Wide-band L/X Dual-Band Share-aperture Phased Array Antenna

In this paper, a Wide-band L/X dual-band share-aperture phased array antenna is proposed. The L-band element is cavity-backed slot antenna, and for X-band, slot antenna is used. Simulated results show that the operating bandwidth of proposed antenna is 7.5 to 12.5 GHz in X-band and 1.7 to 2.1 GHz in L band, indicating a wide-band performance. In addition, the X-band antenna can scan up to ± 45° in E plane. Meanwhile, two different feeding structures are used to feed the X-band antenna to avoid the cavity of the L-band antenna. The polarization direction of the antennas in two frequency bands can be orthogonal or parallel according to these structures.