A photonic approach to generating two arbitrary and precisely π phase-shifted phase-coded microwave signals simultaneously with large frequency tenability in a single input case is proposed and demonstrated. The scheme is mainly consists of one dual-parallel Mach-Zehnder modulator and one polarization-maintaining fiber Bragg grating. After the laser inputs dual-parallel Mach-Zehnder modulator, the polarization-maintaining fiber Bragg grating and polarization beam splitter are combined to obtain two polarization orthogonal sidebands. One pair of side bands is modulated by the phase modulator and then coupled to the other pair. Finally, input them into two photodetectors to obtain high-frequency, low-noise encoded microwave signals. The simulation result shows that, by adjusting the frequency of the driving signal, a series of quadruplicated frequency phase-coded microwave signals of 5~100 GHz can be obtained. The recovered phase information and pulse compression ratio agree well with theoretical values, proving the good pulse compression performance of the proposed method.