Recently, wireless communication systems have been developed and the circuits which operate with the broad-band for multiband uses were introduced. However, broad-band circuits have problems that inevitably increase the size. Dual-band circuit operates only two frequency, therefore, it will be able to miniaturize through unnecessary decreased elements.
The Wilkinson power divider is the one of the most commonly used components in wireless communication system for power division. Nowaday, the Wilkinson power divider is also demanded dual-band. The Wilkinson power divider that operates in a dual-band was introduced a few type, until now. However, they also have cascaded transmission lines, so they are unsuitable for circuit miniaturization. In this paper, I propose miniaturized dual-band Wilkinson power divider operating at 2.45 GHz and 5.2 GHz for IEEE 802.11n standard.
Proposed dual-band Wilkinson power divider is used in parallel stub line. The design is accomplished by transforming the electrical length and impedance of the quarter wave sections of the conventional Wilkinson power divider into dual band π-shaped sections.
The design method of each element value was described specific in chapter 2 of this paper. In chapter 3, proposed dual-band Wilkinson power divider is shown through designed elements value. The validity of proposed design method was verified through fabrication and measure.