Mo, Jingyan, and Wei Liu. “Design of a Broadband Inverted Conical Quadrifilar Helix Antenna and a Small GPS Helix Antenna”. New Insights into Physical Science Vol. 1 (June 29, 2020): 8-17. Accessed June 18, 2026. https://stm1.bookpi.org/index.php/nips-v1/article/view/1607.