Broadband Dipole Antenna Array With Multiple Self-Decoupling Nulls

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 multi-coupling cancellation can be achieved by meticulously regulating the the coupling magnitudes and phases between resonators of adjacent antenna elements. A two-element antenna array is constructed with center-to-center spacing of 0.46 λL. The simulated results validated an operational bandwidth of 1.7-2.2 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, excellent consistency between the simulated and measured results was achieved.