Design and Analysis of Corrugated Antennas Based on Surface Susceptance of a Single Cell of Corrugation

In this article, a simple approach to design and analyze corrugated antennas is proposed that estimates their general radiation performance. Based on the analysis of a unit cell of the corrugated structure, the relationship between resonant frequency, spectral bandwidth, and directivity of the antenna is analytically derived. This simplifies the design of a corrugated antenna in terms of the design of a single cell of the corrugation. Hence, optimization process for designing corrugated antennas is made time efficient. The effect of corrugation width, height, as well as the permittivity of the material within the corrugations on the unit cell's surface susceptance and antenna directivity is parametrically studied. Agreement is shown between the derived formulas for a unit cell and the full-wave simulation of the entire antenna. The study of one-unit cell of the corrugated antenna provides the substrate parameters for a desired band of operation. A 2-D corrugated antenna with three corrugations is designed and fabricated. The measured results show that a gain of 17.4 dBi can be achieved at the center frequency.