A 2 x 2 Array Antenna with Circular Polarization and Conical Beam Radiation

作者：Sim C Y D^*; Han T Y; Chi C J; Chen B Y

来源：International Journal of RF and Microwave Computer-Aided Engineering, 2014, 24(2): 223-228.

DOI：10.1002/mmce.20752

• array antenna
• conical beam
• circular polarization
• L-shaped probe
• corporate feed

A circular disk patch antenna loaded with a hemi-circular slot is initially proposed for achieving circular polarization (CP). To exhibit broad CP bandwidth that can cover the WLAN 2.4 GHz operating band, the patch antenna is fed by an L-shaped probe. To further attain conical beam radiation with peak gain of approximate to 8 dBic at +/- 30 degrees theta angle (), a 2 x 2 array type is proposed in this study, in which four circular disk patch array elements are arranged in a sequentially rotated fashion via a corporate feed network. Here, desirable 3-dB axial ratio (AR) bandwidth and 10-dB impedance bandwidth of approximate to 5% and 21% were measured.