Design of a binary programmable transmitarray based on phase change material for beam steering applications in D-band
Résumé
This paper introduces the design of a reconfgurable transmitarray operating within the D-band
frequency range (110–170 GHz). The transmitarray unit cell is composed of three metal layers and two
quartz dielectric substrates. It achieves a 1-bit phase shift resolution through the alternating states of
two innovative switches integrated into the active transmitting patch of the unit cell. To address the
challenge of miniaturization in the D-band, compact switches compatible with the proposed unit cell
dimensions are introduced. These switches are constructed using phase change materials (PCM) that
change between amorphous and crystalline states when exposed to heat. The paper includes a fullwave simulation of the unit cell, demonstrating an insertion loss below 1.5 dB across a wide frequency
band of 27%. Additionally, a 10 × 10 elements transmitarray is synthesized using a numerical tool and
its theoretical results are compared to full-wave electromagnetic simulations for validation purposes.
The results indicate that by incorporating the proposed switches into the unit cell, the transmitarray
achieves promising reconfguration capabilities within the D-band. Moreover, the paper presents
the architecture of a command line designed to bias the PCM switches. Notably, this command
line represents a novel approach, as it enables individual biasing of each PCM switch using direct
current (DC). The infuence of these command lines on the transmitarray’s performance is thoroughly
investigated. Although there is a compromise in the 1-dB gain bandwidth, the overall behavior of the
transmitarray remains encouraging.
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