Circularly Polarized Broadband Antenna With Circular Slot on Circular Groundplane

Abstract

Abstract-A novel circularly polarized antenna with a circular radiating aperture and circular ground plane for broadband characteristics is presented in this paper. The vertical and horizontal components of the L-shaped probe are separated and placed at the front and back sides of the substrate. The antenna is excited by a microstrip line which is connected to the vertical component of the L-shaped probe and electromagnetically couples the signal to the horizontal component of the L-shaped probe. The concept of placing an appropriate stub in the slot, by observing the electric field vector behaviour in the slot, is proposed to enhance the axial ratio (AR) bandwidth by around 15%. The fabricated antenna shows wideband impedance and circular polarization characteristics of 48% along with a maximum gain of 6 dBic. The measured and simulated antenna characteristics are in good agreement.

Broadband CPW-Fed Circularly Polarized Antenna With an Irregular Slot for 2.45 GHZ Rfid Reader

“…In recent years, various antennas are investigated to achieve circular polarization. Because of the advantages of low profile, design simplicity and robustness, many CP antennas are designed with slots [1][2][3][4][5][6][7][8][9][10][11][12][13]. Slotrings [3][4][5][6], square slot [7][8][9][10][11], and U-shaped slot [12,13] are effective methods to achieve circular polarization.…”

A Wideband Twin-Diamond-Shaped Circularly Polarized Patch Antenna With Gap-Coupled Feed

“…Besides that, a suspended patch antenna with indented edge and gap-coupled feed has been presented to realise circular polarization [11]. A proper feed network has become a major challenge for wideband CP antennas [12][13][14][15][16][17][18][19][20].…”

A Wideband Planar Monopole Antenna Array With Circular Polarized and Band-Notched Characteristics

“…Conventional CP antenna is achieved by trimming opposite corners of the patch corners [10,11], inserting the thin slots on patch [12][13][14][15][16][17][18][19], fed by coplanar waveguide [20]. In these cases, due to the narrow 3 dB axial ratio, it is not possible for the practical use.…”