A Multi-mode Resonant Stacked Microstrip Patch Antenna for Missile-borne Applications

In order to reduce the influence of the missile antenna on the flight of the missile body and meet the needs of high-speed communication of the missile, the missile antenna needs to possess the characteristics of miniaturization, embedded missile body and broadband operation. In this paper, a multi-mode resonant laminated microstrip patch antenna suitable for missile-borne applications is proposed and adopts a ceramic dielectric substrate with high dielectric constant to realize the miniaturization of the antenna which provides a total of four working modes to form a broadband through two U-shaped patches and an annular patch on the bottom substrate and two rectangular radiometric patches on the top substrate. Considering the requirement that the antenna embedding carrier achieve conformity, a metal cavity is introduced to closely surround the antenna, and the thickness ratio of the stack is adjusted to achieve critical coupling between different modes. Finally, the proposed antenna achieves the coverage of the target frequency band through four well-coupled working modes in the target frequency band, and the design shows a good level of cross-polarization thanks to the highly symmetrical and miniaturized structure. The measured results show that the antenna achieves a band- width coverage of -10 dB from 1.45 GHz to 1.55 GHz (relative bandwidth of 6.7%) in the L-band under the condition of 35.0 mm×35.0 mm× 6.9 mm three-dimensional dimensions, and the cross-polarization level is better than -21 dB in the 3 dB beamwidth of the H-plane main lobe.