Frequency reconfigurable antenna for cognitive radios with sequential UWB mode of perception and multiband mode of operation

Abstract

In this work, an UWB/narrow band reconfigurable elliptical-shaped monopole antenna for cognitive radio applications with sequential perception and operation modes is presented. The proposed approach consists in integrating a reconfigurable filter, in an UWB antenna ground plan, by the mean of four horizontal slots and integrated switches that allow inserting/removing/varying zeros and poles in the frequency response. By acting on the slot lengths in order to alter their resonance frequencies, the different switch configurations allow the antenna to switch between an UWB mode that could be used for the perception (sensing) and different narrowband modes, mono-band and dual-band, that could be used for the operation at 2.4 or/and 3.5 GHz. To validate the concept, an experimental prototype has been fabricated and a good agreement between the simulated and the measured S-parameters has been obtained. While the presented work uses the presence/absence of a perfect conductive strip (PEC) to model real switch operation, it is believed that the obtained results conjugated with previous work using real switches on a very similar structure allows validating approach.

Frequency reconfigurable substrate integrated waveguide (SIW) cavity F-shaped slot antenna

“…According to ( [17]- [19]) it can be observed that the Frequency reconfigurable antenna has been extensively employed in wireless communication system applications, especially in Cognitive Radio (CR). Nonetheless, microstrip patch antenna has been reported in the previous literature to suffer from design and biasing complexity, large size of antenna and switching techniques implementation [20]. This paper achieved small size comparing with study of ( [20]- [22] ), where the dimentions were (L = 84 mm, W= 84 mm, L = 70 mm, W= 100 mm and 66mm X 90 mm x 1.3mm respectively.…”