A Compact Dual-Band Van Atta Array Based on the Single-Port Single-Band/Dual-Band Antennas

A compact dual-band Van Atta array work at
C
/
X
bands is proposed in this letter. A single-port dual-band antenna (SPDBA) and single-port single-band antenna (SPSBA) are designed for the dual-band Van Atta array. The structure reused method is employed in the design of the SPDBA. The high-frequency antenna is reused as the excitation structure of the low frequency antenna. The SPDBAs and the SPSBAs are interlaced to form a dual-band antenna array, which can reduce the number of antennas and control the antenna spacings. The spacings of the antennas in
C
/
X
bands are 0.54
λ
_L0
and 0.51
λ
_H0,
respectively. The single-layer and single-port structure of the antennas effectively reduce the number of transmission lines and the size of the dual-band Van Atta array. The total size of the compact dual-band Van Atta array is 142 × 30 × 3.2 mm. The −4 dB beamwidths of the monostatic radar cross section at 5.8 and 10.6 GHz are 59° and 62°.