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Biomass material is getting importance thanks to the new developments done in the energetic sector. Quality control is of great interest to optimize its production. Moisture level quality control of the product is a key point in this sector. Therefore, taking advantage of the sensibility presented by THz waves to water, a viability study to control the water content in biomass material in THz frequencies...
This paper presents a 0.325-THz single-ended amplifier designed in a 28-nm FDSOI CMOS technology. The amplifier consists of four common-source gain stages and utilizes staggered-tuning along with inductive feedback (drain to gate) technique to boost up the gain over a wide frequency band. Having a total power consumption of 28 mW, the amplifier achieves a peak gain of 4.5 dB at 325 GHz. To the best...
We propose an image rejection type direct RF undersampling receiver. By using a direct RF I/Q sample and hold (S/H) circuits, and 90 degree power combiners in the digital domain, upper side band (USB) and lower side band (LSB) signals can be separated into two different (USB and LSB) output ports, therefore the image rejection functionality can be realized with half of the clock frequency of the conventional...
A summary of obstacles and solutions in the Universidad Politécnica de Madrid's CW-LFM (continuous-wave linear frequency modulation) imaging radar towards enabling real-time through-clothes threat detection with a compact system is presented. Image acquisition has been designed to permit a 2 fps (frames per second) video feed, and a newly developed signal-processing and image representation software,...
In this work we introduce a planar ground-free terahertz absorber suitable for large-area manufacturing. The lack of a ground plane in the absorber design may pave the way for frequency-selective response that is an essential requirement for invisible sensors and wave filters. The absorber is to be manufactured using state-of-the-art techniques of large-area printing, within the frame of a joint project...
A new waveguide-to-microstrip transducer has been developed using a polytetrafluoroethylene printed circuit board. This can fully cover the W-band (75 GHz-110 GHz), and the transmission loss is typically 0.77 dB. Combining the transducer with a 2nd-order harmonic mixer, a W-band frequency converter has been successfully developed. An up-conversion gain of −20.0 dB and down-conversion gain of −22.3...
In microwave remote sensing radiometers, calibration switches are needed in the application of the most internal calibration references. Very low insertion loss is beneficial in view of low receiver noise and good radiometric resolution (NEDT). Very low insertion loss can be achieved with ferrite junction switches. In developing millimeter wave ferrite junction switches, however, the small dimensions...
This paper describes the design and performance of compact integrated sub-millimeter wave heterodyne receivers for CubeSat platforms. Examples are given of receivers produced for 183 GHz and 874 GHz atmospheric science applications. It is described how these receivers further enable more sophisticated architectures for sub-millimeter nanosatellite receivers, including polarimeters and correlation...
A wide-locking range divide-by-4 static frequency divider for the mm-wave wireless applications is proposed. The capacitive-bridged inductive shunt peaking technique is investigated for widening the locking range and a compact layout area. The divider is realized in 65nm LP CMOS with a small area of 100μm × 160μm occupied. Measurement results show the present divider achieves an operation range percentage...
Phase shifting in a dielectric rod waveguide, loaded with a carbon nanotube layer illuminated with light from a tungsten lamp, was studied experimentally at the frequency range of 75–110 GHz. Close to a linear dependence of phase shift on the optical power intensity with almost independent behavior of the losses is observed The phase shift of 30 degrees with less than 1 dB extra loss for 1.26 mW/mm2...
Currently gap waveguide technology has revealed strong competitiveness for millimeter wave wireless applications. Specifically, this new topology of waveguide technology provides advantages of low loss, high quality factor and easy RF packaging. In this paper we present the design methodology of millimeter-wave transition from standard WR-15 rectangular waveguide to inverted microstrip gap waveguide...
The emerging millimeter-wave identification (MMID) technology is poised to exploit special advantages from operating in this frequency band and to circumvent the limitations of low-frequency RFID. In this work, the state-of-art of innovative techniques, which allow propelling the MMID technology in the front line of future wireless systems such as smart homes, are presented. Two recent developments...
In this paper we present the design, construction and characterization of a broadband Orthomode Transducer (OMT) for the new Band 2+3 of the Atacama Large Millimeter/Submillimeter Array (ALMA). The term Band 2+3 (67–116 GHz) refers to the recent proposal of covering current Bands 2 and 3 with a single dual-polarization broadband receiver. One of the key components of the future receiver is the polarizer,...
We are developing two prototype millimeter-wave radars at 95 and 183 GHz with a frequency-modulated continuous-wave (FMCW) architecture. The 95 GHz radar is intended to measure distributions and velocities of small particles in space, such as those ejected in cometary jets. The 183 GHz radar is to operate across the atmospheric water absorption line to perform humidity sounding inside clouds. Here...
This paper presents the design and measurement results of a W-band two-stage differential amplifier using transformers in 28-nm CMOS FDSOI. At 90 GHz, the amplifier achieves 13.8 dB gain, and the input and output return loss are −8.0 dB and −11 dB, repectively. The amplifier obtains +5 dBm saturated output power and 1-dB output compression point of 0 dBm at the centre frequency. From 85 to 95 GHz,...
We have developed a high speed gate switching type Ku-band CMOS amplifier for direct RF undersampling receiver. This amplifier will synchronize its d.c. power switch timing to the sampling clock of the direct RF undersampling receiver. For Ku-band VSAT application, we designed the sampling clock frequency of undersampling receiver as 600 MHz, therefore the power switching time (Turn-On Time) of less...
Thin beams with high spatial resolution are widely used in different measurement systems. This paper is devoted to a brief overview of the new and alternative to known approaches to the development of mesoscale systems for localization and transport of electromagnetic fields to the subwavelength region. Our approach is based on mesoscale dielectric particles of arbitrary three-dimensional shape. Its...
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