LAUSR

ABSTRACT A novel wideband high-gain antenna array with filtering response is presented. The proposed array consists of four Yagi antenna elements and one feeding network, which could realize signal filtering, power splitting as well as impedance transforming characteristics simultaneously. The operating mechanism is analysed and the detailed design procedure is presented. For demonstration, a 2×2 array is designed at the center frequency of 3.0 GHz with the measured fractional bandwidth of 73.3%. Measured in-band maximum gain is 13.2 dB, whereas the out-of-band suppression level is better than 23.2 dB. Compared with the conventional array, the proposed filtering array shows high suppression in the stopband, good selectivity at passband edges and flat antenna gain in the passband. The simulated and measured results provide a good verification for the theoretical concepts.