Broadband Dipole Antenna Array With Multiple Self-Decoupling Nulls

Abstract

This letter develops a broadband dipole antenna array with self-decoupling characteristics. A typical dipole antenna is modified by integrating multiple resonators into the antenna element through the incorporation of metallic branches into both the radiating and shorting patches. The multicoupling cancellation can be achieved by meticulously regulating the coupling magnitudes and phases between resonators of adjacent antenna elements. A two-element antenna array is constructed with a center-to-center spacing of 0.46 λ_L. The simulated results validated an operational bandwidth of 1.7 GHz to 2.2 GHz and in-band mutual coupling level below −25 dB. Furthermore, a 1 × 4 antenna array was constructed and simulated to verify the extensibility of the developed self-decoupled array. A prototype of the 1 × 2 antenna array was fabricated and measured, and excellent consistency between the simulated and measured results was achieved.