Reduction of Mutual Coupling between Radiating Elements of an Array Antenna Using EBG Electromagnetic Band Structures

Abstract

In this paper, a new array antenna configuration based on Electromagnetic Band Gap (EBG) structures has been proposed for 3.5GHz wireless communication systems. The proposed slotted EBG structure, high impedance surface (SHI), consists of three squares and a square ring deposited on a substrate (Rogers RO4350) which has a relative permittivity of 10.2 and a thickness of 1.27mm. Initially a matrix of 3×7 unit cells of EBG structures is introduced between two patches of an array and then a matrix of 3×14 unit cell of EBG structures is integrated between eight patches, which resonate around 3.5GHz (Wi MAX). The insertion of these structures between the radiating elements of an array antenna reduces the mutual coupling and antenna dimensions by approximately (8dB, 11%) and (12 dB, 5%) respectively for two, eight elements array antenna. In addition, the directivity has been slightly improved in the presence of EBG structures, from 4.52dB to 6.09dB for a two-element array antenna, and from 8.18dB to 8.4dB for an eight-element antenna.

Development of a Triple Band Notched UWB Antenna

“…The novelty of the design lies in the combination of a modified EBG and a slot for frequency notching. This method successfully notched three frequencies with only two notching devices, unlike the conversionary method, which could notch only one frequency per notching device [24][25][26]. The analysis shown in this study revealed that a triple-band frequency notch could be achieved without degrading the performance of the antenna.…”

Patch antenna design based on 1D-EBG structures for high gain applications

“…The antenna holds essential significance within a wireless communication system, and it serves as a vital element in applications such as energy harvesting, where its connection to a rectifier enables efficient operation [2]. The appearance of the microstrip patch antenna has opened up numerous options for antenna designing and manufacturing, it benefits include low cost and profile, and light weight, [3]- [5] therefore it is appropriate for today's applications. The major microstrip antenna drawbacks are limited bandwidth, gain and directivity.…”