Abstract
AbstractIn this paper, a novel design of miniature and broadband‐multiband coplanar waveguide‐fed planar antenna with a symmetric quarter‐circular ground plane is suggested to realize multiband with better performance. The experimental results show that the suggested antenna has achieved two bandwidths (S11 < −10 dB): the lower band from 2.34 to 2.42 GHz centered around the resonant frequency of 2.38 GHz and the upper broadband from 3.16 to 6.57 GHz resonating at 3.5 and 5.38 GHz, respectively. The bandwidths cover the two required bands: WiMAX and WLAN at the frequencies 3.5/5.5 and 2.4/5.2/5.8 GHz, respectively. All these three resonant frequencies show better impedance matching with convenient gain and high radiation efficiency; moreover, the radiation patterns in the H‐plane and E‐plane are omnidirectional and bidirectional, respectively. The patch antenna prototype is constructed on a simple substrate named FR4 epoxy and having total dimensions of 0.23λ × 0.14λ × 0.012λ, as λ is the free‐space wavelength at the lower resonant frequency. In addition, the resulting multiband antenna is a highly compact size and having a good performance, which makes it appropriate for wireless systems in diverse applications.
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