Single‐feed microstrip antenna for wide angle circular polarisation with six metal columns

Abstract

A circularly polarised microstrip antenna with a wide beamwidth and wide axial ratio (AR) beamwidth is presented. The antenna is mainly composed of a dielectric substrate, a single‐feed patch, a reduced ground, and six metal columns. The reduced ground and six metal columns are primarily used to broaden the radiation beamwidth and improve the AR performance of the wide angle. According to the measured results, the antenna achieves a bandwidth of 3.78% from 7.78 to 8.08 GHz with an AR <3 dB, and an impedance bandwidth of 10.3% from 7.65 to 8.43 GHz with a return loss (RL) >10 dB. In addition, half‐power beamwidth of 211° × 209° and 3 dB AR beamwidth of 222° × 239° at 8.0 GHz are observed. The antenna is a single‐feed type with a simple structure and no additional feed network, which can be extended to some wide beamwidth and wide AR beamwidth applications in the X‐band, even higher than the Ku‐band.

A novel sequential‐phase quad‐feed circularly polarized microstrip antenna for INMARSAT and GPS applications

“…Generally, a single‐feed microstrip antenna has a simple and compact structure but narrow impedance and axial ratio (AR) bandwidths. So some new structures have been designed to broaden the impedance and AR bandwidths, including the use of capacitive‐coupled feed with parasitic strips, 4 reduced ground with six metal columns, 5 stacked patch antenna with two L‐shaped stubs 6 and SIW cavity‐backed antenna with a modified triangular‐ring‐slot 7 . It is worth mentioning that a multifeed microstrip antenna can obtain a wide bandwidth and good CP performance.…”

Circular polarized patch antenna with wide 3‐dB axial ratio beamwidth and suppressed backward cross‐polarized radiation for high‐precision marine navigation applications

“…In [13], two pairs of narrow slots are inserted along the diagonal lines of a square patch for a wide 3-dB ARBW. In [14], the CP microstrip antenna with six metal columns is presented for wide-angle circular polarization. However, they all show narrow CP bandwidth (0.4% in [13] and 3.7% in [14]) which limits their applications.…”

“…In [14], the CP microstrip antenna with six metal columns is presented for wide-angle circular polarization. However, they all show narrow CP bandwidth (0.4% in [13] and 3.7% in [14]) which limits their applications.…”