This research work presents a planar compact electromagnetic bandgap (EBG) structure with the potential to reduce the mutual coupling between the elements of a microstrip antenna array. The proposed structure is investigated at 5.59 GHz, which is the centre frequency of the wireless local area network band. To achieve the highest radiation performance for microstrip antenna arrays, with minimal inter‐element spacing and mutual coupling, different unit cell arrangements were considered along with two adjacent patch elements. The simulations and measurement results for the proposed arrangements indicate that the mutual coupling tends to diminish significantly. For instance, when adjacent patches are spaced by 0.4λ, the mutual coupling improves by ∼25 dB. For the particular spacing of 0.4λ, it is favourably observed that the proposed EBG cells can also improve the antenna gain by ∼2.5 dB. Such improvements can be attributed to the compactness of the cells (∼λ/8 × λ/10) and their remarkable ability to suppress the surface waves.

Abstract-The transmission line transfer matrix method (TLTMM)is presented for the analysis of multilayer electric structures as frequency selective surfaces (FSS), whereby the reflection, transmission and absorption coefficients, field distribution and power flow may be computed inside and outside of the layers. The TLTMM formulation may be developed for any arbitrary angle of incidence, any polarization (linear TE or TM, circular, elliptical) of the incident plane wave, at any frequency of operation (microwave, millimeter wave, optical), any number dielectric layers with arbitrary thicknesses, lossless or low loss dielectric media, inclusion of dispersion relation, etc. A general formulation is given for both the TE and TM polarization of the incident wave. Several practical situations are treated by TLTMM namely, anti-reflection coatings, high reflection surfaces, computation of the axial ratio of the reflected and transmitted plane waves, distributed brag reflector (DBR), a narrow band filter consisting of two Fabry-Perot resonators, cantor superlattices in optics, field distribution and power flow for a multilayer structure. Consequently, it is verified that TLTMM is capable of analysis a variety of practical multilayer dielectric structures.

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