A Wideband Phased-Array Antenna with Harmonic Suppression Based on Transformed Radial Stubs

An X-band phased-array antenna unit with harmonic suppression is formed on the basis of a printed dipole antenna by integrating a low-pass filter with a transformed radial stubs(TRS) fed by stripline. The antenna with harmonic suppression is only 2.44mm higher than the antenna without harmonic suppression. The measured results of the 8×8 small test array show that the suppression of the fundamental wave with respect to the second harmonic is at least 15 dB, and the average can reach 20dB.