Simulation Analysis of Planar Antennas with Multi-Frequency Bands

H. Matsui and T. Wakabayashi (Japan)


Multi-frequency bands, Multi-resonance, Planar antenna, Antenna For three frequency bands, the combination of digital TV, GPS, and a third-generation cellular phone (W CDMA) is chosen.


For the purpose to adaptability to multifunctional PDA, the multi-resonance type planar antenna printed on dielectric substrate has been studied. [1] [2]Mobile communication technologies have been advanced and many kinds of personal digital assistant (PDA) have been developed. In this paper, we propose using planar antennas printed on dielectric substrates for mobile communication, and analyze the characteristics of the basic antenna, such as return loss, radiation pattern, and axial ratio, using the FDTD method. We developed a new type of planar antenna by modifying the basic planar antenna and applying it to mobile communications. The characteristics of the modified antenna are described. This paper describes our simulation analysis of the new type of planar antennas with multiple frequency bands by the FDTD method and their applications for mobile communications. Two types of planar antennas with two frequency bands are chosen. Type 1 is a combination of Vehicle Information and Communication System (VICS) and Electronic Toll Collection System (ETC) for a car. Type 2 is a combination of an 800MHz band cellular phone and wireless LAN for a mobile personal computer. The type 1 combination, VICS/ETC, employs a linearly polarized wave and a circularly polarized wave; the type 2 combination, a cellular phone and wireless LAN, uses linearly polarized waves for both.

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