Wideband Gap Coupled Assembly of Rectangular Microstrip Patches for Wi-Max Applications

Abstract

This paper presents a wideband gap coupled assembly of rectangular microstrip patches applicable in lower and upper band of Wi-Max applications utilizing six directly and parasitically coupled patches. Considered assembly of patches on glass epoxy FR4 substrate has overall dimension of 40.0 mm by 52.88 mm. The proposed antenna is designed to function in the lower band (2.4-2.69 GHz) and upper band (5.25-5.85 GHz) of Wi-Max systems. The antenna is simulated using IE3D simulation software in view of the Wi-Max standards adopted by IEEE 802.16 working group. The simulated and measured results are well in agreement and show that antenna resonates in two bands proposed for wireless communication applications and successfully achieves the bandwidth of 11.2% (at VSWR: 1.5) with respect to the center frequency of 2.84 GHz in lower band and 9.7% with respect to the center frequency of 5.39 GHz in upper band. Gain and efficiency of antenna in these two bands are however low due to lossy substrate but radiation patterns in each of these two bands are identical in shape in entire bandwidth region. In lower band maximum radiations may be achieved normal to patch geometry but in upper band, direction of maximum radiations is inclined at θ = 60° perhaps due to the generation of higher mode.

Multi-Resonator Variations of Circular Microstrip Antenna With Narrow Annular Sectoral Patches for Wideband Response

“…The planar configuration using a circular MSA (CMSA) gap-coupled with parasitic circular patches [6] exhibited less BW due to the curved circumference of the CMSA. Also, the gap-coupled configurations [11,13,18,25] occupied larger area as the parasitic patch dimensions were comparable with that of the fed patch. Hence, the space around the fed MSA should be utilized in such a way that maximum coupling takes place between the fed and parasitic patches, resulting in an optimum BW without much increase in the overall patch size.…”

“…On the other hand, gap-coupled configurations are simpler and also result in increased gain due to larger aperture size. Additional patches can be incorporated on the same plane as that of the fed patch (planar multi resonator configurations) [13][14][15][16][17][18][19][20][21][22][23], or they can be placed above the fed patch (stacked configurations) [24][25][26][27][28][29]. In comparison with the planar configurations, stacked configurations result in an increased cross polarization radiation due to the volume enhancement in terms of total substrate thickness.…”

Extremely Wideband Semi Elliptical Antenna for 5G Application

“…Many techniques may be found in the open literature to overcome this issue of low impedance bandwidth. Some of the impedance bandwidth enhancement techniques include multilayer stacking arrangement of the antenna [3], the introduction of a low permittivity substrate [4] in-between ground and patch, different types of slots and strips introduced on the top metallic patch or/and on the ground [5][6], the arrangement of multiple resonators in the same plane coupled directly with each other or/and by some gap [7][8], etc. All these techniques have their own pros and cons and can be applied at the system's convenience.…”

A Novel Design of Parasitically Gap Coupled Patches Forming an Elliptical Patch Antenna for Broadband Performance

“…Another technique involves multilayer structures with parasitic patches like E, V, and H shapes, which excites multiple resonant modes [9]. V. Sharma M. M. Sharma [10] presented a wideband gap coupled assembly of rectangular microstrip patches applicable in lower band and upper band of Wi-Max applications utilizing six directly and parasitically coupled patches. The proposed antenna works in the lower band (2.4-2.69 GHz) and upper band (5.25-5.85 GHz) of Wi-Max systems.…”