Dualband pin-fed circulary polarised slotted cross patch

Image of the Dualband pin-fed circulary polarised slotted cross patch.

Patch antennas are popular for their well-known attractive feature, such as low profile, light weight, and compatibility with MMICs. Their main disadvantage is an intrinsic limitation in bandwidth, which is due to the resonant nature of the patch structure.

Modern communication systems (GPS, vehicular, WLAN, etc.), however, often require antennas with compactness and low-cost, thus rendering planar technology useful and sometimes unavoidable.

Dual-frequency patch antennas may provide an alternative to large-bandwidth planar antennas, in applications in which operation at two separate transmit-receive bands is required.