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

Abstract

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

A Wideband Self‐Decoupled Microstrip Patch Antenna Array Using Characteristic Modes of Ground Plane

“…As can be observed in Refs. [2,4,6], additional decoupling structures need to be introduced, which increases the complexity of the system undesirably. Moreover, the decoupling structures in Refs.…”

“…In the past decade, a series of decoupling structures have been proposed to improve the isolation between antenna elements [2][3][4][5][6][7] . For instance, directly placing decoupling structures between or over the antenna elements suppresses the propagation of space waves or surface currents, such as defective ground structure (DGS) [2] , resonator [3] , metamaterial [4] , etc.…”

“…In the past decade, a series of decoupling structures have been proposed to improve the isolation between antenna elements [2][3][4][5][6][7] . For instance, directly placing decoupling structures between or over the antenna elements suppresses the propagation of space waves or surface currents, such as defective ground structure (DGS) [2] , resonator [3] , metamaterial [4] , etc. Alternatively, establishing new coupling paths counteracts the original coupling paths such as the use of neutralizing line [5] , parasitic element [6] , decoupling network [7] , etc.…”

Massive MIMO Array Design With High Isolation by Using Decoupling Cavity

“…The isolation enhancement in terms of the surface waves coupling suppression includes electromagnetic bandgap structure (EBG), defected ground structure, parasitic structures, metamaterial, and so on [7][8][9][10][11]. Typically, the mentioned technologies need a relatively larger space to employ the decoupling structure between the array elements.…”

Wideband dual‐polarized antenna with high isolation for full‐duplex application

“…The isolation of traditional dual-polarized antenna is 15-30 dB. [3][4][5] To obtain high Tx-Rx isolations for full-duplex antennas, many techniques such as auxiliary port, 6,7 different modes, 8,9 and parasitic resonator [10][11][12] have been employed. However, they suffer from limited bandwidth of less than 20%.…”