Abstract-Terahertz rectennas on flexible substrates based on one-dimensional metal-insulator-graphene diodes

 

Andreas Hemmetter,  Xinxin Yang , Zhenxing Wang, Martin Otto, Burkay Uzlu , Marcel Andree , Ullrich Pfeiffer, Andrei Vorobiev, Jan Stake, Max C. Lemme, Daniel Neumaier, 

https://arxiv.org/abs/2106.11679

Flexible energy harvesting devices fabricated in scalable thin-film processes are important components in the field of wearable electronics and the Internet of Things. We present a flexible rectenna based on a one-dimensional junction metal-insulator-graphene diode, which offers low-noise power detection at terahertz (THz) frequencies. The rectennas are fabricated on a flexible polyimide film in a scalable process by photolithography using graphene grown by chemical vapor deposition. A one-dimensional junction area reduces the junction capacitance and enables operation in the D-band (110 - 170 GHz). The rectenna on polyimide shows a maximum voltage responsivity of 80 V/W at 167 GHz in free space measurements and minimum noise equivalent power of 80 pW/Hz−−−√.

Abstract-Terahertz Dielectric Resonator Antenna Coupled to Graphene Plasmonic Dipole

Seyed E. Hosseininejad, Mohammad Neshat, Reza Faraji-Dana, Sergi Abadal, Max C. Lemme, Peter Haring Bolívar, Eduard Alarcón, Albert Cabellos-Aparicio

https://arxiv.org/abs/1801.03834

This paper presents an efficient approach for exciting a dielectric resonator antenna (DRA) in the terahertz frequencies by means of a graphene plasmonic dipole. Design and analysis are performed in two steps. First, the propagation properties of hybrid plasmonic onedimensional and two-dimensional structures are obtained by using transfer matrix theory and the finite-element method. The coupling amount between the plasmonic graphene mode and the dielectric wave mode is explored based on different parameters. These results, together with DRA and plasmonic antenna theory, are then used to design a DRA antenna that supports the TE112y mode at 2.4 THz and achieves a gain (IEEE) of up to 7 dBi and a radiation efficiency of up 70%. This gain is 6.5 dB higher than that of the graphene dipole alone and achieved with a moderate area overhead, demonstrating the value of the proposed structure.