A miniaturized dual polarization antenna for a small wireless terminal

The growth of mobile communication has been very rapid and people can call from everywhere even in moving vehicles. Another trend is that personal computers (PCs) are becoming indispensable communication tools for business. Naturally, people desire to communicate through PCs even from outdoors, and research has considered wireless computer communication. One technical problem of wireless computer communication is how to realize a small efficient antenna for installation on a wireless IC-card. There have been some antennas reported. However, the only one that can be integrated into an IC-card is installed on the face of the IC card, so its performance degrades when it is inserted into the card-slot. We propose a new type of antenna for an IC-card which can be seen through the aperture of the card-slot. Since this antenna consists of two radiation elements which radiate V-polarization and H-polarization beams, it has a good performance regardless of the terminal inclination. This paper describes the configuration of the proposed antenna and its performance and shows its feasibility as a 2 GHz wireless system antenna.