Bowtie Antenna with Modification to Reduce Radiation Arm Area and Use of Parabolic Reflector to Increase Power Dissipation in Antenna Coupled Microbolometer

Terahertz (THz) waves, ranging from 0.1 to 10 THz, possess unique properties, such as being able to penetrate nonconductive materials, making them ideal for nondestructive applications such as medical imaging and security detection. The high sensitivity of a THz waves detector is a crucial aspect in obtaining good performance from a THz system. The antenna-coupled bolometer technique is a candidate for providing a room-temperature detector and can be improved by taking advantage of the antenna design. A planar bowtie offers wideband bandwidth and easy coupling with a bolometer. This research proposes a modified bowtie antenna on the arm to centralize the electric field distribution and a parabolic reflector to improve gain and power dissipation in the bolometer. Simulations using CST Microwave Studio 2024 show that the modified antenna achieved a gain of 15.998 dBi, and, when combined with a bolometer, a maximum power dissipation of $4.13 \cdot 10^{-10}$ W. The enhanced configuration offers improved performance over standard designs, enabling practical applications in THz imaging and detection without cryogenic cooling.