Reducing the Mutual Coupling of Cylindrical Circular Microstrip Antennas (CCMAs) Array Using EBG Structure

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DOI:

https://doi.org/10.21123/bsj.2023.7050

Keywords:

Array Antennas, Conformal microstrip antennas, EBG structure, FDTD method, Mutual coupling.

Abstract

A theoretical study to design a conformal microstrip antennas was introduced in this work. Conformal microstrip antennas define antennas which can be conformed to a certain shape or to any curved surface. It is used in high-speed trains, aircraft, defense and navigation systems, landing gear and various communications systems, as well as in body wearable. Conformal antennas have some advantages such as a wider-angle coverage compared to flat antennas and low radar cross-sectional (RCS) and they are suitable for using in Radome. The main disadvantage of these antennas is the narrow bandwidth. The FDTD method is extremely useful in simulating complicated structures because it allows for direct integration of Maxwell's equations depending on time. The 1x2 cylindrical circular microstrip antennas array is designed and simulated vertically via Finite Difference Time Domain (FDTD) method where can directive antenna be achieved through antennas array design. Mutual coupling between the antennas in the array and the different separation between them were studied. The circular patch is excited by a probe feed method for several reasons including providing less spurious radiation from the probe current, in addition to the simplicity in theoretical engineering installation and practical manufacturing. It is well known that the values of the coupling are decreased as the distance separation increased. Cylindrical circular microstrip antenna with resonant frequency operating is 3.5GHz for  mode, several parameters like return loss, band width, and input impedance are calculated. Also, for isolated coupling, mutual coupling coefficients, directivity gain, for different separations between the centers of the two adjacent circular patches in terms the wave length operating are calculated. Moreover, the electromagnetic band gap EBG structure is used for reducing the mutual coupling created by the surface waves in order to enhance the antenna's performance in an array has become smaller than before. The proposed EBG is a three triangular-shape equal sides metallic structure, utilizing the inter-element spacing in an array. The less value of   for the spacing between the two centers of patches is . BW percentage increased to 34.3% and the directivity is enhanced also.  Additionally, simulations were done using MATLAB 2017b.

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References

Wa’il A, Shaaban RM,Ahmed ZA .Designing a Microstrip Patch Antenna in Part of Ultra-Wideband Applications. Baghdad Sci J. 2020; 17(4): 1216. https://doi.org/10.21123/bsj.2020.17.4.1216

Naik M N. Design of compact annular ring microstrip antenna for multiband communication system. JNCET.2017; 7(8): 24-28.

Josefsson L,Persson P.Conformal Array Antenna Theory and Design. Canada: Wiley-IEEE Press; 2006, 512 p.

Hati K, Sabbar N, El Hajjaji A, Asselman H.A novel multiband patch antenna array for satellite applications. Procedia Eng. 2017; 181: 496-502.

Ijaz B, Sanyal A, Mendoza-RadalA, Roy S, Ullah I, Reich M, et al. Gain limits of phase compensated conformal antenna arrays on non-conducting spherical surfaces using the projection method. In: IEEE Int. Conf. Wirel. Extreme Environ. conf. dig. (WiSEE); 2013: 1-6.

Zhu S, Langley R. Dual-band wearable textile antenna on an EBG substrate. IEEE Trans. Antennas Propag. 2009; 57(4): 926-935.

Galli H S, Ahmed Z A, Abood A H. Mutual Coupling Reduction in Microstrip antenna array Using ebg. J Basrah Res Sci. 2018;44(1): 122-132.

Areebi N A, Ahmed Z A, Aubais M M. New Design of Cylindrical Rectangular Microstrip Antenna (CRMA) By Using The Slots Technique. J Kufa phys..2020; 12(1): 1-8.

Guo Z, Tian H, Wang X, Luo Q, Ji Y.Bandwidth enhancement of monopole UWB antenna with new slots and EBG structures. IEEE antenn wirel pr. 2013; 12: 1550-1553.

Azita L Y, Hafizi H, NorsuzilaY, Nur H M H. Performance Analysis of Propagation in VHF Military Tactical Communication System. Baghdad Sci J. 2021; 18(4): 1378-1386. https://doi.org/10.21123/bsj.2021.18.4(Suppl.).1378

Kohar S, SinghS,De A .Design of Low Profile Cylindrical Conformed Microstrip Patch Antenna for Wideband Operation. IETE J Res. 2021 Jul; 29: 1-10.

Godara LC. Handbook of Antennas in Wireless Communications. USA: 1st Ed. CRC press; 2002, 936 p.

Al-Hillo M M, Nabeel A A. Bandwidth Enhancement of Hexagonal Patch Microstrip Antenna with Several Approaches. J. Basrah Res Sci. 2017; 35: 1-11.

Bérenger JP . Perfectly matched layer (PML) for computational electromagnetics. Synth Lect Comput Electromagn. 2007; 2(1):1-117. https://www.ate.uni-due.de/data/coft1/JOCP_1994_Berenger.pdf

Taflove A, HagnessSC,Piket-May M.Computational electromagnetics: the finite-difference time-domain method. The Electrical Engineering Handbook. 2005; 3: 629-670. https://doi.org/10.1016/B978-012170960-0/50046-3

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Published

2023-08-01

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