An Open-ended Waveguide Slot Antenna with Wide Beam

A coaxially fed open-ended waveguide slot antenna radiating wide beam is proposed. The design is based on a conventional waveguide operating in a TE
₁₀
mode, chamfering at its opening and opening two pairs of oblique slots on the narrow sides of the waveguide to achieve a wide beam of the waveguide. Through optimized design, the antenna provides an impedance bandwidth ( ) of 13.9%, from 7.87 GHz to 9 GHz. At the central frequency 8.1 GHz, half-power beam widths (HPBWs) of 209° and 164° can be achieved for the E-plane and H-plane, respectively. And the peak gain is about 4 dB. Good agreement has been observed between simulated results and measured ones.