High gain frequency scanning antenna using dumbbell‐shaped inclined slots and parallel plate waveguide polariser

A high gain vertically polarised travelling-wave frequency scanning array antenna fed by a meander rectangular waveguide is presented for Ku-band operation. The proposed used in radar demonstrator setup to detect and monitor birds direct proximity the wind farms. goal prevent collisions of with consists 34 inclined dumbbell-shaped radiating slots integrated parallel-plate waveguide. meandered feeding structure enlarge beam angle range over frequency. are employed narrow wall due space restriction meandering. as polarisation filter reduce cross-polarisation level owing inclination slots. An E-plane horn beamwidth elevation plane. overall size 20.6λ length 15λ width, where λ free wavelength at 15.55 GHz. operates from 15.40 15.70 half power about 4° azimuth plane 20° main steers cover 39° angular Taylor distribution applied achieve sidelobe below −25 dB same 26 dBi operating range. fabricated measured successfully verify approach. shows an impedance matching significantly better than 10 higher 25 throughout its