Abstract
The paper puts forward a miniature microstrip antenna at the operating frequency of 2.4–2.5 GHz (Bluetooth) and 3.1–10.6 GHz (UWB). The omnidirectional radiation patterns can be obtained at the whole operating frequency band by cutting the ground conductor and adding a branch at the top of the antenna. Simulated results show that the antenna has attractive characteristics such as stable phase center, constant group delay, linear phase and good time-domain impulse response. Both the reflection coefficient and radiation patterns of the antenna are in good agreement with measured results. Experiment also shows that the cross polarization level is very low with flat gain. Consequently, the proposed antenna can well meet the requirements of wireless communication in both the Bluetooth and UWB bands.
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