A novel UWB reconfigurable filtering antenna design with triple band-notched characteristics by using u-shaped coppers

Abstract

<span>This paper proposed an UWB antenna with triple reconfigurable notch filters. By presenting there U-shaped coppers in the design, the potential triple interference in UWB applications can be rejected. Six PIN diodes are putted on the coppers to represent the OFF and ON tunable status in order to add reconfigurable characteristics to the UWB antenna. By using this ON and OFF tunable method, the current distribution of the proposed design changes and enables the antenna to have eight operation modes. The results prove that the proposed design can operate over the entire UWB frequency range (3.1 GHz to 10.6 GHz) and can filter out the target signals from the WLAN upper band (5.725 to 5.825 GHz), WLAN lower band (5.15 to 5.35 GHz) and X band frequency system (7.9 to 8.4 GHz) in one of the tunable configurations.</span>

Twelfth mode on-demand band notch UWB antenna for underlay cognitive radio

“…It is designed as a λg/4 slot depending (7). [17], [18]. Its length is carried out according to (8).…”

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“…In 1893, Hertz initiated the initial experiments on a UWB wireless communication system [1] and later it was authorized for commercial and research use by the FCC in 2002 [2]. The technology offers benefits such as high data rate, low power utilization, obstacle penetration, low costimplementation, and time resolution [3], [4] making it a promising technology for various applications. UWB technology has gained popularity for use in through-wall detection systems [5], [6], which use electromagnetic (EM) waves to detect targets behind walls.…”

Switchable bandstop to allpass filter using cascaded transmission line SIW resonators in K-band

“…As modern wireless and microwave systems have advanced towards a spectral cognitive system, there will be a need for further filter reconfiguration to allow the full potential of this system performance such as 5G technology [1]- [3]. Reconfigurable filters including switchable and tunable filters have been of great interest because they were designed to be versatile wireless systems that capable of occupying different bandwidths, responses, and frequencies [4]- [10]. Therefore, RF front ends that need to accommodate changes in the spectrum and provide adaptive filtering can include a switchable, reconfigurable and tunable filters.…”