International Symposium on Antennas and Propagation
Stacked Rectangular Microstrip Antenna Loading a Helical Pin for Triple Band Operation
Takafumi Fujimoto, Kouhei Iwanaga,
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Recently, antennas for multi band operation have received much attention and many single feed Microstrip antennas (MSAs) for dual band operation have been proposed . The authors have proposed stacked MSAs with a shorting plate or pin for dual band operation in ITS (Intelligent Transport Systems)  and in wireless LAN . In the lower frequency band, the electric current on the shorting plate (pin) is the strongest and the peak of the radiation field is at the low elevation angles (shorting plate mode). In the higher frequency band, the antenna operates as a conventional half-wavelength stacked MSA with the parasitic patch above the fed patch conductor (patch mode). Therefore, the bandwidth at the higher frequency band is wide. The authors, moreover, have proposed a stacked rectangular microstrip antenna with a shorting plate and a helical pin for triple band operation . The proposed antenna has an additional resonant mode by loading a helical pin (helical pin mode). In , the antenna characteristics at the helical pin mode were compared with those at the shorting plate mode. In this paper, the relations between the helical pin mode and the other resonant modes, the shorting plate and the patch modes, are clarified numerically. Moreover, an antenna for PHS/VICS/ETC operation in ITS is designed. In the calculation in this paper, the simulation software package IE3D 10.2, based on the method of moments in the spectral domain is used .