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Design of A CPW-fed Tri-band Antenna with Rectangular Frames

A tri-band antenna is designed in this paper, which is with rectangular frames to form three operating frequencies, and fed by coplanar waveguide (CPW). This antenna covers the bands of wireless local area network and worldwide interoperability for microwave access services. The radiation patterns of the proposed antenna are omnidirectional at the center frequency of each working band. The results of measured reflection coefficient are indicated the designed antenna working very well.