A Wideband Circularly Polarized Patch Antenna for 60 GHz Wireless Communications
Demands of modern communication and sensor systems for more bandwidth, higher resolution and compactness lead to operating frequency up to the millimeter wave (mmWave, f > 30 GHz) or even sub-mmWave regime. In this paper, the authors present the design of a fully packaged 60 GHz wideband patch antenna incorporating an air cavity and a fused silica superstrate. Circular Polarization (CP) is realized by introducing a diagonal slot at the center of the square patch. By optimizing the patch and the slot dimensions, a high efficiency (>90%) microstrip fed CP antenna with an impedance bandwidth of 24% and a 6 dB axial ratio bandwidth of 21.5% is designed.