Patent ID: 9548526
Date: 2017-01-17
CPC Classifications: H01Q

Claim:
1. An antenna system, comprising: a ground plane; a microstrip-line coupler, having a first input port, a second input port, a first output port, and a second output port; a metal cover, disposed above the microstrip-line coupler, and coupled to the ground plane; and a main antenna, coupled to the first output port and the second output port of the microstrip-line coupler, wherein the metal cover is configured to reduce interference from the microstrip-line coupler and to enhance gain of the main antenna, wherein the metal cover has a first vertical projection on the ground plane, the microstrip-line coupler has a second vertical projection on the ground plane, and the whole second vertical projection is inside the first vertical projection, wherein the main antenna is a dual-feeding patch antenna which has a rectangular shape, and the first output port and the second output port are respectively coupled to two adjacent edges of the rectangular shape, and wherein the antenna system further comprises four shorting vias, wherein the metal cover substantially has a square shape, and wherein four corners of the metal cover are respectively coupled through the four shorting vias to the ground plane.