| 摘要 |
<p>A beam scanning antenna for generating and aiming a directive radiation beam comprises a waveguide with a controlled artificial dielectric structure. The waveguide comprises periodically distributed capacitors and a fixed metallic grating layer on the walls of the waveguide. The artificial dielectric is connected to the grating layer by plural via holes and respective electronic switching devices are aligned with respective apertures in the grating layer such that, in use, the dielectric constant of the artificial dielectric layer is controlled by the switches. This changes the propagation constant for the guided wave which interacts with the apertures to produce a directive beam which can be scanned in the plane of the propagation of the guided wave. Switches such as PIN diodes, MEMS, tunable resonators or optical switches may be used to control the embedded capacitors for varying the dielectric constant of the artificial dielectric structure.</p> |
