Power divider is a device which turns one-channel input signal into two-channel or multi-channel output with equal or unequal energy. Reversely, it is also called combiner when combining multi-channel into one-way output. Power divider usually distributes equivalent energy, through the collocation of impedance transformation route and isolation resistance, yielding wide-band characteristics. Lopu power dividers include 2-way, 3-way and 4-way components, through whose concatenation multi-way power distribution can be formed.