Study on Radiation Characteristics of QRHA Based on Gaussian Ridge Profile

The study on radiation characteristics of quad-ridged horn antenna (QRHA) by altering the ridge profile is presented. The evaluation of ridge profile is carried out based on the Gaussian function. The characterization is performed by varying variables in the function, namely gap between the ridge profiles, width of the horn aperture, length of the antenna horn, and maximum factor of the Gaussian function. The beamwidth and sidelobe level are the observed terms to represent the performance of proposed QRHA. It is found that the parameters significantly influence the performance of QRHA are width of the horn aperture and maximum of the Gaussian function. It can be inferred that the narrower antenna beamwidth is obtained in accordance with increasing both of parameters. While in term of sidelobe level, the optimum performances are achieved by reducing aperture of the horn and maximum of the Gaussian function.