Limits...
Low-cost dielectric substrate for designing low profile multiband monopole microstrip antenna.

Ahsan MR, Islam MT, Habib Ullah M, Arshad H, Mansor MF - ScientificWorldJournal (2014)

Bottom Line: This paper proposes a small sized, low-cost multiband monopole antenna which can cover the WiMAX bands and C-band.The proposed antenna of 20 × 20 mm(2) radiating patch is printed on cost effective 1.6 mm thick fiberglass polymer resin dielectric material substrate and fed by 4 mm long microstrip line.The experimental results show that the prototype of the antenna has achieved operating bandwidths (voltage stand wave ratio (VSWR) less than 2) 360 MHz (2.53-2.89 GHz) and 440 MHz (3.47-3.91 GHz) for WiMAX and 1550 MHz (6.28-7.83 GHz) for C-band.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, Malaysia.

ABSTRACT
This paper proposes a small sized, low-cost multiband monopole antenna which can cover the WiMAX bands and C-band. The proposed antenna of 20 × 20 mm(2) radiating patch is printed on cost effective 1.6 mm thick fiberglass polymer resin dielectric material substrate and fed by 4 mm long microstrip line. The finite element method based, full wave electromagnetic simulator HFSS is efficiently utilized for designing and analyzing the proposed antenna and the antenna parameters are measured in a standard far-field anechoic chamber. The experimental results show that the prototype of the antenna has achieved operating bandwidths (voltage stand wave ratio (VSWR) less than 2) 360 MHz (2.53-2.89 GHz) and 440 MHz (3.47-3.91 GHz) for WiMAX and 1550 MHz (6.28-7.83 GHz) for C-band. The simulated and measured results for VSWR, radiation patterns, and gain are well matched. Nearly omnidirectional radiation patterns are achieved and the peak gains are of 3.62 dBi, 3.67 dBi, and 5.7 dBi at 2.66 GHz, 3.65 GHz, and 6.58 GHz, respectively.

Show MeSH
Effect of ground plane on the VSWR of the proposed antenna.
© Copyright Policy - open-access
Related In: Results  -  Collection


getmorefigures.php?uid=PMC4127211&req=5

fig3: Effect of ground plane on the VSWR of the proposed antenna.

Mentions: The combinational effect of triangular cut at the lower part of the patch and the pair of horizontal slits at the top produces a lower resonant frequency. This can be due to the increased flow of surface currents around the triangular cut sides and the top slits as clearly observed in the figures for surface currents (refer to surface current distribution in Figure 10(a)). Introducing the circle in the patch creates the second resonant frequency (at around 4.32 GHz) along with the lower resonant frequency. In this case, the first resonant frequency is shifted a bit and the VSWR also reduced as expected. Observing the surface current distribution of the second resonant frequency has clearly validated this in which situation the currents become more concentrated near the circular slot. Finally, the addition of middle slot with the triangular cut, top slits, and circle cut is accountable for generating the third resonant frequency. Not only does this insertion of middle slot affect the two lower frequency bands by shifting to desired resonant frequency and reducing the VSWR, but also their combined effect yields the wider band for higher resonant frequency. By examining the surface current distribution presented in Figure 10(c), it is seen that increased surface currents are converging near the middle slot. The effects of different ground plane dimensions have also been analyzed for the proposed antenna. According to the radiation principle of microstrip patch antenna, an equal and opposite direction current is created on the ground plane and in phase accumulation occurs with that of patch antenna. The length of the ground plane has a dominant effect on resonant frequency and impedance bandwidth [29–31]. Figure 3 shows three types of ground plane length on the VSWR against frequency. From the figure it can be concluded that the ground plane of 4 mm long and 20 mm wide gives a better VSWR performance with adequate bandwidth to cover WiMAX bands and C-band. After successful completion of the parametric studies in the simulation process, the optimal geometrical structure of the proposed antenna has been achieved depending on the expected frequency bands. The overall size of the patch is of 20 × 20 mm2 and the complete dimensions for optimized design parameters are given in Table 1. The prototype of the proposed antenna has been fabricated and is presented in Figure 4.


