A low-profile and wideband transmissive polarization rotator is proposed in this article. The wideband performance is accomplished by utilizing a curved bowtie resonator. The proposed wideband design exhibits a simulated bandwidth of 129.07% for at least 90% cross-transmission coefficient. The operating bandwidth is from 22.8 GHz to 105.8 GHz and the structure thickness is 0.082 λ max , where λ max is the free-space wavelength at the lowest operating frequency. A comparison with previously reported wideband polarization rotator designs is performed to highlight the notability of the proposed design regarding the wideband performance and structure thickness. In addition, in-band notches are utilized within the wide operating band to accomplish a transmissive polarization rotator with multiple operating bands. Single and double notches are employed to achieve polarization rotator designs with dual- and tri