Quarter cylindrical dielectric resonator antenna with circular polarisation for wideband MIMO systems

Abstract

In this Letter, a quarter cylindrical dielectric resonator antenna (Q-CDRA) with a low profile and circular polarisation (CP) is presented for wideband and multiple-input-multiple-output (MIMO) systems. The approach used to obtain a reduced wideband CP antenna is realised by deforming the geometry of the CDR to a quarter cylinder and using a quasi-spiral feedline to excite two resonant modes in phase quadrature (HEM 11 and HEM 12). The proposed design exhibits a wide-impedance bandwidth (BW) of 34% (4.4-6.2 GHz) with a low measured coupling level<−15 dB, and an axial ratio BW of 24.4% (4.5-5.75 GHz). The antenna gain is stable through the operating BW with a gain peak of 6.4 dBi. In addition, the antenna has a low cross-polarisation in the boresight direction with low envelope correlation coefficient<0.03. The presented design is suitable for RHCP WLAN applications.

Enhanced isolation of MIMO cavity antenna using substrate integrated waveguide technology

“…To improve the channel capacity and spectral efficiency multi-input multi-output (MIMO) systems have been introduced, which brought as well the advantage of reducing significantly the effects of interference across multiple paths. [12][13][14] The difficult task that antenna designers generally face is to design a compact MIMO antenna system with good diversity performance. Usually, for integrated MIMO antennas, it is necessary to make a trade-off between the element spacing and the isolation between the antenna ports.…”

Dual port spiral shaped dielectric resonator MIMO antenna with orthogonal modes for wideband application

“…It offers several features such as high isolation, wide bandwidth, high efficiency and high gain 3,4 . Significant researches have explored many dielectric resonator MIMO antenna designing techniques for various wireless applications 5–20 . First Dielectric resonator with MIMO antenna was presented in Reference 5 which achieved 10 dB diversity gain.…”

“…In order to improve performance of MIMO, various multiple DRA configuration are reported 15–24 . Two element mushroom shaped MIMO DRA is investigated for wideband application 15 .…”

“…In Reference 18, self‐complementary ring incorporated in DRA to achieve MIMO wideband application is explored. For a wideband application, two element quarter cylindrical DRA with quasi spiral feedline is used to generate hybrid modes 19 . For achieving pattern diversity in Reference 20, compact four port MIMO DRA is investigated.…”

Patches of Dual Functions for Wideband MIMO Array Antenna with Linear or Circular Polarization Characteristics

“…In the last decade, few of multi-port MIMO antennas have been proposed with end-fire radiation and circular polarization (CP) characteristics [28][29][30][31][32] . In 29 , not Yagi-Uda design with four MIMO antenna units rotated around a circle was non-planar; thus, it is unsuitable for printed circuit (PCB) technology.…”