Abstract
This study investigates the reflection characteristics of a composite Artificial Magnetic Conductor (AMC) surface consisting of multiple orthogonal gradient AMC surfaces arranged in a two-dimensional periodic pattern. The gradient AMC surface in this study consists of square metal patches of variable size printed on a grounded dielectric substrate. Due to the orthogonal placement of the gradient AMC surface, the incident energy of a plane wave normally incident on the composite AMC surface will be reflected into four major lobes away from the impinging direction. To achieve a systematical design, a simple formula based on array antenna theory was developed to determine the reflection pattern of the gradient AMC surface illuminated by a normal incident plane wave. A time-domain full-wave simulation was also carried out to calculate the electromagnetic fields in the structure and the far-field patterns. The scattering patterns of the structure were measured in an electromagnetic anechoic chamber. Results confirm the design principle and procedures in this research. Since such a composite AMC surface can be easily fabricated using the standard printed circuit board technique without via-hole process, it may have potential applications in beam-steering and radar cross section reduction.
Highlights
A perfect electric conductor (PEC) reflects an incident wave with an 180◦ phase shift, while a perfect magnetic conductor (PMC) can reflect the incident wave in phase
The current study presents an Artificial Magnetic Conductor (AMC) surface implemented using square metal patches printed on a dielectric slab backed with a metal ground plane
Due to the normal incidence and electric-field vector along the y-axis, the unit cell is a rectangular tube with the two PEC walls along the y-axis and two PMC walls along the x-axis, respectively (Fig. 1(a))
Summary
Reflector composed of simple interlaced pattern of doubly periodic square metal and dielectric patches was proposed for radar cross-section reduction.[6] another study presents an absorber consisting of an artificial magnetic ground plane with surface mount resistors interconnecting a textured surface of square patches.[7] Researchers have developed mechanical and electrical tuning methods for tunable AMCs (or high impedance surfaces) by adjusting the resonant frequency of the unit cell. This study designs a unit cell containing several sizes of patches with the gradient reflection phase distribution. Repeating this gradient unit cell forms a periodically gradient AMC surface.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
