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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 +...
Two antenna systems, each composed of a single fed antenna and a plane with periodically arrayed elements (PE plane), are investigated. The PE plane of square strip loops, all having the same outer side length and the same strip width (homogeneous PE plane), forms a narrow beam in the direction normal to the PE plane, leading to a high gain. Subsequently, this normal beam is tilted by gradating the...
A low-profile curl antenna with an EBG reflector has a relatively wide input impedance bandwidth. Low-profile equiangular- and Archimedean-spiral antennas, each backed by an EBG reflector, have a wider input impedance bandwidth than the curl. A low-profile inverted F antenna above an EBG reflector radiates a tilted beam. An array composed of inverted F antennas combined with switching circuits has...
A wire composite helical-spiral (CHES) antenna fed from the central point of its bottom is investigated, where the number of helical turns is selected to be extremely small (one turn). The CHES is designed such that it radiates a circularly-polarized tilted beam under the condition that the diameter of the CHES is smaller than that of a corresponding tilted-beam spiral antenna. It is found that the...
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