Low-Profile Broadband Circularly Polarized Patch Antenna Using Metasurface

A Bandwidth-Enhanced, Compact, Single-Feed, Low-Profile, Multilayered, Circularly Polarized Patch Antenna

“…Several additional antenna-height designs are included that were obtained and optimized with our strategy in order to make these comparisons fair. It is clearly observed that our antennas have wider AR bandwidths than most of the referenced comparison antennas of the same height [5][6][7][8][9][10][11][12]18]. One exception is the approach in which parasitic patches are added around the main radiating patch on the same layer [13,14].…”

“…This aspect severely limits their widespread application [1][2][3][4]. A popular and effective method to improve their AR bandwidths is to introduce additional parasitic patches [5][6][7][8][9][10][11][12][13][14]. Unfortunately, their presence also has some inescapable drawbacks.…”

“…Unfortunately, their presence also has some inescapable drawbacks. For instance, vertically stacking one or more parasitic patches with similar configurations has the desired effects, but it also significantly increases the antenna's total height [5][6][7][8][9][10][11][12][13]. On the other hand, adding parasitic patches around the main radiating patch on the same layer requires much more area than the main patch [13,14].…”

“…At the same time it improves the performance of the original pair of near-degenerate modes from the corner-cuts of that patch. It will be shown that by introducing both circular slots and meander-line slots on these patches, three pairs of adjacent near-degenerate modes with the same clockwise polarization successfully combine to produce twice the CP bandwidth when compared to conventional patch antennas of the same height [5][6][7][8][9][10][11][12][13][14] without sacrificing the compact size advantages. Simulation results are compared with the measurements of a fabricated prototype; very good agreement is demonstrated.…”

Design of Wideband, Circularly Polarized Patch Antennas for Rfid Applications in the FCC/Etsi Uhf Bands

“…One approach to enhance both types of bandwidth is through use of thick substrates [10], which tend to support strong surface waves, and consequently, diffraction by the edges of the ground plane resulting in strong back radiation. Other approaches include use of shorting pins or alternative feeding mechanisms [4,11,12], parasitic elements [13][14][15], or even metasurfaces [16].…”