Wideband Array Antenna with Single-Layer Feeding Network at Ka-band

This work presents a wideband slot array antenna with a single-layer feeding network at Ka-band for the fixed wireless communication system. To improve the bandwidth, the circular arm dipole slot is used as the radiating element, fed by open-ended rectangular waveguides. Then, a combination of the ridged waveguide and the hollow waveguide is implemented to realize the corresponding one-to-one excitation between the output ports of the feeding network and the radiation slots. The 4 by 4 slot array antenna achieves a wide bandwidth of 34.3% with a reflection coefficient above 14dB, reasonably good radiation patterns, and a total efficiency of over 90%.