Broadband two-layer microstrip antenna

Dual frequency planar microstrip antenna

“…Dual frequency antenna can be realized in number of techniques [1][2][3][4][5][6][7][8][9]. Good overview are given by Maci and Gentili [1].…”

Analysis of L‐strip proximity fed rectangular microstrip antenna for mobile base station

“…And, a DR oscillator (DRO) is a cost-effective solution for achieving a high stable and low phase noise source in the microwave and millimeter wave range [3]. Generally, high stable signal source has been achieved by phase-locked type to meet the mentioned conditions [4].…”

“…However, their major drawback is narrow impedance bandwidth typically a few percent [1,2]. Several methods including the stacked patches [3,4], thick substrate [5], impedance matching network [6 -8], U-slot patches [9], the use of lossy materials [10], and by adding gap-coupled patches to the radiating and nonradiating edges [11][12][13][14][15][16], E-shaped patch [17] have been proposed. A broadband thick substrate patch antenna fed by L-shaped probe and meandering probe has been experimentally demonstrated [18 -20].…”

Wideband electromagnetically coupled coaxial probe fed slot loaded stacked patch antenna

“…Several approaches have been made to improve the bandwidth of the patch antenna, such as use of a thick or foam substrate, cutting slots or notches like U-slot, E-shaped, H-shaped patch antennas and two layer electromagnetically coupled stacked structures Bafrooei et al, 1999;Ansari, Ram and Singh, 2008;Chen et al, 1984;Ansari, Singh and Dubey, 2008;Svacina, 1992;Kumar et al, 1984 andSabban, 1983). Several dual frequency and wide band antennas have been reported using stacked structures.…”