Method for improving the gain uniformity of phased-array antennas
Publication Date: 2010-Sep-21
The IP.com Prior Art Database
Disclosed is a method that improves the gain uniformity of phased-array antennas.
Method for improving the gain uniformity of phased -array antennas
Phased arrays have been widely employed in radar and communication systems. Basically, phased arrays consist of multiple antennas, and multiple transmit/receive signals are combined coherently at a certain direction. Recently, there is also substantial interest in consumer electronic applications of phased arrays at millimeter-wave frequencies. These include point-to-point high-speed communications at around 24 GHz and 60 GHz, automotive radars at 77 GHz, and high-resolution imaging systems at 94 GHz.
In the design of phased-array antennas, it is inevitable that there is element-to-element gain variation due to the finiteness of the array and by a bounded ground plane. Energy coming in along the antenna feed line also excites a parallel-plate mode in addition to being coupled to the patch through the aperture. The parallel-plate mode propagates toward the edge and then radiates into the air. The main and edge radiations can interfere constructively or destructively depending on the phase difference between them.
The problem being address here is that, since each antenna element is placed on different location on a printed circuit board, there can be a considerable amount of element-to-element variation in antenna gain.
The disclosed invention provides a way of mitigating edge radiation, thereby improving gain uniformity across antenna elements.
In a preferred embodiment, an antenna ground plane wi...