Low-cost dielectric substrate for designing low profile multiband monopole microstrip antenna.

Ahsan MR, Islam MT, Habib Ullah M, Arshad H, Mansor MF - ScientificWorldJournal (2014)

Effect of ground plane on the VSWR of the proposed antenna.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4127211&req=5

fig3: Effect of ground plane on the VSWR of the proposed antenna.
Mentions: The combinational effect of triangular cut at the lower part of the patch and the pair of horizontal slits at the top produces a lower resonant frequency. This can be due to the increased flow of surface currents around the triangular cut sides and the top slits as clearly observed in the figures for surface currents (refer to surface current distribution in Figure 10(a)). Introducing the circle in the patch creates the second resonant frequency (at around 4.32 GHz) along with the lower resonant frequency. In this case, the first resonant frequency is shifted a bit and the VSWR also reduced as expected. Observing the surface current distribution of the second resonant frequency has clearly validated this in which situation the currents become more concentrated near the circular slot. Finally, the addition of middle slot with the triangular cut, top slits, and circle cut is accountable for generating the third resonant frequency. Not only does this insertion of middle slot affect the two lower frequency bands by shifting to desired resonant frequency and reducing the VSWR, but also their combined effect yields the wider band for higher resonant frequency. By examining the surface current distribution presented in Figure 10(c), it is seen that increased surface currents are converging near the middle slot. The effects of different ground plane dimensions have also been analyzed for the proposed antenna. According to the radiation principle of microstrip patch antenna, an equal and opposite direction current is created on the ground plane and in phase accumulation occurs with that of patch antenna. The length of the ground plane has a dominant effect on resonant frequency and impedance bandwidth [29–31]. Figure 3 shows three types of ground plane length on the VSWR against frequency. From the figure it can be concluded that the ground plane of 4 mm long and 20 mm wide gives a better VSWR performance with adequate bandwidth to cover WiMAX bands and C-band. After successful completion of the parametric studies in the simulation process, the optimal geometrical structure of the proposed antenna has been achieved depending on the expected frequency bands. The overall size of the patch is of 20 × 20 mm2 and the complete dimensions for optimized design parameters are given in Table 1. The prototype of the proposed antenna has been fabricated and is presented in Figure 4.

Bottom Line: This paper proposes a small sized, low-cost multiband monopole antenna which can cover the WiMAX bands and C-band.The proposed antenna of 20 × 20 mm(2) radiating patch is printed on cost effective 1.6 mm thick fiberglass polymer resin dielectric material substrate and fed by 4 mm long microstrip line.The experimental results show that the prototype of the antenna has achieved operating bandwidths (voltage stand wave ratio (VSWR) less than 2) 360 MHz (2.53-2.89 GHz) and 440 MHz (3.47-3.91 GHz) for WiMAX and 1550 MHz (6.28-7.83 GHz) for C-band.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, Malaysia.

ABSTRACT
This paper proposes a small sized, low-cost multiband monopole antenna which can cover the WiMAX bands and C-band. The proposed antenna of 20 × 20 mm(2) radiating patch is printed on cost effective 1.6 mm thick fiberglass polymer resin dielectric material substrate and fed by 4 mm long microstrip line. The finite element method based, full wave electromagnetic simulator HFSS is efficiently utilized for designing and analyzing the proposed antenna and the antenna parameters are measured in a standard far-field anechoic chamber. The experimental results show that the prototype of the antenna has achieved operating bandwidths (voltage stand wave ratio (VSWR) less than 2) 360 MHz (2.53-2.89 GHz) and 440 MHz (3.47-3.91 GHz) for WiMAX and 1550 MHz (6.28-7.83 GHz) for C-band. The simulated and measured results for VSWR, radiation patterns, and gain are well matched. Nearly omnidirectional radiation patterns are achieved and the peak gains are of 3.62 dBi, 3.67 dBi, and 5.7 dBi at 2.66 GHz, 3.65 GHz, and 6.58 GHz, respectively.

Show MeSH