The wide band antenna for both IMT2000 and PCS using U-slot

The IMT2000 service has a variety of advantages, such as fast data and image transfer. However, PCS and cellular phones are still more used. In this transition period, it is useful to have a single base station for both PCS and IMT2000. A wide band antenna using U-slot structures is proposed for PCS at 1.75-1.87 GHz and IMT2000 at 1.92-2.17 GHz. This antenna is composed of two thin microstrip substrates and foam for easy manufacture (Huynh, T. and Lee, K.-F., Electronics Lett., vol.31, no.16, p.1310-12, 1995). The U-slot of the antenna makes dual resonance in which the separation of the two resonant frequencies determines the impedance bandwidth. The dual resonant frequencies largely vary according to patch size and slot aspect. For regulating the two resonant frequencies, the tendency for the variation of parameters is derived by the FDTD method. This simulation result is compared to measured results.