Abstract-Multiple-input and multiple-output (MIMO) is currently regarded as key technology for long term evolution (LTE) but a critical effect is mutual coupling (S 21 ) due to space constraint in miniaturized design. A compact-size antenna with low mutual coupling would be an ideal choice for better system performance. This paper describes the design of a small-size (48×48 mm 2 ) MIMO antenna system with low mutual coupling for LTE 800 MHz applications. The antenna system comprises of two FR-4 substrate layers; one printed with two meander line antennas (MLAs), the other printed with reactive impedance surface (RIS) and defected ground structure (DGS). The properties of the antenna like S-Parameters, excited surface current distribution, far-field radiation pattern and diversity performance characteristics were studied. The results indicated that MLAs rendered compactness to the system. Introduction of air gap (AG) between the two substrates, DGS and periodic square patches of RIS resulted in 452 MHz bandwidth and mutual coupling of −41.18 dB between antenna elements. The performance of the proposed design compared with other reported geometry has been demonstrated. Parameters including bandwidth, ratio of antenna area/improvement in S 21 , antenna efficiency and the envelope correlation coefficient were compared. Considering the results, the present system appears to be comparatively more efficient.
Recently, advancement in wearable technologies, one challenging improvement is textile antenna. The most requirements of textile antennas are dielectric materials which include fabric substrate and the structure of the antenna. The characteristics of the antenna depends on the substrate material. The dielectric value of the fabric material can be calculated from the operating frequency of patch antenna. In this paper the micro strip patch antenna is designed for ISM band applications. The main objective of this paper is to design and compare the performance of the micro strip patch antenna on different fixed and flexible dielectric material like FR-4, RT DUROID 6010, Polystyrene, Teflon, Quartz, Cotton, Alumina, Polyester with different constant in terms of gain, return loss, radiation patterns The proposed antenna operate at the resonant frequency 2.45GHz(ISM band) with low return loss and high gain and directivity.The size of the designed antenna has been also miniaturized.
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