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A planar antenna consisting of four bent arms on a thin dielectric substrate is investigated. The arms are located symmetrically with respect to the coordinate origin, and each is made of a circularly polarized (CP) metaline that shows a negative propagation phase constant at the design frequency (2.45 GHz). The antenna height is extremely small: approximately 0.03 wavelength. By changing the feed...
A metaloop antenna that has a negative propagation phase constant for the current on its closed arm is proposed and investigated. A linearly polarized (LP) broadside radiation pattern is obtained at different frequencies below and above frequency fT, where the propagation phase constant is zero. In addition, it is revealed that the metaloop forms an LP dual-peak radiation pattern at different frequencies...
An inhomogeneous loop plate (iHomLP) is composed of M loops in the x-direction and (2N+1) loops in the y-direction. All the loops have the same peripheral length, and have different strip widths in the x-direction. It is found that, as the number of loops (2N+1) is increased, the gain increases gradually and reaches a maximum value. The frequency band of the VSWR is approximately 5.7% for M = 2N +...
Center-feed (or quasi-center feed) grid array antennas (GAAs) printed on a dielectric substrate (relative permittivity εr > 1) have been investigated [1]-[6]. These GAAs are composed of microstrip lines. The investigation reveals that the radiation beam is in the direction normal to the grid array plane and the polarization of the radiation is linear, coinciding with the direction of the short...
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