Reconfigurable antenna structure for a wideband cognitive radio

Wideband planar slotted radiating ground plane antenna for portable devices

“…Experimental data show a reasonably good agreement between the simulation and measured results. Metamaterial-based antennas have been extensively studied in recent years, mainly with the goal of reducing their overall size without sacrificing the other relevant radiation properties [1][2][3][4][5]. In all these applications, the quasistatic resonance at the interface between a metamaterial and a regular material implies that a filling ratio factor, rather than the total size of the antenna, determines the system overall resonance [1].…”

“…In this sense, it opens the path to substantial achievements for the purposes of size reduction. Applied to patch antennas, it was shown that a complementary split-ring resonators (CSRRs) loaded patch antenna achieves size reduction as well as slightly bandwidth improvement by altering the effective medium parameters of the substrate [4,5]. There are, however, still primarily fundamental issues at microwave frequencies, that is, narrow bandwidth and low gain.…”

“…By adding a slot to the ground plane, the antenna operating frequencies and bandwidth can be modified [3,4]. The other approach is to use frequency-tunable antennas instead of wideband antennas [5,6].…”