Abstract
In this article, a novel microstrip antenna offering four operation bands to WiMAX (3.3–3.7 GHz), INST (4.5–4.8 GHz), downlink of X-band satellite communication (7.25–7.75 GHz) and X-band (8–12 GHz) is studied. The ring string-shaped radiator in the antenna consists of a circular ring patch and three elliptical rings of different sizes contributing to quad-band characteristics. The proposed antenna is fabricated on a FR-4 substrate with volume of 16 × 24 × 0.8 mm3. The measured reflection coefficient is lower than −20 dB and the peak gains are higher than 1.58 dBi at the center frequency of each operating bands. There is a high consistency between the measured results and the simulation results. It indicates that the idea of this antenna is correct and the proposed antenna can suit for the four desired operating bands.
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