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Three-Modes, Reconfigurable Filtenna System with UWB, WiMAX, and WLAN States for Cognitive Radio Applications


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DOI: https://doi.org/10.15866/irecap.v14i1.23912

Abstract


This paper presents a reconfigurable single-filtenna system with three different modes for cognitive radio applications. The filtenna has three independent ports for Ultra Wideband (UWB), WiMAX narrowband mode, and WLAN narrowband mode, respectively. Three PIN diodes (D1, D2, and D3) are attached within the filtenna system and are used to switch between the three different modes in order to achieve frequency reconfiguration. UWB mode for sensing purposes is produced by a monopole antenna and is excited by port P1, which is controlled by D1. The desired frequencies of the narrowband communication modes are achieved by using two narrowband bandpass filters. The 5.2 GHz WLAN narrowband mode is produced by a U-shaped filter. This mode is excited by port P2 and controlled by D2. The second-order rectangular open loop resonator creates the 3.5 GHz WiMAX narrowband mode, which is excited by port P3 and controlled by D3. The simulated (measured) impedance bandwidth covers the range 2.54–12 GHz (2.54–11 GHz) for the UWB mode, with a gain value of 4.89 dB (4.5 dB). The WLAN mode covers the simulated (measured) range 5–5.36 GHz (5–5.26 GHz) with a gain value of 2.24 dB (1.92 dB), and the simulated (measured) bandwidth coverage of the WiMAX mode is 3.33–3.84 GHz (3.15–3.72 GHz) with a gain value of 3 dB (2.65 dB). The mutual coupling values are less than -22 dB for all three modes.
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Keywords


Reconfigurable Filtenna; UWB Antenna; Narrowband Filter; WiMAX; WLAN

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References


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