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A novel triple frequency patch antenna for WLAN/WiMAX applications is proposed and investigated in this paper. The antenna proposed is composed of three radiating elements: Stub1, Stub2 and Stub3. By adjusting the lengths of the three Stubs, three resonant frequencies can be achieved and adjusted separately. We present a microstrip patch antenna for worldwide interoperability for microwave access (WiMAX) standard at 3.5/5.5 GHz bands and wireless local area network (WLAN) operates at 2.4/5.2 GHz bands. This design results in a reduction in size and weight and allows integration in hand-held devices. Furthermore, nearly omnidirectional radiation patterns, reflection coefficient and gain over the operating bands have been obtained.

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To incorporate two different communication standards in a single device, a miniaturized dual-band planar monopole antenna is presented in this paper. The proposed antenna is formed by a CPW feed line and a rectangular ring monopole with a vertical strip. The designed antenna has a small overall size of 19 mm  36 mm  1.6 mm. A prototype of the proposed antenna which was fabricated and measured to validate the design shows a good agreement between the simulation and the experiment. The measured results indicate that the antenna has the impedance bandwidths of 650 MHz (2.30-2.95 GHz) and 2460 MHz (3.40-5.86 GHz) at the first and second bands, respectively with a reflection coefficient less than-10 dB covering all the WLAN bands (2.4/5.2/5.8 GHz) and WiMAX bands (2.6/3.5/5.5 GHz). In addition, the nearly omni-directional and bi-directional radiation patterns are also achieved in both Hand E-planes, respectively. It is also noticeable that a good antenna gain over both operating bands has been obtained. Therefore, this simple compact planar monopole antenna with multi-band characteristics is well suitable for WLAN and WiMAX wireless communication applications. Details of the proposed antenna design and both simulated and experimental results are analyzed and discussed.