Low sidelobe slotted waveguide antenna array of X-band radar system

Two X-band low sidelobe slotted waveguide antenna arrays are designed and tested. The excitation amplitude of aperture unit is based on the Taylor distribution. Using the Stevenson equivalent circuit method, aperture offset is calculated with different excitation amplitude distributions. With a resonant length extraction model of multiple cracks, the aperture resonance length is calculated in mutual coupling environment. It is found that the slotted waveguide antenna array can be easily designed using the Stevenson formula and the resonance length obtained from mutual coupling environment. The measured gain of the linear antenna array is 17. 83 dB and the simulation result is 18. 2 dB. The measured sidelobe is -28. 12 dB and the simulation result is -29. 97 dB. The measured gain of the planar antenna array is 27 dB and the simulation result is 27. 9 dB. The measured sidelobe of H-plane is -27. 2 dB and the simulation result is -29. 9. The measured sidelobe of E-plane is -22 dB and the simulation result is -22 dB. The test results of the antennas are highly consistent with the simulation results.