A compact dual-square-ring-shaped slot antenna using a microstrip feed line is proposed for wideband circularly polarized (CP) radiation. The antenna consists of a combined dual-square-ring-shaped slot along the diagonal direction and a microstrip feed-line along with stub in the orthogonal direction. The slot and feeding structures are fabricated on the opposite planes of a low cost FR4 substrate. The stub width and a dual-square-ring-shaped slot are optimized for wideband CP radiation with good impedance matching. The measured 3-dB axial ratio and 10-dB return loss bandwidths of the proposed antenna are 47% (2.1-3.4 GHz) and 75% (1.92-4.25 GHz), respectively. The measured gain is more than 2.0 dBic over the 3-dB axial ratio bandwidth.
|Number of pages||5|
|Journal||Microwave and Optical Technology Letters|
|Publication status||Published - Nov 2014|
- circular polarization
- circularly polarized antenna
- microstrip feed-line
- slot antenna