Patent ID: 7495528
Filing Date: 2009-02-24
Classification: H03H,H04B,H04L

Abstract:
1. A triplexer circuit for separating an input signal into signals in three frequency bands which are different from each other, comprising: a first filter module that passes signals in a first frequency band; a second filter module that passes signals in a second frequency band; and a third filter module that passes signals in a third frequency band, wherein the first, second, and third filter modules are connected in parallel with each other, the second and third filter modules form a parallel resonant circuit for signals in the first frequency band, the first and third filter modules form a parallel resonant circuit for signals in the second frequency band, and the first and second filter modules form a parallel resonant circuit for signals in the third frequency band, wherein when a pass frequency of the first filter module is f where θ i (f 1 ): phase of a reflection coefficient at the frequency f 1 in the i-th (=1, 2, 3) filter module, θ θ n