A　novel　type　of　photonic　background-free　multiband　arbitrarily　phase-coded　microwave　signal　generator　with　power　fading　elimination　capability　is　reported.　An　x-polarized　phase　modulated　optical　signal　and　a　y-polarized　radio　frequency　(RF)　modulated　harmonic　single-sideband　(HSSB)　optical　signal　are　produced　based　on　a　dual-polarization　quadrature　phase　shift-keying　modulator　(DP-QPSKM).　After　polarization　modulation　to　intensity　modulation　conversion,　a　microwave　signal　with　arbitrarily　phase　encoding　in　multiple　frequency　bands　is　generated.　Benefiting　from　the　phase　modulation　state　of　the　driven　electrical　coded　signal,　the　generated　arbitrarily　phase-coded　signal　has　no　baseband　components.　Moreover,　the　equivalent　HSSB　modulation　ensures　the　system　can　realize　antidispersion　transmission　of　one-to-multi　base　stations　(BSs).　The　main　distinct　highlights　of　our　generator　are　multifunction.　The　proposed　single-modulator-based　photonic　scheme　can　achieve　phase　encoding　in　arbitrary　format　over　multiple　frequency　bands　and　transmit　over　long-distance　single-mode　fiber　with　the　elimination　of　power　fading　simultaneously.　This　work　is　pretty　promising　in　multiband　radar　systems　for　one-to-multi　BSs　transmission　and　can　increase　the　detection　range,　range　resolution,　Doppler　tolerance,　and　sensitivity　of　objective　recognition　of　radars.