Design of a Shared-Aperture Dual-Loop Antenna Using a Mutual Complementary Shape to Improve an Electromagnetic Transparent Characteristics Between S/X-Band Elements

Design of a Shared-Aperture Dual-Loop Antenna Using a Mutual Complementary Shape to Improve an Electromagnetic Transparent Characteristics Between S/X-Band Elements

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In this paper, we propose an S/X-band shared-aperture array antenna with a mutual complementary design to improve the electromagnetic (EM) transparent characteristics.A unit-cell of the proposed antenna includes one dual-loop element for the S-band and $3 imes 3$ dual-loop elements for the X-band.To configure the shared-aperture structure in a limited space, the S-band element is stacked on top of the X-band elements.

To solve the practical engineering problems of the shared-aperture antennas, novel design techniques such as using Furnitue a mutual complementary structure, a coupling compensation array, an interface layer, and an antenna modularization are employed.To verify the antenna feasibility, the fabricated unit-cell extends into a $4 imes 4$ unit-cell array.The fractional bandwidth of the reflection coefficients for the proposed array are Collections 14.

7% and 15% in the S- and X-bands, respectively.In the S-band, as the steering direction of the main beam increases from 0° to 45°, the maximum gain decreases from 14.6 dBi to 11.

8 dBi.In the X-band under the same conditions, the maximum gain varies from 26.6 dBi to 25.

3 dBi.