1. Introduction of helical antenna
As a kind of Beidou/GPS antenna, the four-arm helical antenna is generally inlaid on a cylindrical ceramic substrate by four metal lines bent according to specific rules, without any grounding. It has the characteristics of a Zapper antenna as well as a vertical antenna. This ingenious structure makes the antenna have a gain of 3dB in any direction, and the pattern characteristics are good. The four-arm helical antenna has a full 360-degree receiving capability. When integrated into the navigator, the four-arm helical antenna can receive regardless of the position of the navigator, which is different from the use of a microstrip patch GPS antenna. The limitation of better reception.
2. Helical antenna characteristics
