Silicon Waveguide Frequency Scanning Linear Array Antenna

Abstract

The design and experimental fiidinga of a novel approach for a relatively simple low-cost freqnency-scanning mifliiter-wave antenna are described. The antenna consists of a silicon dielectric redangular rod with periodic metalfic stripe perturbations on one side. The feasibility of electronically scanning through a range of angles by varying the freqnency fed into the silicon rod is shown. CafcuIations were made to determine the allowable physical size of the sificon rod in order to maintain a single fundamental mode of operation and the effect which Sk variations and perturbation spacing have on the angle of radiation and the range of angular scan for a given frequency shift. Efforts covered the freqnency range 55-100 GHs with specific points of intereat at 60,70, and 94 GHz. The reanhs of the experiments conducted are compared with the theoretical cafcrdations. I.

Periodic FDTD analysis of leaky-wave structures and applications to the analysis of negative-refractive-index leaky-wave antennas

“…9. Computational domain for the periodic FDTD analysis of the metalstrip-loaded dielectric LWA of [28] and [29].…”

“…A case study of interest is the metal-strip-loaded dielectric LWA, initially proposed by Klohn et al [28] and then analyzed in [29]. The latter reference follows the standard FDTD methodology of simulating a truncated periodic structure composed of 29 unit cells, in order to approximate the complex propagation constant of the infinite periodic one at an operating frequency of 80 GHz.…”

“…10. Time-domain evolution of the electric field within the unit cell of the metal-strip-loaded dielectric LWA of [28] and [29] for =k = 00:218 (fastwave mode). Fig.…”

“…11. Complex propagation constants for the metal-strip-loaded dielectric LWA of [28] and [29] calculated with the proposed method (periodic FDTD). 5000 time steps, the signal essentially follows the source excitation.…”

“…On the other hand, the proposed technique relies on PBCs, thus saving cells within the working volume and execution time. [28] and [29], with the number of the simulated unit cells, when the antenna is analyzed as a truncated structure (with Ansoft's HFSS), compared with the proposed method (periodic FDTD). …”