In this article, we propose a dual notched‐band antenna with 2 slits for ultra‐wideband (UWB) applications. The antenna consists of a circular ground plane and a patch radiator with having 2 slits and a folding arm. The patch with folding arm is used to achieve UWB band while a V‐shaped and a split ring‐shaped slit are used to eliminate the interference from WLAN and 5G band, respectively. The width and length of the slits are optimized to obtain the necessary band notch characteristics. The prototype of the antenna having a total size of 75 × 10 mm2 is fabricated. Simulated and measured results show that the antenna covers the entire UWB frequency ranging from 2.754 to 14.656 GHz (127%) for VSWR < 2 except at notched bands. Moreover, the antenna successfully notched the WLAN band (5.15‐5.825 GHz) and 5G band (3.4‐3.7 GHz) besides of providing a stable gain and radiation patterns.
This article presents the design of an ultrawideband antenna with quadruple band notch characteristic using negative permittivity unit cells. Quad notched band characteristics are achieved at desired frequency bands by etching four complementary split ring resonators on the modified rectangular patch, which is then validated by experimental results. The antenna has impedance bandwidth for voltage standing wave ratio (VSWR) <2 from 2.85 to 11.52 GHz, with a notched band characteristic in the sub‐6 GHz 5G (3.39‐3.82 GHz), IEEE 802.11a WLAN at 5.2 GHz (5.13‐5.40 GHz), IEEE 802.11a WLAN at 5.8 GHz (5.71‐5.91 GHz), and ITU 8 GHz (7.5‐8.61 GHz) signal bands. Furthermore, the antenna has a compact overall size of 40 × 30 × 0.81 mm3 with a stable radiation patterns.
In this study, a triple-band antenna that can be used in WLAN(Wireless Local Area Network) at 2.4 GHz, 5.8 GHz, and 5G at 3.5 GHz is fabricated. The proposed antenna uses a parasitic element to show the triple band, and the reflector is used at a distance of λ/4 from the antenna to reduce the Specific Absorption Rate(SAR). Its dimensions are 100×75×1.6 mm 3 and each parameter value is optimized for better performance and a lower SAR value. As a result, we obtained a bandwidth of 540 MHz(2.02~2.56 GHz), 390 MHz(3.39~3.78 GHz), and 1,210 MHz(5.56~6.77 GHz) based on the reflection loss factor of −10 dB. In addition, the SAR values of the antenna with reflector are observed to reduce below the SAR value of international standard.
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