Low-Profile Orthogonally Tripolarized Antennas

Abstract

A low-profile orthogonally linearly tripolarized antenna consisting of two thick-slot antennas and one half-mode substrate integrated waveguide (HMSIW) antenna has been investigated. The two thick-slot antennas radiate -and -directional linearly polarized waves, while the HMSIW antenna contributes to the -directional polarized wave. The low-profile geometry is achieved by utilizing the HMSIW antenna. Isolations between the three antennas measured are lower than 20 dB, which means that the proposed antenna geometry provides good diversity gain and the channel capacity can be increased by as much as three times.Index Terms-Mobile antennas, multiple-input-multiple-output (MIMO) systems, mutual coupling, polarization diversity.

Fifth Generation Antennas: A Comprehensive Review of Design and Performance Enhancement Techniques

“…Further, the parametric analysis shows that the ECC value is below 0.5 within the frequency range of 2.50 -4.20 GHz and gain is greater than 1.5 dBi. Next, to enhance data throughput and radiation efficiency many researchers have designed Monopolar Patch Antennas (MPAs) that generates monopole radiation pattern [108]- [113]. In [98] MPAs are combined in Y type structure for MIMO operation with an efficiency of 88% and ECC around 0.1.…”

Bandwidth and gain enhancement of triple‐band MIMO antenna incorporating metasurface‐based reflector for WLAN/WiMAX applications

“…Due to higher mutual coupling between single antenna elements, some of the power between the individual antenna elements gets wasted [5]. There are different methods to lower down the mutual coupling in MIMO antennas such as DGS loadings [6], neutralisation lines [7, 8], split‐ring resonator loadings [9, 10], parasitic configuration loading [11], antennas with multilayer configurations [12, 13], frequency selective surfaces [14, 15], electromagnetic bandgap structures [16], and substrate integrated waveguide [17]. Also, the gain and bandwidth of the MIMO antennas are enhanced by artificial magnetic conductor loadings [18, 19], Fabry Perot metamaterial (MTM) superstrates [20], multilayer metasurface (MS)‐based superstrate [21], MTM inspired hexagonal ring based superstrate [22], epsilon and Mu near to zero MTM superstrates [23], MTM‐based superstrate [24], crossed‐dipole antenna with a small frequency separation ratio applicable for MIMO systems [25], crossed dual‐polarised and dual‐band bowtie dipole antenna combined with an AMC‐based reflector [26], dual‐band MIMO slot antenna with dual‐band AMC loadings [27], and dual‐band MIMO based four‐port array antenna with filtering structures [28].…”

Miniature tri‐polarized MIMO slit‐postwall step impedance resonator slot antenna array

“…In Reference 14, the proposed tri‐polarized slot antenna operating at 2.44 GHz consists of a quasi‐cross‐shaped slot with two orthogonal TM 11 modes and an annular slot with TM 01 mode. However, the antennas in References 12 and 13 both contain substrates over 6 mm thick because of the SIW, and the antenna in Reference 14 has a ground plane with 120 mm × 120 mm as well as four straight slots with 33 mm.…”

“…Based on slot antenna, the researches of dualpolarized antenna have been mature, and most structures place two radiation slots vertically. [8][9][10][11] Tri-polarized slot antenna is fewer, even some of which, are the combination of two vertical slot and other form, such as a HMSIW antenna, 12 or a QMSIW antenna. 13 In Reference 14, the proposed tri-polarized slot antenna operating at 2.44 GHz consists of a quasi-cross-shaped slot with two orthogonal TM 11 modes and an annular slot with TM 01 mode.…”