Abstract
The impedance matching is an important technique for the improvement of the transmission efficiency of the waveguide slot array antenna with the dielectric lenses. We apply the electromagnetic field analysis technique to the impedance matching method by inserting the tuning screw into the waveguide wall. To reduce the VSWR over the frequency band, the optimization method of the tuning screw by the μGA is proposed. The objective function of the μGA is calculated by the FDTD method. From the calculation results, the VSWR in the frequency range from 11.8 to 12.2 GHz is improved by optimizing the screw parameters. The antenna matching by the μGA shows good performance as compared with that by the conventional method. Also, the validity of the proposed method is confirmed by the measurement result.
