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1887

access icon free Shared radiator MIMO antenna for broadband applications

© The Institution of Engineering and Technology
Received 28/04/2017, Accepted 17/01/2018, Revised 27/12/2017, Published 19/01/2018

In this study, a new compact broadband two-port multiple-input–multiple-output (MIMO) antenna using shared radiator is proposed. The radiator making an angle of 135° from X-axis is symmetrically shared by two tapered microstrip feed lines in orthogonal polarisations. The shared radiator MIMO antenna is more compact as compared with conventional MIMO antenna which uses separate radiator for each port. The proposed antenna is designed on low-cost FR4 substrate (dielectric constant = 4.4, and loss tangent = 0.02) of size 39 × 39 mm2 and provides a bandwidth of 136.63% (2.4–12.75 GHz) with reflection coefficients, S 11/S 22 less than or equal to −10 dB and values of mutual coupling between antenna ports S 21/S 12 less than or equal to −15 dB. Through the utilisation of end-loaded meandered line stub attached to modified curved ground plane, low mutual coupling between antenna ports is achieved. The simulated results for input and radiation characteristics of the proposed MIMO antenna are compared with corresponding experimental results.

Inspec keywords: microwave antenna arrays; UHF antennas; antenna radiation patterns; electromagnetic wave polarisation; microstrip lines; permittivity; broadband antennas; MIMO communication; antenna feeds; electromagnetic wave reflection

Other keywords: modified curved ground plane; radiation characteristics; dielectric constant; antenna ports; broadband application; low-cost FR4 substrate; shared radiator MIMO antenna; compact broadband two-port MIMO antenna; reflection coefficients; end-loaded meandered line stub; compact broadband two-port multiple-input-multiple-output antenna; orthogonal polarisations; tapered microstrip feed lines; loss tangent; mutual coupling values; frequency 2.4 GHz to 12.7 GHz

Subjects: Antenna arrays; Waveguides and microwave transmission lines; Antenna accessories; Dielectric materials and properties

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