With the development of global positioning systems, GPS antennas are gradually being known and used, not only in the professional or commercial fields, but also the professional or commercial fields. For transportation fest, technology exploration, and many consumer products, such as mobile phones and personal data assistant (PDA) devices, GPS but-in antennas are one of the GPS antennas, which into include flat-screen antennas and four-am spiral antenna。

1. Flat Plate Antenna The flat GPS built-in antenna is composed of one or more metal sheets, it can be round, square, rectangularwise a copper printed circuit board and the most common shape is a block junction. Because it can be made small, it is suitable for aerospace and personal handheld applications. Because of its durability and relative ease of manufacture, it has become the most widely used type of antenna.