This paper presents the design of a miniaturized 1 x 4 Antipodal Vivaldi Antenna (AVA) tailored for 5th generation (5G) communication applications. The proposed AVA, measuring 28.8 mm x 24 mm x 0.254 mm, is fabricated using Rogers RT5880 substrate. Initially, a 1 x 4 AVA array (AVA-A) with slots between antenna elements is designed, operating over three frequency bands (24.91 GHz to 33.18 GHz, 34.95 GHz to 36.58 GHz, and 38.34 GHz to 39.38 GHz) with gains ranging from 8.47 dB to 12.63 dB. The performance of AVA-A is further improved by incorporating corrugations, resulting in AVA-A with corrugations (AVA-AC). AVA-AC exhibits enhanced gain, bandwidth, and front-to-back ratio, providing nearly constant gain of 8.2 dB to 13.2 dB over the 24.04 GHz to 40.85 GHz frequency range, including key bands of the 5G communication spectrum (24.25 GHz to 27.5 GHz, 31.8 GHz to 33.4 GHz, and 37 GHz to 40.5 GHz). Moreover, AVA-AC demonstrates stable radiation patterns across its entire operating range, rendering it suitable for integration into 5G communication devices.