Collocated MIMO travelling wave SIW slot array antennas for millimetre waves

Abstract

A novel four-element collocated travelling wave substrate integrated waveguide (SIW) multiple-input multiple-output (MIMO) antenna covering millimetre wave (mm-wave) bands (28-32 GHz) is presented. The antenna exhibits a matching bandwidth of more than 4 GHz and a measured gain of 15 dBi. The MIMO antenna elements are collocated, thus significantly reducing the size of the proposed design. To spatially isolate the beams (obtain lower correlation coefficient) of the MIMO antenna elements, the beams are oriented in different directions. The slots within each SIW array are designed to provide tilted beams, thus eliminating the need for a beam switching network. Four distinct beams are formed towards ±10°and ±30°. The dimension of the four-element MIMO SIW design is 68 � 30.68 � 0.5 mm 3 . The proposed antenna has a high gain, compact size, simpler feeding and enhanced MIMO capability compared to other SIW antennas proposed in the literature.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

A Compact, Circularly-Polarized, Substrate-Integrated Waveguide, Millimeter-Wave Beamsteering System for 5G Mobile Terminals

“…Unfortunately, these arrays do not incorporate a beamsteering mechanism and thus cannot be implemented in mobile terminals yet. These arrays are in contrast to surface-emitting arrays (such as that presented in [14], which is additionally also not CP and also does not demonstrate continuous beamsteering capabilities). There are, however, several beamsteering arrays that share some or all of this paper's goals (compact form factor, circular polarization and continuous beamsteering) [21]- [26].…”

“…While large beamsteering mmWave CP systems are not difficult to implement at base stations, such solutions in mobile terminals present several limitations including power, space, compatibility with standard printed circuit board (PCB) processes, and detrimental effects of the user's hand and head on the radiation. Compatibility with standard PCB processes can be achieved through designing a fully substrate-integrated waveguide (SIW) system, with benefits such as easy manufacturing and low loss [10]- [14]. To mitigate the effects of the user on radiation patterns, one solution can be to place antenna arrays, with end-fire radiation pattern, on the edges of a mobile terminal [15], [16].…”

A low sidelobe 77 GHz centre‐fed microstrip patch array antenna

“…However, their large volume makes them less suitable for practical engineering applications. Substrate integrated waveguide slot array antennas have a low profile and high gain [7][8][9][10]. However, their bandwidths become narrow when the number of radiation slots increases.…”