Omnidirectional multi-band stacked microstrip patch antenna with wide impedance bandwidth and suppressed cross-polarization

Abstract

In this paper, triple-band stacked microstrip patch antennas (MPAs) are presented with wide impedance bandwidth and suppressed cross-polarization level. Triangular and circular shaped slots are embedded in the patch of antenna. Slot-loaded microstrip patches are fed with meandered microstrip line supported by a semi-ground plane structure. Triangular shaped slot-loaded MPA shows triple resonance at frequencies 2.2, 4.45, and 5.3 GHz having bandwidth of 45.9, 19.23, and 15.67%, respectively. Circular shaped slot-loaded MPA also shows triple resonance at frequencies 2.2, 4.42, and 5.38 GHz having bandwidth of 50.24, 33.21, and 13.43%, respectively. Using circular slot in place of triangular; bandwidth of the first and the second band is improved by 4.34 and 13.98%, respectively. Both the proposed antennas show an omnidirectional radiation pattern at all three resonance frequencies in the xz-plane with almost 0 dBi gain. Both the proposed antennas are fabricated on a FR-4 epoxy substrate and show a minimum level of cross-polarization radiations.

Multiband Stepped Antenna for Wireless Communication Applications

“…The radiation patterns were measured in an isolated anechoic chamber by using two antennas which are a double ridged horn antenna-model AH-118 (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) GHz and the fabricated antenna. Figure 9 and 10 show, respectively, the normalized co-polarization and cross polarization radiation patterns in both orthogonal planes at three different frequencies from the operating ranges: 1.99 GHz, 6.2 GHz, and 10.33 GHz.…”

“…To avoid potential interferences, the development of multiband antennas has received widespread concentration in recent years for designing efficient compact multi-functional devices [2][3][4]. Thus, there are strong demands to design multipurpose antennas which should ensure a multiband operation with suitable characteristics, such as: compact structure, low manufacturing cost, low-profile, easy integrating circuit boards and good radiation performances over the working bands [5][6]. Until now, with the use of a variety of techniques, various types of multiband antennas have been presented in the literature for many wireless communication systems application such as those proposed in [5][6][7][8][9][10][11][12][13][14].…”

“…Thus, there are strong demands to design multipurpose antennas which should ensure a multiband operation with suitable characteristics, such as: compact structure, low manufacturing cost, low-profile, easy integrating circuit boards and good radiation performances over the working bands [5][6]. Until now, with the use of a variety of techniques, various types of multiband antennas have been presented in the literature for many wireless communication systems application such as those proposed in [5][6][7][8][9][10][11][12][13][14]. Among of usual employed techniques to produce multiband function in broadband antennas included the technologies: fractals [7][8][9], multilayer [10][11], meta-materials [12], stubs loaded [13], slot-etched [14], loading the matching network [15], and radiators coupling [16].…”

Compact stack EBG structure for enhanced isolation between stack patch antenna array elements for MIMO application

“…It is plotted with θ variation from 0° to 360° on ϕ = 0° and ϕ = 90° plane and uses the far-field simulation feature of HFSS and anechoic chamber facility for measured results. The stack design yields a bidirectional pattern due to the presence of multiple radiating patches arranged in a stack configuration [13, 14]. Figure 12 depicts the radiation plot of the stack antenna element in a 2 × 1 antenna array in the presence of stack L slot EBG structure.…”