PD FPR CP high‐gain MIMO antenna

Abstract

A novel configuration of a Fabry-Perot resonator (FPR) antenna for C band application, which produces a high gain, wider impedance and 3-dB axial ratio bandwidth is presented. Radiation element of the antenna is a square patch coupled with four points of crossed aperture. A feed network can change the rotation of the phase in aperture points and, by this technique, change the polarisation diversity (PD). This antenna is capable of variation circularly PD by changing the input port, also partially of the reflective surface which plays as the role of FPR resonator due to the structure and arrangement of cells capable of changing the PD. Experimental results clarify that the FPR antenna covers the impedance bandwidth of 4-6 for S11 ≤ −10 dB. Furthermore, the proposed antenna approximately has a constant gain from 4.4-7.5 GHz with a peak value of 18.1 dBic for each of the input ports. The antenna covers 3 dB axial-ratio bandwidth, between 4.35-7.85 GHz.

Circularly Polarized MIMO Antenna Using F-Shaped Mirrored Structure

“…line of sight (LOS, point to point)& multipath (broadcast)in both cases are investigated by camparison of diversity gain, channel capacity and ECC.For increasing radiation interaction antennas should be closely packet and coupled each other. some techniques to reduce mutual coupling are microstrip stubs [5],defected ground structure [DGS] [6], [7], electromagnetic band gap EBG [8], [9], parasitic elements [10],shorting pin [11], [12], etc.Few CP MIMO antennas are reported as high gain [13], [14], planar [15], [16] wideband [17], [18]applications.Simple feeding are used in dielectric substrate with polarization diversity. For planar applications 3D construction are not used.…”

Circularly polarized beam steering array antenna fed by low magnitude and phase error response of Butler matrix to use pattern stabilization applications

“…Previous researches have major problem such as the complexities of the feeding network. [3][4][5][6][7][8][9][10][11][12][13][14][15][16] While the main purpose is to introduce a simple structure to access the desired radiation properties. Nevertheless, every change in configuration improves some features while sacrificing others.…”

Isolation Enhancement of Closely Packed Dual Circularly Polarized MIMO Antenna Using Hybrid Technique

“…These techniques are mostly reported to reduce mutual coupling of LP antennas but the impact of these techniques on the axial ratio (AR) of the CP antenna has been rarely discussed. Certainly, some CP MIMO antennas have been reported for high gain [13], [14], wideband [15]- [17] and planar [18]- [20] applications. Similar decoupling techniques are adopted, such as power dividers [13], DGS [14], and parasitic elements [16], [17].…”

“…Certainly, some CP MIMO antennas have been reported for high gain [13], [14], wideband [15]- [17] and planar [18]- [20] applications. Similar decoupling techniques are adopted, such as power dividers [13], DGS [14], and parasitic elements [16], [17]. However, designs in [13], [19] suffered from the complex feeding networks for circular polarization at the expense of occupying a large area.…”

“…Similar decoupling techniques are adopted, such as power dividers [13], DGS [14], and parasitic elements [16], [17]. However, designs in [13], [19] suffered from the complex feeding networks for circular polarization at the expense of occupying a large area. The wideband CP MIMO antennas reported in [16], [17] required simpler feeding structures but incorporated with a very large edgeto-edge spacing of over 0.3λ, making them less appealing for compact applications.…”