A complex network can be interpreted as a connection consisting of two real networks,one ofwhich transfers the real part of the complex signal and the other transfers the imaginary part.Inthis paper,a realization of complex filters using wave digital lattice filters is reported.The relationbetween the real part and the imaginary part of its output fulfills the Hilbert transformation.As theattenuation response of a wave digital lattice filter meets some symmetrical requirements,a certainamount of hardware can be saved.Explicit formulae and the Hilbert transformer table are given.The design process is so simple that a pocket programmable calculator is sufficient to carry out thenecessary calculations. A complex network can be interpreted as a connection consisting of two real networks, one ofwhich transfers the real part of the complex signal and the other transfers the imaginary part. Nthis paper, a realization of complex filters using wave digital lattice filters is reported. relationbetween the real part and the imaginary part of its output fulfills the Hilbert transformation. As theattenuation response of a wave digital lattice filter meets some symmetrical requirements, a certain number of hardware can be saved. Explicit formulae and the Hilbert transformer table are given the design process is so simple that a pocket programmable calculator is sufficient to carry out the necessary calculations.