Realization of a Tapered Slot Array as Both Decoupling and Radiating Structure for 4G/5G Wireless Devices

Abstract

As a combination of microwave Multiple-Input Multiple-Output (MIMO) antenna system and mm-wave antenna array, an integrated design is proposed to provide multi-band, high port isolation, and high gain antenna solution for 4G/5G wireless devices. In this work, an array of tapered slots is used as a decoupling structure at microwave frequency and as an antenna array at mm-wave frequency. The proposed geometry consists of a dual-band monopole MIMO antenna system operating at 4G (2.6 GHz) and 5G (3.5 GHz) sub-6 GHz bands. The wideband port isolation of more than 25 dB is achieved by introducing a tapered slot array structure. One of the key design features is the utilization of these slots as an antenna array with a peak realized gain of 15 dBi at 28 GHz, making this array dual-functional, thus more feasible for compact 4G/5G handheld devices. The proposed design is printed on an RO-5880 substrate with an overall size of 70 mm × 50 mm × 0.51 mm. The measured −10-dB impedance matching bandwidth covers two sub-6 GHz bands (from 2.45 GHz to 2.85 GHz and from 3.18 GHz to 3.68 GHz), and the wide mm-wave band from 25 GHz to 30 GHz. INDEX TERMS Decoupling, MIMO, tapered slot antenna array, 4G/5G.

A Survey: Slot Antenna and Antenna Array.

“…Tapered Slot Array discussed in [5] has both decoupling and radiating structure on the same the surface.For 4G/5G wireless Devices, dual-polarized crossed slot planar array antenna designed in [2] has a very simple configuration, with good radiation performance, can be fabricated easily. Circularly polarized post-wall waveguide slot array antenna in [1], has the reduction the total number of dielectric layers by a value of two, which there by greatly increases ease of mass production.…”

A CPW-Fed Dual-Band Mimo Antenna With Enhanced Isolation for 5g Application

“…ECC has a negative correlation with channel capacity, which means that a large channel capacity reflects a low level of ECC. The approximative expression of ECC for MIMO antenna is calculated as [16]:…”

A Compact Planar Dual-Band Multiple-Input and Multiple-Output Antenna with High Isolation for 5G and 4G Applications

“…In recent years, various MIMO techniques for decoupling and miniaturization have been presented [ 1 , 2 , 3 , 4 , 5 ]. A tapered slot in the ground plane of a MIMO antenna provides both high isolation at microwave band and high gain at millimeter-wave band [ 1 ]. In [ 2 ], a closely coupled dual-band MIMO patch antenna with H-shaped defect ground structures achieves 34.2 dB isolation at 3.7 GHz and 36.3 dB isolation at 4.1 GHz.…”

“…In recent years, various MIMO techniques for decoupling and miniaturization have been presented [1][2][3][4][5]. A tapered slot in the ground plane of a MIMO antenna provides both high isolation at microwave band and high gain at millimeter-wave band [1].…”