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In this article, a new frequency notched ultra‐wideband microstrip slot antenna with an S‐shaped slot in the radiating stub and a pair of C‐shaped slots in the ground structure is proposed and experimentally studied. To increase the bandwidth, a pair of C‐shaped slots was cut in the ground plane that improves the bandwidth especially at the higher frequency and provides a wide usable fractional bandwidth from 2.9 to 14.4 (135%). To generate single band‐notch characteristics, we use the S‐shaped slot in the square radiating stub that with this design, a frequency notched band of 5.07–5.93 GHz has been achieved. The proposed antenna displays a good omni‐directional radiation pattern even at higher frequencies. The measured results reveal that the presented single band‐notch slot antenna offers a very wide bandwidth with notched band. The designed antenna has a small size of 20 × 20 mm 2 .
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Ojaroudi et al. (2011) studied this question.
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