An Efficient Photomixer Based Slot Fed Terahertz Dielectric Resonator Antenna

Abstract

A slot fed terahertz dielectric resonator antenna driven by an optimized photomixer is proposed, and the interaction of the laser and photomixer is studied. It is demonstrated that in a continuous wave terahertz photomixing scheme, the generated THz power is proportional to the 4th power of the surface electric field of photocondutive layer. Consequently, the optical to THz conversion efficiency of the proposed photomixer has an enhancement factor of 487. This is due to the fact that the surface electric field of the proposed photomixer with a 2D-Photonic Crystal (PhC) superstrate has been improved from 2.1 to 9.9 V/m, which represents a substantial improvement. Moreover, the electrically thick Gallium-Arsenide (GaAs) supporting substrate of the device has been truncated to create a dielectric resonator antenna (DRA) that offers a typical radiation efficiency of more than 90%. By employing a traditional coplanar strip (CPS) biasing network, the matching efficiency has been improved to 24.4%. Therefore, the total efficiency has been considerably improved due to the enhancements in the laser-to-THz conversion, as well as radiation and matching efficiencies. Further, the antenna gain has been improved to 9dBi at the presence of GaAs superstrate. Numerical comparisons show that the proposed antenna can achieve a high gain with relatively smaller dimensions compared with traditional THz antenna with Si lens.

Antennas and Propagation: A Sensor Approach

“…A slot-fed terahertz dielectric resonator antenna driven by an optimized photomixer is proposed in [ 1 ], and the interaction of the laser and photomixer is also studied. It is demonstrated that, in a continuous wave terahertz photomixing scheme, the generated THz power is proportional to the fourth power of the surface electric field on the photoconductive layer.…”

Csrr Loaded Graphene Inspired Ebg Based High Isolation Miniaturized Wideband Thz Dielectric Resonator Mimo Antenna for Nano/Optical Communication in 6g Iot and Bio-Medical Sensing Application

“…Also, a high isolation is achieved by designing twoport MIMO antenna with the proposed metal strip coated DR. Literature [10] proposed a dual band rectangular THz DRA based on graphene and frequency tunability achieved by varying chemical potential of graphene. An analysis of high gain graphene based circularly polarized dielectric resonator antenna (CPDRA) has been reported in [11] for THz applications.…”

Identification of Terahertz Link Modulation in Atmospheric Weather Conditions

“…However, wireless links at terahertz frequencies are more susceptible to absorption and to scattering effects by atmospheric weather and suffer more serious deterioration in link performance [4,5]. In order to offset this influence, methods based on high-power antennae [6], signal repeaters [7], and adaptive signal processing [8] have been proposed and proved to be effective. Modulation identification, as an important signal processing method [9], can recognize different link modulation formats based on the weight matrix of signal features and help to decrease the response time of the entire system finally.…”