Design of quad-band antenna

A multi-branches antenna is designed with opening slot on the U-shaped patch. The antenna is with a lower frequency band and compact in size; and impedance matching of antenna has been improved by slotting on the trapezoidal patch of antenna. There are 1.530-1.6675GHz, 2.317-2.4828GHz, 2.911-3.740GHz and 5.106-5.694GHz frequency bands in this antenna. It is suitable for Wireless Local Area Networks, Worldwide Interoperability Microwave Access, and Global Position System applications.