Yazar "Mahmood, Khalid" seçeneğine göre listele

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    A high gain MIMO antenna for fixed satellite and radar applications
    (Science and Information Organization, 2018) Altaf, Ahsan; Mahmood, Khalid; Munir, Mehre; Kiani, Saad Hassan
    Patch antennas have emerged rapidly with advancement of communication technology. For antenna design purposes, Finite difference time domain (FDTD) method is a commonly used. This paper focuses on the interaction among elements of MIMO antenna also known as mutual coupling using FDTD method. An M shape is introduced and with placement of isolating structure, round about 12dB of isolation is increased without degradation of performance parameters. The proposed antenna design can be used for radar and satellite services applications.
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    A linear array for short range radio location and application systems
    (Science and Information Organization, 2018) Kiani, Saad Hassan; Mahmood, Khalid; Altaf, Ahsan
    Patch array antennas have primarily been good candidates for higher performance results in communication systems. This paper comprises of linear 1 × 4 patch antenna array study constructed on 1.575mm thick Roggers 5880 substrate with high gain of 12.8dB and focused directivity of 12.9dBi. The array network is fed using T Junction method showing well matched input impedance results. With higher performance parameters and reflection coefficient, voltage standing wave ratio, the proposed antenna array is suited for short range radiolocation and radio services application.
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    Mutual coupling reduction of MIMO antenna for satellite services and radio altimeter applications
    (Science and Information Organization, 2018) Kiani, Saad Hassan; Mahmood, Khalid; Altaf, Ahsan; Cole, Alex J.
    Ground irregularities also known as defected ground structures (DGS) is a freshly presented innovatory way in designing of patch antennas to boost up the performance of antenna constraints. This study presents a novel proposal of ground irregularities or defected ground structure is proposed for suppression of mutual coupling effects among 2x1 multiple input multiple output patch array designed on Roggers Duroid 5880. The two adjacent M shape structures surrounding Dumbbell Shaped structure and sandwiched between Dumbbell shape patterns showed the significant level of surface wave suppression up to -42dB while maintaining the gain of 4.7dB and 5.6dBi of directivity. The patch array operates at 4 to 4.3GHz for Fixed and Radio satellite services (FSS) and (RSS) and radio altimeter application systems.