Abstract
A triple-frequency patch antenna with coplanar waveguide (CPW)-fed structure is presented in this paper for simultaneously satisfying wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. The proposed antenna mainly consists by three radiating elements: Stub1, Stub2 and Stub3 with a defected ground plane for band broadening. By adjusting the lengths of the three Stubs, three resonant frequencies can be achieved and adjusted separately. The simulated 10 dB bandwidth for return loss is from 2.07 to 2.73 GHz, 2.89 to 4.35 GHz and 4.6 to 7.06 GHz, covering all the 2.4/5.2/5.8 GHz WLAN bands and 2.5/3.5/5.5 GHz WiMAX bands. Furthermore, the patch antenna has a simple planar structure and occupies a small size of about 20×37 mm2; including the finite ground CPW feeding mechanism. Good dipole-like radiation characteristics over the operating bands are obtained.
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