Antenna module and design method thereof
An antenna module is provided. The antenna module includes an antenna and an EBG element. The EBG element includes an EBG ground layer, a plurality of reflective units and a plurality of connection posts. The reflective units are arranged in a matrix, a gap is formed between the nearby reflective units, and the reflective units are corresponding to the antenna. Each connection post connects the reflective unit to the EBG ground layer.
1. An antenna module, comprising:
an antenna substrate, comprising a first surface and a second surface;
a feed conductor, disposed on the first surface;
an antenna ground layer, corresponding to the second surface, wherein an aperture is formed on the antenna ground layer, and the feed conductor feeds a signal to the aperture;
a plurality of reflective units, formed on the antenna ground layer, wherein the reflective units are arranged in a matrix, a gap is formed between the nearby reflective units, and the reflective units are located in the aperture of the antenna ground layer;
an EBG ground layer; and
a plurality of connection posts, wherein each connection post connects the reflective unit to the EBG ground layer.
2. The antenna module as claimed in claim 1 , wherein the antenna module is a circular polarization antenna module.
3. The antenna module as claimed in claim 1 , wherein each reflective unit has a reflection phase, and the reflection phase is −90°.
4. The antenna module as claimed in claim 3 , wherein each reflective unit is square.
5. The antenna module as claimed in claim 1 , further comprising an EBG substrate, and the EBG substrate comprising a third surface and a fourth surface, wherein the antenna ground layer is disposed on the third surface, the EBG ground layer is disposed on the fourth surface, and the connection posts pass the EBG substrate and connect the antenna ground layer to the EBG ground layer.
6. The antenna module as claimed in claim 5 , wherein the third surface faces the second surface.
7. The antenna module as claimed in claim 1 , wherein each connection post is disposed in a center of the reflective unit, and the connection post is cylinder.
8. The antenna module as claimed in claim 1 , wherein the second surface is connected to the antenna ground layer.
9. The antenna module as claimed in claim 1 , wherein only the feed conductor is disposed on the first surface.