Filtenna with Frequency Reconfigurable Operation for Cognitive Radio and Wireless Applications

Abstract

A reconfigurable wideband monopole antenna is introduced in this paper for cognitive radio and wireless applications. The reconfigurability was achieved by four varactor diodes embedded in the band pass filter (BPF) structure which was integrated with the suggested antenna through its feed line. The simulated impedance characteristics coped with the measured ones after fabricating the suggested model with/without the reconfigurable BPF. Furthermore, the model achieved the desired radiation characteristics in terms of radiation pattern with acceptable gain values at the selected frequencies within the achieved frequency range (1.3–3 GHz).

Circularly polarized dielectric resonator based MIMO antenna for sub-6 GHz 5G cognitive radio applications

“…In available literature, very few works are present on MIMO antenna design for CR applications [15][16][17][18][19]. In [15], the MIMO antenna is designed for interweave mode only.…”

“…The antenna elements cannot work for sensing as well as communication purpose simultaneously, as the sensing wideband antenna works as ground plane for the communicating antenna. In [16][17][18][19], the antenna designs don't possess MIMO feature as well as works only for interweave CR. Also due to the use of microstrip radiators, overall gain of the proposed filtennas is reduced.…”

A Frequency Reconfigurable Folded Antenna for Cognitive Radio Communication

“…Some of the employed techniques to achieve multiband behaviour are a fractal structure [ 9 , 10 ], a complementary split ring resonator metamaterial [ 11 ], a window grille cross-structure [ 12 ], a meandered offset-feed [ 13 ], a split ring resonator and inverted F slots [ 14 ], a bowtie slot patch [ 15 ], and DGS and DMS [ 16 , 17 ]. An additional capability that can be possibly integrated with the multiband behaviour of the antenna is the reconfigurability which has a vital role in the accomplishment of cognitive radio applications, and it can be carried out using PIN diodes [ 18 , 19 , 20 , 21 ], varactor diodes [ 22 ], lumped capacitors [ 23 , 24 ], and RF MEMS [ 25 ]. In [ 18 ], a semi-circular patch was loaded onto a triangular radiator with two inverted L-stubs to achieve reconfigurability between two frequency bands using a pair PIN diode.…”

“…Two band notched frequencies were reconfigured at 3.5 and 5.2 GHz for WiMAX/WLAN interference mitigation capability. Four varactor diodes were used in the introduced filtenna for cognitive radio applications [ 22 ]. The varactors’ tunning ranges from 3 GHz to 1.75 GHz when applying voltages from 9 V to 0 V, respectively.…”