Double Crossed Planar Bow-Tie on a Lens Antenna at Terahertz Frequency for Imaging Application

We propose a new design microwave radiation sensor based on a selectively doped semiconductor structure of asymmetrical shape (so-called bow-tie diode). The novelty of the design comes down to the gating of the active layer of the diode above different regions of the two-dimensional electron channel. The gate influences the sensing properties of the bow-tie diode depending on the nature of voltage detected across the ungated one as well as on the location of the gate in regard to the diode contacts. When the gate is located by the wide contact, the voltage sensitivity increases ten times as compared to the case of the ungated diode, and the detected voltage holds the same polarity of the thermoelectric electromotive force of hot electrons in an asymmetrically shaped n-n+ junction. Another remarkable effect of the gate placed by the wide contact is weak dependence of the detected voltage on frequency which makes such a microwave diode to be a proper candidate for the detection of electromagnetic radiation in the microwave and sub-terahertz frequency range. When the gate is situated beside the narrow contact, the two orders of sensitivity magnitude increase are valid in the microwaves but the voltage sensitivity is strongly frequency-dependent for higher frequencies.

Download Full-text

Analysis and design of ring-resonator integrated hemi-elliptical lens antenna at terahertz frequency

Optics Communications ◽

10.1016/j.optcom.2012.03.028 ◽

2012 ◽

Vol 285 (16) ◽

pp. 3445-3452 ◽

Cited By ~ 7

Author(s):

Kumud Ranjan Jha ◽

G. Singh

Keyword(s):

Ring Resonator ◽

Terahertz Frequency ◽

Lens Antenna ◽

Analysis And Design

Download Full-text

Terahertz Frequency-Scaled Differential Imaging for Sub-6 GHz Vehicular Antenna Signature Analysis

Sensors ◽

10.3390/s20195636 ◽

2020 ◽

Vol 20 (19) ◽

pp. 5636

Author(s):

Jose Antonio Solano-Perez ◽

María-Teresa Martínez-Inglés ◽

Jose-Maria Molina-Garcia-Pardo ◽

Jordi Romeu ◽

Lluis Jofre-Roca ◽

...

Keyword(s):

Autonomous Vehicles ◽

Imaging System ◽

Near Field ◽

Wide Frequency Range ◽

Terahertz Frequency ◽

Terahertz Band ◽

Imaging Application ◽

Induced Currents ◽

Differential Imaging ◽

System Operating

The next generation of connected and autonomous vehicles will be equipped with high numbers of antennas operating in a wide frequency range for communications and environment sensing. The study of 3D spatial angular responses and the radiation patterns modified by vehicular structure will allow for better integration of the associated communication and sensing antennas. The use of near-field monostatic focusing, applied with frequency-dimension scale translation and differential imaging, offers a novel imaging application. The objective of this paper is to theoretically and experimentally study the method of obtaining currents produced by an antenna radiating on top of a vehicular platform using differential imaging. The experimental part of the study focuses on measuring a scaled target using an imaging system operating in a terahertz band—from 220 to 330 GHz—that matches a 5G frequency band according to frequency-dimension scale translation. The results show that the induced currents are properly estimated using this methodology, and that the influence of the bandwidth is assessed.

Download Full-text