Compact tri-band T-shaped frequency reconfigurable antenna for cognitive radio applications

Abstract

This paper presents, new compact tri-band and broadband frequency reconfigurable antenna for cognitive radio applications. The proposed antenna consists of an Ultrawideband sensing antenna and reconfigurable communicating antenna at the same substrate. The sensing antenna is a UWB printed elliptical monopole antenna operates at frequency band from 2.72 to 23.8 GHz which can cover the entire UWB frequency band from 3.1 to 10.6 GHz and cover the broadband up to 20 GHz. The communicating antenna is a T-shaped frequency reconfigurable antenna operates on three bands of 7.925 GHz, 13.16 GHz, and 14.48 GHz under (S11≤-10 dB) with a fractional bandwidth of 14.55%, 6.2%, and 3.3% respectively. The proposed antenna used to operate in two modes one for cognitive radio applications to cover WiMAX, land, Fixed and Mobile satellite, Radar, and broadband applications. The frequency reconfigurability is obtained by using only one RF switch (PIN diode) for changing the operating frequency. The antenna overall dimensions are 42x30x1.6 mm3 printed on an FR-4 epoxy substrate with relative dielectric constant εr=4.3, loss tangent tan (δ)=0.002 and 50Ω microstrip line feed. The maximum obtained simulated gain is 8.5 dB at 13.16 GHz. The S11 is under -20 dB and coupling between the two antennas is less than -15 dB at the resonant frequencies.

A reconfigurable switching diode loaded patch antenna for S, C, X, Ku, and K bands applications

“…The researches [13]- [18] have used PIN diode to steer the radiation pattern of the constructed antenna to support various wireless applications. Jabber and Thaher [19] presented a frequencyreconfigurable antenna using a PIN diode. Tri-band has been offered to work for cognitive radio applications.…”

5G cognitive radio system design with new algorithm asynchronous spectrum sensing

“…In order to detect the active PUs, different spectrum sensing methods have been developed to provide more spectrum utilization for SUs without any interference with PUs [12], [13]. In 5G, there are wide frequency bands available for use because there is a wide range of these bands that are not used continuously [14], [15]. The throughput of CRNs can be dramatically improved by providing access to bands unused or exploited by authorized users [16], [17].…”

A multiband and wideband frequency reconfigurable slotted bowtie antenna

“…The configurations can be switched between the same mode or to another type of mode. For example, narrow-to-narrowband [3], narrow-to-wideband [4,5], multi-tomultiband [6][7][8][9][10], multi-to-wideband [11][12][13][14][15][16][17][18], wide-to-wideband [19] and wide-to-narrow-to-multiband [20,21] configurations have been proposed and discussed. However, in this paper, we only focus on configurations of narrow-to-wideband and multi-to-wideband.…”