi at 28 GHz. Fabrication and measurement validate the design, showing strong agreement with simulations. The MIMO performance metrics, including envelope correlation coefficient (ECC), diversity gain (DG), mean effective gain (MEG), total active reflection coefficient (TARC), and channel capacity loss (CCL), are within acceptable limits, suggesting that the proposed MIMO antenna system is a promising candidate for future mmWave applications.