A Compact, Low-Profile, Broadside Radiating Two-Element Huygens Dipole Array Facilitated by a Custom-Designed Decoupling Element

A compact, low-profile, broadside radiating, two-element Huygens dipole array is developed for in-band full-duplex (IBFD) applications. Each radiating element a multilayer near-field resonant parasitic (NFRP) design that electrically small with $ka=0.76$ at its resonance frequency, notation="LaTeX">$f_{0} = 1.511$ GHz. The center-to-center distance between the elements only notation="LaTeX">$0.3\lambda _{0}$ . array’s outstanding performance facilitated by custom-designed decoupling element. This specially engineered scatterer printed on an additional layer and consists of pair meander-line resonators connected metallic strip. overall height entire system notation="LaTeX">$\lambda _{0}/20.3$ passive operates as several electric dipoles whose scattered fields mitigate interactions two radiators. It provides very high isolation levels them improves directivity array. optimized was fabricated, assembled, tested. measured results, in good agreement their simulated values, confirm structure not increases peak level from 14.4 to 50.4 dB but it also realized gain direction 0.5 corresponding front-to-back ratio (FTBR) value dB.