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In this paper, high port isolation in dual feed orthogonally polarized square patch antenna array is achieved by the use of Defected Ground Structure (DGS). A simple rectangular-headed cross DGS is implanted in the ground plane underneath the square patch in order to achieve high port isolation between two orthogonal ports at 2.95 GHz. The proposed design offers 58.55 dB port isolation between ports of single element patch and 45 dB that for two-element arrays. The port isolation of microstrip antenna with and without DGS has been studied and the result indicates better port isolation of the array with high cross polarization for two orthogonal polarizations owing to the effect of DGS. Finally, the two-element array is considered for MIMO application and mutual coupling between them is investigated. The simulated results of the proposed antennas are found to be in close agreement with the experimentally measured ones. [ABSTRACT FROM AUTHOR]

Electromagnetic coupling is one of the important and necessary issues for the design of antenna arrays. Mutual coupling degrades array performances like antenna gain, radiation pattern, antenna efficiency etc. In this paper, the authors have put forward a novel technique for reduction of mutual coupling between microstrip patch elements. A 4-element antenna array loaded with electromagnetic soft surfaces (EMSS) has been designed to achieve considerable suppression of mutual coupling between two adjacent patch elements. The EMSS are designed using metal strips loaded with reverse C-shaped slots. With the introduction of two EMSS unit cells between patch elements, a noticeable reduction in mutual coupling between patch elements is achieved without degradation in other performances of the array. The experimental results presented are compared with the simulated ones and it is observed that the proposed EMSS loaded array structures cause excellent suppression of electromagnetic coupling with a reduction of about 35 dB at the designed frequency of 3.65 GHz. [ABSTRACT FROM AUTHOR]

ABSTRACT A compact two-channel dual trace dual column (DTDC) printed microstrip antenna array integrated with dumbbell-shaped resonator (DSR) is presented. The DSR has been integrated with DTDC array for the reduction of mutual coupling and suppression of cross-polarization (XP) level at 5.2 GHz. In this work, an omnidirectional microstrip antenna array (OMAA) is designed with five elements and then two numbers of similar arrays have been used for multiple-input multiple-output (MIMO) application. A DSR placed in between two OMAA separated by 0.54λ suppressed 12 dB mutual coupling and 7.5 dB XP level. The mutual coupling has been studied by placing DSR on the upper trace first and then in the lower trace. The mutual coupling of 11 dB is reduced when DSR is placed on the upper trace and 12 dB when it is in the lower trace of the array structure. The DTDC antenna structure exhibits maximum XP suppression when DSR in the lower trace. The antenna with compact structure based on the design has a peak gain of 12.84 dBi and band width of 250 MHz. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2182-2186, 2014 [ABSTRACT FROM AUTHOR]

ABSTRACT A compact dual trace omnidirectional microstrip antenna array (DTOMAA) has been designed for WLAN application. The array is then integrated with dumbbell-shaped resonator (DSR) for reducing cross-polar (XP) radiation. The antenna is composed of five rectangular-shaped patch elements arranged alternately on the top and bottom surfaces of the substrate. The antenna exhibits a gain of 12.0 dBi, band width (BW) of 250 GHz, and return loss (RL) of −26 dB. By the introduction of DSR, the XP level is reduced by 7.0 dB without affecting other characteristics like copolar radiation, resonance frequency, and BW of the array. Simulated results show that the proposed antenna offers good impedance matching, high gain, and bandwidth. The simulation results are in good agreement with the measured values. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:141-145, 2014 [ABSTRACT FROM AUTHOR]

ABSTRACT Mutual coupling is an inevitable phenomenon in multielement antenna systems. It can significantly degrade the performance of array systems. A number of works have been done on the suppression of mutual coupling in the recent years. In this article, we propose a simple I-shaped resonator in between two E-shaped microstrip antenna elements separated by 0.45λ to reduce the mutual coupling in patch array of antennas. The mutual coupling has been reduced by more than 30 dB by the introduction of this simple I-shaped resonator on the same plane of the microstrip radiator. We have developed an experimental model that has proven this concept of antenna coupling reduction. Finally, the influence of other antenna parameters on the mutual coupling level has been studied. One may find its application in wireless communication. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2544-2549, 2013 [ABSTRACT FROM AUTHOR]

The article focuses on the design, analysis and optimization of a slotted microstrip patch antenna array. It stresses that the design of array antenna is important in the wireless communication industry in which it helps achieve a highly directional beam through various corrupted environments. It further discusses the advantages and disadvantages of the system.