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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...
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...
This paper presents the results from evaluation of suitable materials and ink properties for printing millimeter wave components. Dielectric parameters (relative permittivity and loss tangent) of various potential substrate materials are extracted from S-parameter measurements and simulations. Test samples have been printed over Polyethylene Terephthalate (PET) and Polyethylene Naphthalate (PEN) substrates...
Wave propagation in a dielectric rod waveguide loaded with a layer of silver nanowires was studied experimentally at millimeter wave frequencies. Then based on the measurement results, analytical calculations were used to estimate conductivity of the silver nanowire layer at millimeter wave frequencies. Numerical simulations based on the calculated conductivities were performed and good agreement...
Presented is an 89 GHz waveguide coupled direct detector based on ACST low-barrier Schottky diodes. Signal-to-noise ratio (SNR) values above 35 dB within 6 dB input power dynamic are achieved with high voltage responsivity of 3000 V/W and significant white and 1/f noise reduction. The fabricated detector is characterized and compared to simulation results, proving a high accuracy level of the design...
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...
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...
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...
This paper presents a 124 to 184 GHz single-ended amplifier designed in 28-nm FDSOI CMOS technology. The amplifier consists of four common-source gain stages and broadband matching networks for input, output and inter-stage matching employing slow-wave shielded co-planar waveguides. Having a total power consumption of 31 mW, the amplifier achieves a peak gain of 10.1 dB at 167 GHz and a 3-dB bandwidth...
In 5G communication system a high gain steerable phased array is desired. In this paper, a novel mm-Wave 256 element phased array system based on 8 element sub-arrays is presented. The sub-arrays are randomly tiled so the periodicity in the array is disrupted and significantly reduce the side lobe level (SLL). Four different rectangular sub-arrays: 1×8, 8×1, 2×4 and 4×2 are used to completely fill...
There is considerable interest in the development of composite materials used for reflectors within radio telescopes. To determine the surface reflectivity of composites at millimetre-wave frequencies, a measurement setup using a Fabry-Perot resonator has been developed at Q-Band (33–50 GHz). Fabry-Perot resonators are well known to give high-Q resonances and are suitable to measure low-loss materials...
The reliability of the equipment that will be used in the MetOp Second Generation satellites is crucial, since there are significant storage and in-operation times. To evaluate the reliability performance of these receivers ESA has set up projects to assess these issues in advance. The most critical parts within the receivers of the atmospheric sounder and imager instruments are identified to be the...
Since RF MEMS switches appeared more than 20 years ago, micromechanics has been attracting huge attention for enabling near-ideal microwave devices. MEMS switches and MEMS-switch based circuits have been through different development stages and are currently proving themselves commercially, among others for mobile-phone antenna tuners. However, micromachining can do much more than “just” two-dimensional...
Communication systems operating in indoor environments and at frequencies from 60 GHz up to the THz range may suffer severely from dynamic human blockage. Previous studies have shown the influence of a single person on a single (static) link. In this paper, a model for the prediction of a time-variant scenario for a simple conference room with a group of persons is presented. The presented model is...
This paper presents simulation and test data for a fixed-tuned ultra-high efficiency high power Schottky diode 180–200 GHz frequency doubler. The doubler was designed for an input power of 100–200 mW and tested producing flange-to-flange peak efficiency greater than 42.5% and output power greater than 80 mW in 185–195 GHz band. The 3 dB bandwidth was measured at more than 13%. In terms of output power...
Presented is the design, simulation and characterization of a high power 150 GHz Schottky based varactor doubler. The designed doubler works in the 67.5 GHz–82 GHz input frequency band with an input power of 25 dBm (315 mW), providing 19 dBm (82 mW) output power (more than 25% efficiency) in the 135 GHz–164 GHz output frequency band (20% relative bandwidth). The design is based on new high power diamond...
In this paper, a novel differential microstrip patch antenna (DMPA) is designed and used to feed a lens antenna for short range F-band MIMO radars. The DMPA is fed differentially by a pair of coupled lines. The antenna is connected via a differential impedance matching network to the differential output of the modules, eliminating this way the need of a balun in the RF frontend. The simulated antenna...
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