1. Introduction
Global positioning system (GPS) is one of the intelligent transport system (ITS)
applications. The GPS antenna operates at both the L1 and L2 bands (1.575GHz
and 1.227GHz). In a mobile communication system such as the GPS, the car antenna
is required to be as small as possible.
In this paper, the small dual–band circularly polarized square MSAs for GPS
application is proposed and the operational principles and the characteristics of the
antenna are clarified by the simulator. The antenna consists of a square patch with
slits and four T-shaped elements. The T-shaped element is loaded at each slit of
the square patch. Yang et al. have proposed small dual–band circularly polarized
square MSA with four T-shaped elements at edges of the square patch and shown the
measured antenna characteristics [1]. The antenna proposed in [1] operates at about
two resonant frequencies of TM10 and TM30 modes. Therefore, it is difficult that the
ratio of the two frequencies giving the best axial ratio decreases to apply the antenna
to the GPS (the ratio of two frequencies of GPS=1.284). The frequency ratio of the
antenna in [1] is approximately 1.7.
In the calculations in this paper, the simulator software package IE3D 10.2 based
on the method of moments in the spectral domain [2] is used.
2. Geometry of Antenna
Fig. 1 shows a dual–band circularly polarized square MSA for GPS application.
The width of the square patch is WT. In order to achieve right handed circular
polarization in the dual bands, the widths of the T-shaped elements along the x axis
are wider than those along y axis, db > dc, and the lengths are both da. The width
of the slits between the square patch and T-shaped elements is St.
The relative dielectric constant and thickness of the dielectric substrate are ε
r=2.60
and h=2.4mm, respectively. The antenna is excited at x0, y0 around the diagonal on
the patch by a coaxial feeder through the dielectric substrate.
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Global positioning system (GPS) is one of the intelligent transport system (ITS)
applications. The GPS antenna operates at both the L1 and L2 bands (1.575GHz
and 1.227GHz). In a mobile communication system such as the GPS, the car antenna
is required to be as small as possible.
In this paper, the small dual–band circularly polarized square MSAs for GPS
application is proposed and the operational principles and the characteristics of the
antenna are clarified by the simulator. The antenna consists of a square patch with
slits and four T-shaped elements. The T-shaped element is loaded at each slit of
the square patch. Yang et al. have proposed small dual–band circularly polarized
square MSA with four T-shaped elements at edges of the square patch and shown the
measured antenna characteristics [1]. The antenna proposed in [1] operates at about
two resonant frequencies of TM10 and TM30 modes. Therefore, it is difficult that the
ratio of the two frequencies giving the best axial ratio decreases to apply the antenna
to the GPS (the ratio of two frequencies of GPS=1.284). The frequency ratio of the
antenna in [1] is approximately 1.7.
In the calculations in this paper, the simulator software package IE3D 10.2 based
on the method of moments in the spectral domain [2] is used.
2. Geometry of Antenna
Fig. 1 shows a dual–band circularly polarized square MSA for GPS application.
The width of the square patch is WT. In order to achieve right handed circular
polarization in the dual bands, the widths of the T-shaped elements along the x axis
are wider than those along y axis, db > dc, and the lengths are both da. The width
of the slits between the square patch and T-shaped elements is St.
The relative dielectric constant and thickness of the dielectric substrate are ε
r=2.60
and h=2.4mm, respectively. The antenna is excited at x0, y0 around the diagonal on
the patch by a coaxial feeder through the dielectric substrate.
Do Drive thay đổi chính sách, nên một số link cũ yêu cầu duyệt download. các bạn chỉ cần làm theo hướng dẫn.
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