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In this work, the concept of a solid-state amplifier based on the slow-wave interaction with drifting electron flow in a metal periodic structure is proposed for application in the low THz frequency range. Results of calculations at 330 GHz show the linear gain up to 50 dB/cm, including ohmic losses in the metal.
The following paper presents design and fabrication process of a high gain reflector antenna system carried out within the H2020 M3tera project. This project is focused on the development of a complete microsystem able to work as high rate communication link at D-Band frequencies. The paper presents design and fabrication aspects of two prototypes one fabricated by conventional techniques and the...
This paper presents an active 1:2 power divider built in a 35 nm InGaAs monolithic microwave integrated circuit (MMIC) technology. The circuit is based on a common-source transistor with an interstage matching at the drain connection to feed two parallel common-gate transistors. The measured gain is 3.6 dB with a 3 dB bandwidth of 100 GHz ranging from 200 to 300 GHz. Input and output return loss are...
In this paper, a patch antenna designed to operate in a UHF passive radar with a broadband about 19% is validated in a real semi-urban scenario. Novel techniques, such as using air gap as substrate and E shaped patch, were considered in the fabrication. The proposed solution is used in the surveillance acquisition system of IDEPAR demonstrator, a DVB-T based passive radar system, to evaluate the detection...
Molecular gases like ammonia (NH3) and deuterium oxide (D2O) can be used as active media for optically pumped terahertz lasers (OPTL). In this paper we present spectroscopic measurement of chosen NH3 and D2O lasing lines near 1 THz. Rotational-vibrational transitions are pumped by mid infrared quantum cascade laser (MIR QCL) which offers more precise tunability in MIR spectral range than standard...
A compact receiver MMIC for a 300 GHz wireless communication system has been developed in a 35 nm mHEMT technology. The circuit integrates an active frequency multiplier by three and a buffer amplifier for the LO signal, a single balanced, quadrature, fundamental resistive down-converter and an RF pre-amplifier. The chip measurements have shown that the receiver exhibits a conversion gain of −1 dB...
RAL Space and its project partner PRG are tasked with providing space-qualified heterodyne receiver front-ends operating between 165.5 GHz and 325 GHz for the Microwave Sounder (MWS), the Microwave Imager (MWI) and the Ice Cloud Imager (ICI) of the MetOp Second Generation (MetOp-SG) series of satellites. The preliminary design of the receiver front-ends is now complete. Extensive tests on performance...
A D-Band total power radiometer, implemented in an advanced 90 nm SiGe BiCMOS technology is presented. The passive imager front-end consists of D-Band LNA followed by a HBT-based power detector. The LNA achieves 30 dB gain over 28 GHz bandwidth with measured noise figure lower than 7.5 dB. The square-law power detector achieves responsivity of 14.5 kV/W and noise equivalent power (NEP) <1.5 pW/√Hz...
The high-order mode oscillation is studied in designing a four-cavity intense relativistic klystron amplifier(IRKA). The reason of the oscillation caused by high-order modes and a method to suppress this kind of spurious modes are found through theoretical analyses and the study on the influence of major parameters of a high frequency structure (such as, the oscillation frequency of cavities, the...
A G-band rectangular beam multi-gap Extended Interaction Klystron (EIK) with unequal-length gaps is proposed. The high-frequency features indicates that the designed model has wide frequency intervals with π mode, which has a good uniformity in field distribution with the maximum (R/Q)•M2. The PIC simulation shows a stable output power of 1378 W without oscillation in 218.9 GHz, with the efficiency...
A 0.14 THz wireless communication system that can transmit data with bit rate of 5 Gbps in real time over more than 21 km is developed. Solid-state power amplifier and vacuum electronic amplifier are cascaded to achieve nearly watts output power. An all solid-state receiver running in room temperature with equivalent noise temperature of 1100 K is used. An experiment over 21 km is carried out with...
This paper presents a fully-integrated ultrawideband receiver MMIC for high data rate communication at 240 GHz operating with a LO frequency of 60 GHz. The chip was fabricated in a 35 nm InGaAs-based metamorphic high electron mobility transistor technology. It comprises a frequency doubler followed by a buffer amplifier in the LO path, a LNA in the RF path and a subharmonic single balanced downconverter...
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