In this article, a dual sense dual port circularly polarized cylindrical dielectric resonator antenna (CDRA) is discussed for multiple input multiple output (MIMO) applications. Three exclusive features of the proposed radiator are (i) modified circule‐shaped aperture generates circular polarization for both the ports; (ii) proposed structure can generate left‐hand circular polarization (LHCP) and right‐hand circular polarization (RHCP) that depends on feed port selection; (iii) by introducing the concept of polarization diversity (LHCP/RHCP) and defected ground structure (DGS) between the two radiator, isolation is improved. A prototype of proposed radiator is fabricated and experimentally tested to authenticate the simulated results. The fractional impedance bandwidth for port 1 and port 2 is 15.1% and 14.9%, respectively. Within the targeted operating band, the isolation is better than −25 dB between the ports. Different diversity performance parameters are also calculated and they are also lie within their optimum limit. The proposed MIMO antenna is suitable for WLAN (5.5/5.8 GHz) applications.

This communication explains the designing of two-port based hybrid radiator for multiple-input-multiple-output (MIMO) applications. Hybrid radiator includes U-shaped printed line and ring dielectric resonator antenna (ri-DRA). Wideband characteristics have been achieved by exciting both the U-shaped printed line along with ri-DRA. The U-shaped metallic line acts as a magnetic dipole and helps to excite fundamental hybrid mode (HE 11δ ) in the ri-DRA. Dual L-shaped and a rectangular defect have been created in ground plane for achieving wideband isolation over the working frequency band. Optimized Scattering parameters and far-field results are verified by fabricating and testing of antenna prototype. Experimental outcomes confirm that the proposed MIMO antenna gives wider impedance bandwidth (80%), improved port isolation (better than 18 dB), stable gain (~4 dB), and radiation pattern. Various MIMO performance factors are analyzed and instituted in the tolerable boundaries. K E Y W O R D S diversity performance, MIMO antenna, ring DRA, wideband

In this communication, triple band hybrid multi-input-multi-output (MIMO) cylindrical dielectric resonator antenna (CDRA) with high isolation is examined. The proposed MIMO antenna includes two symmetric folded microstrip line feeding structures along with CDRA at two different ends of substrate. Two inverted L-shaped strips on the ground plane are used to enhance the isolation (S 12 < 215 dB) as well as to generates 2.7 GHz frequency band. Metallic strip on the ground plane act as an electromagnetic reflector and also enhance the isolation between two antennas (S 12 < 220 dB). Archetype of proposed MIMO antenna design has been fabricated and tested to validate the simulated results. The proposed antenna operates at three different frequency bands 2.24-2.38 GHz, 2.5-3.26 GHz, and 4.88-7.0 GHz (S 11 < 26 dB) with the fractional bandwidth 6.06%, 26.4%, and 35.7%, respectively. Folded microstrip lines generate k 4 path delay between the electric field lines and originate circular polarization characteristics in the frequency range 5.55-5.75 GHz with the fractional bandwidth of 3.55%. In order to satisfy the different performance requirement of MIMO antenna such as envelop correlation coefficient, mean effective gain, effective diversity gain, peak gain are also examined. The proposed antenna is found suitable for LTE2500, WLAN, and WiMAX applications. V C 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:763-772, 2016.

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In this article, a dual port aperture coupled MIMO cylindrical dielectric resonator antenna with enhanced isolation is proposed. Dual feeding techniques are used to excite dielectric resonator. These feeding structures are oriented in such a way so that they can produce orthogonal mode in the dielectric resonator. High isolation is observed by generating two orthogonal modes, that is, HE11δy and HE11δx in the dielectric resonator. The fractional bandwidth for port 1 and port 2 is 17.8% (3.1‐3.68 GHz) and 18.4% (3.1‐3.7 GHz), respectively, and isolation between the two ports exceeds −25 dB within the required band. The proposed antenna is simulated, fabricated, and experimentally tested. Good agreements between measured and simulated results are observed. The various diversity performance parameters are also lie within their acceptable limits. Based on presented results, it can be concluded that the presented MIMO antenna is suitable for WiMAX (3.3‐3.6 GHz) applications.