Miniaturized UHF three-element sequential rotation array antenna

This paper proposes a miniaturized UHF antenna with three sequentially rotated elements operating at 433MHz for Satcom applications. The main body of the antenna is formed by three sequentially rotationally arranged bent Planar Inverted-F Antenna (PIFA) elements, which helps dramatically reduce the size of the antenna. To drive the main body, a new compact feeding network based on spiral shaped Wilkinson power divider is also developed, achieving three-way power splitting and 120° phase shifting. In this way, a sequential rotation array antenna with compact size (Ø0.216λ
₀
), low cost, easy fabrication, and good performance is realized.