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This paper presents the design and characterization of an E-band 16 × 16-slot monopulse array antenna with full-corporate-feed fabricated by the commercially available batch process of diffusion bonding of laminated copper plates. The antenna is multi-layered, and consists of vertically-interconnected radiating elements, a corporate-feed circuit and a comparator. It has four input ports for different excitations. Sum and difference beams in different cut-planes for monopulse operation can be generated. The antenna has a quasi-planar profile, and a total size of 13.31 λ0 × 13.31λ0 × 1.52λ0 (λ0 is the wavelength at the design frequency of 78.5 GHz). The antenna demonstrates a wide operation bandwidth of 17.2 (70–87.2) GHz for VSWR < 2. At 78.5 GHz: 1) for the sum beam, there is a 32.6-dBi realized gain (83% antenna efficiency) and a 33.3-dBi directivity (95% aperture efficiency); 2) for the difference beams in the E-, H-, 45◦-, and 135◦-planes, the null depths are −53.0, −58.0, −57.8, and −65.6 dB, respectively. Across the full operation band where the sum main-beam and difference null are able to consistently point at the boresight, the antenna also demonstrates excellent performance in terms of high gain, high efficiency, high isolation, low cross-polarization, and distinguished monopulse capability. key words: E-band, waveguide slot antenna, millimeter-wave antenna, monopulse array antenna, comparator, diffusion bonding

Plate-Laminated Waveguide Monopulse Slot Array Antenna with Full-Corporate-Feed in the E-Band