Yagi–Uda Antenna for Multiband Radar Applications

In this letter, a simple and compact Yagi-Uda antenna with good antenna gains is proposed for multiband radar applications. The prototype operates in three different frequency bands, namely 1.9, 2.5, and 3.5 GHz. The drivers are designed on the basis of classical dipole configuration with embedded L-shaped slotlines. On the other hand, directors and reflector are deployed to achieve good directivity over frequency bands of interest. From measurements, the prototype demonstrates high performance of the designed multiband Yagi-Uda antenna and also shows a good agreement between measurements and simulations. Measured operating frequencies are 1.89, 2.54, and 3.51 GHz, respectively, and the realized antenna gains are 6.29, 4.63, and 6.77 dBi, correspondingly. Measured front-to-back ratios are better than 10.8 dB, hence making the design suitable for radar applications.