BAND PASS FILTER AND DUPLEXER HAVING THE SAME

摘要

A band pass filter and a duplex having the same are provided to improve attenuation characteristics in a frequency band around a pass frequency band by forming a resonator in a bridge structure. A band pass filter includes a first resonating circuit unit(100), a second resonating circuit unit(200), and a third resonating circuit unit(300). The first resonating circuit unit(100) is formed by connecting n number of first resonators in serial. The second resonating circuit unit(200) faces the first resonating circuit unit(100) and is formed by connecting m number of second resonators in serial. The third resonating circuit unit(300) is formed by connecting k number of third resonators in parallel on shunts which connect the first resonating circuit unit(100) and the second resonating circuit unit(200). The n, m, and k are the natural number larger than 1.