This work presents a small reconfigurable UWB (Ultra-Wide-Band) antenna with quad-band notches that may be used for multi-notching bands and anti-interference. It consists of a semi-circle engraved stepped-cut monopole antenna with two bevels. The slotted ground is also provided with two bevels to get enhanced bandwidth, from 3.1 to 11.67 GHz (116%). The two bevels also aid in achieving impedance matching, particularly over 9.9 GHz. To get notch characteristics covering the 5G band in 3.40-3.70 GHz (n78) and 4.84-5.70 GHz (n46), the patch is provided with L-shaped and Ladder-shaped stubs of quarter wavelength. A band-notch function is obtained at 3.88-4.32 GHz (n77, C-band), 7.10-7.61 GHz (X-band satellite downlink), and 8.04-8.68 GHz (ITU-8 GHz) by incorporating a half wavelength C-shaped slot, an I-shaped stub on the patch, and two RSRRs close to microstrip feed-line. The suggested antenna has eight PIN diodes that regulate several operating modes, allowing it to accomplish single/double/triple/quadruple band-notch characteristics. The size of the patch is 0.25λ x 0.37λ mm2 and printed on Rogers RT/duroid-5880 substrate. The simulated, measured, and equivalent circuit results match well with each other. It offers a stable gain and acceptable radiation pattern throughout the UWB band except for notch bands.
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Shrimal et al. (2024) studied this question.
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