Dynamically Switched Dual-Band Dual-Polarized Dual-Sense Low-Profile Compact Slot Circularly Polarized Antenna Assisted With High Gain Reflector for Sub-6 GHZ and X-Band Applications

A Compact Circularly Polarized Rotated L-Shaped Antenna With J-Shaped Defected Ground Strucutre for Wlan and V2x Applications

“…The CP radiation and high radiating performance antennas with their favorable features such as low profile, light weight, and planner structure are very essential for modern wireless communication including Industrial Internet of Things (IIoT), machine to machine communication in aerospace, security, commercial, agricultural as well as V2X applications [1,2]. In this context, several antenna designers and researchers have reported outstanding CP/dual CP antennas to meet the growing demand for broad bandwidth and multimedia applications in the near future [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Among them, slots with various geometries of the radiating element are gaining more attention [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] as they can be utilized to generate CP radiations easily for desired wireless bands.…”

“…In this context, several antenna designers and researchers have reported outstanding CP/dual CP antennas to meet the growing demand for broad bandwidth and multimedia applications in the near future [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Among them, slots with various geometries of the radiating element are gaining more attention [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] as they can be utilized to generate CP radiations easily for desired wireless bands.…”

“…However, the antennas in [8][9][10][11] have demonstrated a very narrow ZBW and do not cover the entire band of operation. Wideband antennas designed on cost-effective FR-4 substrate have been reported in [12][13][14][15][16]. The square slot CP antenna in [12] has a ZBW of 36.41% (4.65-6.72 GHz), and the perturbation patch antenna with open slot [13] has shown a very wide ZBW of 103.5% (2.40-7.55 GHz).…”

“…Notably, the inverted L-shaped CP antenna design in [14] has demonstrated a wide ZBW of 50.9% (3.48-5.86 GHz) for C-band application, and the CP microstrip dual-band antenna (with L-shaped radiator and two circular strips) studied in [15] has also shown wide ZBWs of 46.4% (1.82-2.92) and 40.5% . Nonetheless, to cover both Sub-6 GHz and X-band applications, [16] has reported a uniplanar slot antenna with a loaded metallic reflector at the bottom, and dual broadband ZBWs of 21.27% (5.46-6.76 GHz) and 24.65% (8.18-10.48 GHz) were achieved. Even though the antennas in [12][13][14][15][16] have also achieved wide ZBWs, they do not have matching overlapping ARBW.…”

“…Nonetheless, to cover both Sub-6 GHz and X-band applications, [16] has reported a uniplanar slot antenna with a loaded metallic reflector at the bottom, and dual broadband ZBWs of 21.27% (5.46-6.76 GHz) and 24.65% (8.18-10.48 GHz) were achieved. Even though the antennas in [12][13][14][15][16] have also achieved wide ZBWs, they do not have matching overlapping ARBW. A frequency tunable dual folded inverted-L CP antenna [17] and CP V-shaped slot antenna [18] with overlapping 3-dB ARBW and 10-dB ZBW have been investigated recently; however, the use of diodes and vias in [17] and [18], respectively, have increased their manufacturing complexity.…”