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In this paper, a 620–690GHz sub-harmonic mixer using monolithic GaAs integrated schottky diodes is presented in order to remove the mismatch caused by manual assembly of the flip chip diode. The monolithic microwave integrated circuit integrates a Schottky anti-parallel diodes pair in a longitudinal configuration. We mostly analyzed the influence caused by diode position offset and conductive adhesive...
This paper describes the planar schottky diode based subharmonic mixers currently being developed at the EHF Key Laboratory of Fundamental Science of Universtity of Electronic Science and Technology of China. Hybrid and integrated GaAs Schottky diode based 330GHz and 420GHz subharmonic mixers are designed, fabricated and measured. Test results show that the minimum conversion loss of 330GHz monolithic...
A comprehensive study of 220GHz waveguide power divider has been presented in this paper, which includes a E-Y junction and a H-Y junction power divider. This research is developed for THz multi-channel array application, such as passive imaging system, aerospace remote sensing system, etc. Both the E-plane and the H-plane power divider shows the great simulation performance from 170GHz to 260GHz...
This letter presents the design of a wide band 8th harmonic mixer, using an anti-parallel pair of planar Schottky GaAs flipp-chip diodes fabricated onto a suspended quartz-based microstrip circuit. Simulations predict conversion losses are well below 23dB from 330 to 500GHz. The design offers an solution to simplify the local oscillator signal generation and realize the goal of low frequency conversion...
In this paper, we use suspended microstrip to design a 0.33 THz fequency tripler, in which a pair of Schottky varactor chips parallel is adopted. Considering the present processing technology, it's easy for the unbalanced structure to provide bias to the diodes without an on-chip capacitor, which is essential to the balanced tripler scheme. The tripler consists of a waveguide housing, a pair of quartz...
This paper presents the design and simulation investigation of a 850GHz low-loss subharmonical mixer based on GaAs Schottky barrier diodes. Our group analyzed the topology of subharmonic mixer, device modeling of Schottky diodes, the 3D electromagnetic passive circuits and the mixer circuitry with optimum performance. The antiparallel diodes pair is fabricated from China Electronics Technology Group...
This paper uses HFSS (High Frequency Structure Simulator) by Ansoft Crop. to simulate an iris filter with center frequency of 110GHz and with relative bandwidth of 10%. The simulation results show that the center frequency is 109.74GHz and the 3dB bandwidth is 10.01%. Over the entire passband, the return loss is better than 13.56dB. The filter presents a steep cutoff, the insertion loss at the frequency...
The letter presents a fourth-harmonic mixer based on planar schottky diode working at 330–500GHz. The result of simulation predicts that conversion loses well below 14dB from 369GHz to 477GHz with 6 dBm of local oscillator power. Therefore, the good performance of mixers in wide bandwidth and low conversion loss provides designers with a better choice.
This paper describes the design, simulation and measurement of a Schottky sub-harmonic mixer working around 370GHz. The device is based on an anti-parallel pair of planar Schottky diodes flip-chip mounted onto a single quartz-based microstrip circuit. The best DSB noise temperature of about 3500K is measured with LO at 184.5GHz. The performance of the mixer at room temperature and the liquid nitrogen...
In this paper, a terahertz wideband sub-harmonic mixer based on the Schottky anti-parallel diodes pair and MASTER technology is presented. The mixer circuit is fabricated on a 0.05mm quartz substrate including Schottky anti-parallel diodes pair, RF/LO transition, IF matching networks and filtering circuits. The diode circuit is fabricated on a quartz substrate directly by MASTER technology. The research...
We report on the design of a 440GHz doubler based on commercially available RAL four-anode GaAs Schottky varactor diodes. The whole circuit is constructed on quartz substrate. The circuit design, simulation and optimization of the frequency doubler are carried out by using HFSS and ADS. The simulation performance of the doubler exhibits the multiplication efficiency reaches at least 10% over the 436GHz–441GHz...
In this paper, the fix-tuned 220GHz and 425GHz TMIC membrane sub-harmonic mixers are presented. Simulated results for the 220 GHz mixer yielded DSB conversion loss and NF of 6.7dB and 2.9dB at room temperature, respectively. The optimized conversion loss of the 425GHz mixer is less than 7dB.
The paper presents the design and simulation investigation of a low-loss fixed-tuned subharmonically pumped mixer at 300–350GHz, utilizing GaAs Schottky planar diodes. The antiparallel diodes pair is from Rutherford Appleton Laboratory (RAL), flip-chip mounted on a 50μm-thick suspended quartz substrate. The simulation performance of the mixer exhibits a conversion loss below 10 dB over the range from...
Design and analysis of a terahertz frequency tripler whose band ranges from 106GHz to 114GHz are reported in this paper. The tripler uses single commercially available MA46H146 GaAs Flip-Chip multiplier varactor. The circuit design, simulation and optimization of the frequency tripler are carried out with HFSS and ADS. When the input power is 20dBm, the simulated conversion efficiency of the tripler...
A design approach of Lange coupler for Si-substrate monolithic microwave integrated circuits is presented for frequency range up to 170 GHz. A combination of odd- and even-mode impedance theory and 3D EM simulation is proposed to improve the performance of Lange coupler. The value of the even number of the strip lines is determined based on the even-mode impedance calculation according to the process...
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