Array-Antenna Decoupling Surface

A very closely‐spaced 2 × 1 microstrip‐patch array antenna is proposed for present and future modern compact array systems. Between the antennas, a novel isolation structure developed from two parasitic L‐shaped strips with only one via for each one is presented to reduce the mutual coupling more than 53 dB at the resonant frequency in 10 GHz in comparison with the conventional array without any isolators. Unlike the other methods, this isolator has a simple and cost‐effective structure with a good performance, low destructive effects on the radiation and resonance position, low design and fabrication complexity, and simple optimization method which can notably block the surface and space waves between the antennas. Simplified semi‐analytical expressions and a guided‐wave‐length‐based parametric study are conducted on key geometrical parameters of the isolator circuit model to determine their effects on the overall behavior. To validate the technique and present its advantages, the final design has been fabricated, measured, and compared with the selected recently proposed suitable works. A good agreement was also achieved in comparison with the simulated results.

Section: Fabrication Results Discussion and Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of a very closely‐spaced antenna array with a high reduction of mutual coupling using novel parasitic L‐shaped strips

Zaker

2018

“…To do the measurement, one port is only fed and the radiation pattern is then tested. [20][21][22][23] Comparable co-and cross-polarization components are obtained at both E-and H-planes. This feature is beneficial for handheld/portable MIMO devices, as the position of them is nonpredictable in practical applications.…”

Section: Enz-loaded Array Of Microstrip Patch Antennasmentioning

confidence: 93%

“…As the size of the antenna element (33.5 × 50 mm) at the lower resonance frequency is about 1.17λ, as expected the radiation patterns are similar to an equivalent microstrip patch, and the half‐space radiation pattern is achieved. To do the measurement, one port is only fed and the radiation pattern is then tested . Comparable co‐ and cross‐polarization components are obtained at both E‐ and H‐planes.…”

Section: Enz‐loaded Array Of Microstrip Patch Antennasmentioning

confidence: 99%

A broadband array antenna using epsilon-near-zero metamaterials for MIMO applications

Mazaheri

Jafargholi

2018

In this article, the capability of epsilon‐near‐zero (ENZ) metamaterial (MTM) to reduce mutual coupling between densely packed array elements is examined. The results show a reduction in mutual coupling between antenna elements and provide a possible way to reduce the element separation. To verify and confirm the simulation results, a prototype of the proposed ENZ structure incorporating an array of closely implemented patch antennas, 0.12λ L, are fabricated and tested. The array antenna has an overall dimension of approximately 2.66λ L × 1.75λ L × 0.05λ L while achieving an average gain and efficiency of 7 dB and 85%, respectively. Measurement shows that the mutual coupling is mostly better than −20 dB across a broad bandwidth of >2.6:1 (10.5–27.7 GHz).

“…The most typical case is array‐antenna decoupling surface which is placed in front of the antenna array and from which the partially diffracted waves can counteract the coupled waves. Though the examples in Ref . are eight‐element arrays, the decoupling principle actually only takes effect between adjacent elements.…”

Section: Introductionmentioning

confidence: 99%

Decoupling antenna array with X-shaped strip

Zou

Wang

et al. 2018

Manipulating mutual coupling between antenna array elements is always a critical essential in designing phased arrays. In this article, an X‐shaped strip is applied to decouple a five‐element E‐plane microstrip antenna array, whose adjacent elements' center‐to‐center spacing is only 0.45 λ0. Simulation and measurement results reveal that the proposed array employing the loaded structure exhibits excellent decoupling capability, as in comparison to the reference array, impedance of every port is well matched, mutual coupling between both adjacent elements and nonadjacent ones is efficiently reduced and radiation patterns of every individual patch are markedly corrected. Besides, when beam scanning is performed, the proposed array is equipped with higher gain and lower SLL. The X‐shaped strip predicts a promising application in phased array and a large‐scale array.