A novel low-pass filter integrated ultra-wideband (UWB) antenna is presented in this paper for automotive internet of things (IoT)/UWB communications.The proposed filtering antenna comprises a UWB radiating element whose feedline is integrated with a low-pass filter section. The UWB antenna is constructed using a novel-radiating patch with curved edges to achieve reflection coefficient bandwidth extending from 2 to 13.2 GHz. A T-shaped low-pass filter with a 3 dB cutoff frequency of 3.85 GHz is designed and deployed adjacent to the feedline of the UWB radiator. The frequency selection is accomplished using PIN diodes, which enables feed selection making the antenna operate at two states, viz. narrow band (2.45 GHz), and UWB (2-13.2 GHz) states. Furthermore, a four-port vertically polarized MIMO antenna is constructed and the MIMO performance parameters are estimated. In both the operating states, the antenna offers an average gain (gain averaged over the four ports of the MIMO antenna) greater than 3 dBi throughout the operating bandwidth.A prototype MIMO antenna is fabricated and the results are presented. From the results, it can be inferred that the proposed antenna is suitable for high data rate IoT and UWB communications in the automotive environment.
This article proposes a dual band rejected double slits-based planar octagonal microstrip antenna for Ultra-Wideband (UWB) applications. The antenna built by an edge trimmed partial ground and an octagonal microstrip patch with a horizontal and an inclined rectangular slit. The slits are made to remove the interfering frequency bands WiMAX and WLAN from UWB band. The designed antenna without slits operates on the frequency range 2.78–10.78 GHz with a fractional bandwidth of 119% which includes the UWB frequency band 3.1–10.6 GHz. The antenna with diagonal inclined slit notches the band 4.4–5.83 GHz which excluded WLAN frequency range and shift the starting frequency of UWB band to the right from 2.78 to 3.26 GHz. The antenna with both horizontal and inclined slits further shifts the starting frequency from 3.26 to 3.619 GHz, eliminating the WiMAX band. The excluded bands show the VSWR value greater than 2 dBi whereas the rest of the band has less than 2 dBi. The proposed antenna results in nearly omnidirectional radiation pattern, 6.2 dBi peak gain and 85% radiation efficiency.
This paper proposes a passive filtering antenna for ultra-wideband (UWB) applications. The edge chamfering technique is adopted to construct the UWB antenna. The designed UWB antenna has a fractional bandwidth of 135%. A low-pass filter (LPF) is embedded on the feed line of the UWB antenna to convert it into a narrowband antenna that works at 2.45 GHz with 29.5% fractional bandwidth by removing the high-frequency components. The LPF is a transmission line with a stepped impedance configuration loaded with an H-shaped unit cell. The proposed filtering antenna is fabricated and tested. The measured results indicate the gain is >4.2 dBi and the radiation efficiency is >75%.
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