High-Performance E-Band Continuous Transverse Stub Array Antenna With a 45° Linear Polarizer

Abstract

This letter presents a continuous transverse stub (CTS) array antenna with high aperture efficiency, low sidelobes, and cross-polarization characteristics over an <italic>E</italic>-band. The antenna consists of a full-corporate-feed 32-slot CTS array and a 45° linear polarizer. A multiple-aperture excited parallel-plate waveguide structure works as a linear source generator to generate the quasi-TEM wave with a uniform amplitude distribution over the whole operating band from 71 to 86\xa0GHz. The 45° linear polarizer contains two layers of slots, shifting the linear polarization from the principal <italic>E</italic>-plane (<italic>φ</italic> = 90°) to the intended <italic>E</italic>-plane (<italic>φ</italic> = 135°). The array antenna achieves the low cross polarization and sidelobe level (SLL) while maintaining high aperture efficiency. Measurement results show that the antenna has an aperture efficiency of over 74% with the peak gains of better than 37.9\xa0dBi over the whole <italic>E</italic>-band, while the far-field SLLs in the intended <italic>E</italic>- and <italic>H</italic>-planes approach the ETSI class IV envelope standard.