Isolation enhanced circularly polarized patch antenna array using modified electric‐field‐coupled resonator

Abstract

A modified electric‐field‐coupled (MELC) resonator featuring negative permittivity is proposed to enhance the inter‐element isolation of a circularly polarized (CP) patch antenna array operated at Chinese compass navigation satellite system (CNSS) downlink band. The resonator comprises two capacitive gaps and a common inductive strip connected to the ground plane by two metal vias. A suspended microstrip line excitation is employed to efficiently design and investigate the MELC resonator whose constitutive parameters are subsequently extracted. A dual‐element CNSS antenna array has been prototyped and measured. The experimental results demonstrate that under the assistance of the proposed MELC resonator, a mutual coupling reduction of 15 dB has been achieved while maintaining good impedance matching and CP radiation performance. Details of the design considerations along with simulation and measurement results are presented and discussed.

Orthonormal method for compact Global Navigation Satellite Systems antenna array designs

“…Moreover, the maximum total efficiency is achieved at f c with a value of −0.5 dB, and also keeps above −1 dB within a range of 20 MHz, being the array more than adequate for the GPS signal bandwidth requirements. It is important to remark that the total efficiency achieved by this AA example is higher than many recently proposed compact designs . The main reason is that these array designs are intended to reduce reflected power at the expense of creating a lossy structure by, for example, employing high dielectric permittivity, fences, resonant structures, or decoupling and matching networks, which actually creates an inefficient array system.…”

“…It is important to remark that the total efficiency achieved by this AA example is higher than many recently proposed compact designs. 4,5,17,18,23,24 The main reason is that these array designs are intended to reduce reflected power at the expense of creating a lossy structure by, for example, employing high dielectric permittivity, fences, resonant structures, or decoupling and matching networks, which actually creates an inefficient array system. However, as we have previously described, it is not necessary to make use of these elements if our approach is adopted.…”

A complementary split‐ring array for compact decoupling 2 × 2 circularly polarized antenna

“…[4][5][6][7][8][9][10] These decoupling methods, however, cannot work for CP antenna due to the inherent difference in coupling modes and coupling field strength between LP and CP antenna. In recent years, efforts were devoted to enhance the isolation between CP elements, such as single-negative metamaterial, 11 planar parasitic resonators, 12 electric-field-coupled isolator, 13 hybrid technique, 14 parasitic strip 15 and magnetic surface. 16 Unfortunately, the above-mentioned researches only focus on twoelement antennas and one-dimensional antennas, while the mutual coupling reduction in two-dimensional antennas remain further elusive.…”

Diseño de antenas inteligentes

“…El uso de arreglos de antenas compactos y de pocos elementos ha cobrado gran interés en los últimos años en varias aplicaciones, por lo tanto han surgido diversas estrategias de diseño, caracterización y control, que a su vez van evolucionando con diferentes enfoques [16,52,86,113]. El criterio mayormente difundido hoy en día considera al acoplamiento mutuo entre antenas como un problema que debe ser evitado o eliminado en la medida de lo posible [51,87,89,91,92]. Son prácticamente inexistentes los casos en los que se propone favorecer el acoplamiento de manera criteriosa para optimizar ciertas características en un arreglo compacto [114,115].…”