Abstract
A novel design of high-gain and low-scattering waveguide slot antenna is proposed in this paper. Firstly the scattering pattern of artificial magnetic conductor (AMC) composite surface is estimated by array factor anal- ysis method. The comparison between octagonal ring arrangement and chessboard arrangement proves that the former arrangement has the characteristic of diffuse- ness-like and expands the bandwidth of radar cross section (RCS) reduction. Secondly, the metal surface of waveguide slot antenna (WSA) is replaced by the octagonal ring arrangement composite surface (ORACS). The gain is improved because of spurious radiation units which are around the slot. At the same time using the phase cancella- tion principle, a backscatter null achieves RCS reduction in the vertical direction. Experimental results show that for the novel antenna after loading with the ORACS, the gain is improved by 5 dB; the bandwidth of RCS reduction (re- duction greater than 10 dB) is 5.24-5.92 GHz.
Highlights
With rapid development of stealth technology, radar cross section (RCS) has become a major specification of aircrafts
In [10], the metal surface of waveguide slot antenna (WSA) is replaced by the ultra-thin absorber, and the gain is decreased in consequence of loading with the lump resistance
In [14], the composite surface which is combined of artificial magnetic conductor (AMC) and PEC by chessboard arrangement is loaded on the WSA, the gain is improved by 5.1 dB, and the fractional bandwidth is 5.8%
Summary
With rapid development of stealth technology, RCS has become a major specification of aircrafts. In [5], the AMC is loaded around the rectangular microstrip antenna, the gain is improved in consequence of the change of surface current. In [10], the metal surface of WSA is replaced by the ultra-thin absorber, and the gain is decreased in consequence of loading with the lump resistance. In 2007, Paquay proposed a novel structure which is combined of AMC and PEC by chessboard arrangement [12]. In [14], the composite surface which is combined of AMC and PEC by chessboard arrangement is loaded on the WSA, the gain is improved by 5.1 dB, and the fractional bandwidth is 5.8%. Experiments are carried out to verify the simulation results, and the experimental results show that the gain of the antenna is improved by 5 dB, and the fractional bandwidth of RCS reduction is 12.3%
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