Analysis of two aperture-coupled cavity-backed antennas

Analysis and equivalent circuit of aperture‐coupled cavity‐fed microstrip patch antenna

“…To check the validity of the theory, the antenna treated in [3] Figure 4 along with the published measured and calculated data [3]. Good agreement is observed.…”

“…The numerical method of moments (MoM) has been used to determine the input impedance of the antenna [3]. But this approach requires too much computation time and falls short of providing a physical understanding of the operating mechanism as well as some initial design data.…”

“…The coupling can be restored by increasing the aperture length (above cutoff), but this in turn increases unwanted back radiation. In order to solve this problem, an aperture-coupled cavity-fed microstrip patch antenna was proposed [3]. The cavity can be operated above cutoff to provide good coupling efficiency while maintaining a small slot in the feed side for minimal back radiation.…”

“…Left-handed materials (LHMs), as they are also known, have been widely investigated [2][3][4] and various structures have been experimentally realized at microwaves [5][6][7]. Such materials have been found to support backward waves and reverse some of the basic electromagnetic phenomena, such as Doppler effect and Cherenkov radiation.…”

“…Such materials have been found to support backward waves and reverse some of the basic electromagnetic phenomena, such as Doppler effect and Cherenkov radiation. It has been experimentally shown that using a material incorporated with thin metal wires [2] and split-ring resonators (SRRs) [3], negative permittivity and negative permeability, respectively, can be achieved, and proves useful to be applied for changing the guiding properties of an electromagnetic wave at microwave and millimeter-wave frequencies.…”