Millimeter-wave (mmWave) applications, including 5G networks, satellite communications, and radar systems, require exceptionally precise and efficient antenna performance to counter the increased susceptibility to interference and signal attenuation at higher frequencies. At mmWave bands, challenges such as atmospheric absorption [1], multipath effects [2] and the limited transmitted power in communication systems [3], demand advanced antenna designs with broadband
high gain, high efficiency and stable performance to ensure a reliable and robust radio link. Therefore, achieving low
sidelobe levels (SLL) is essential to minimize interference from external sources and adjacent channels [4]. Minimized
SLL, combined with advanced beamforming techniques, enhances signal focus and directionality, reducing unwanted
noise and maximizing energy concentration in the desired direction, thereby significantly improving overall system
performance [5]. This study investigates the design and performance evaluation of a low-profile and compact, wideband, high-gain horn antenna array with reduced SLL and fixed beam steering, operating over the V-band frequency range (50-75 GHz). Leveraging the advantages of additive manufacturing, the primary objective is to fabricate the antenna array's complex structure using the precise and cost-effective metal binder jetting (MBJ) 3D printing technique. This approach has proven to be well-suited for such applications due to its precision, efficiency, and ability to rapidly produce durable components from various materials, enabling customization for specific frequency bands and environmental conditions [6].