Pattern‐reconfigurable quasi‐yagi microstrip antenna using a photonic band gap structure

Reduction of active elements in agile EBG antennas using their second band-gap

“…However, the mechanically controllable beam antennas are difficult to be maintained, and smart antennas are usually expensive and need complex network designs. As an alternative to these conventional beam switching technologies, reconfigurable Electromagnetic Band-Gap (EBG) antennas [1][2][3][4][5] can be used. The beam switching can be obtained by creating defects containing discontinuous wires in a continuous-wire structure.…”

Fractal Hilbert microstrip antennas with reconfigurable radiation patterns

“…In Ref. 1, a pattern reconfigurable quasi-Yagi microstrip antenna was introduced, which could scan from Ϫ66°to ϩ63°in the antenna E-plane while maintaining the operating frequency around 9.65 GHz. Zhang et al [2] presented a simple linearly polarized pattern reconfigurable microstrip parasitic array, which was able to shift the radiation to three angles using four switched connections.…”

“…In the past few years, the electromagnetic scattering inverse problem for the imaging of dielectric targets has been addressed by using several different approaches (see, for example, [1][2][3][4][5][6][7][8][9][10][11] and the references therein). …”

Planar Bowtie Antenna With a Reconfigurable Radiation Pattern

“…Accordingly, in the last years several approaches for the design of antennas providing diversity functions in operating frequency [1,2,6], polarization [3][4][5] and radiation pattern [1,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] have been proposed. Among them, antennas able to modify their radiation pattern while preserving the working frequency and polarization are key components for improving the performance and security of MIMO (Multiple-InputMultiple-Output) architectures [5,9].…”

“…This shortcoming is overcome by switched parasitic arrays that obtain the pattern reconfigurability by means of parasitic elements of variable dimensions which alter the current paths [16,17].…”