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In an effort to develop compact millimeter and THz wave radiation power sources, two types of traveling wave amplification concept with multi-beam have been studied using Pierce small signal analysis and particle-in-cell (PIC) simulation. Our prior work includes theoretical and numerical assessment on performance of the aluminum-nitride (AlN)-loaded multi-beam structure, indicating that the TM31-mode...
We present on-wafer and packaged measurements of a broad-band 170–280 GHz low noise amplifier based on high frequency InP HEMT technology. Discussed is the design and packaging of the CPW-based MMIC. Chip-to-waveguide transitions are monolithically integrated onto the MMIC to minimize losses at the transition within the split-block-waveguide housing. Packaged gain and noise figure are reported to...
We present the demonstration of the first traveling wave tube circuit fabricated using ultraviolet photolithography. The complete amplifier demonstrated over 60 W output power at 214.5 GHz with 15 GHz bandwidth in the small signal regime at 14 dB gain. A high-gain 233 GHz amplifier is now under development and predicted to reach over 100 W output power. We present several microfabrication advancements...
In this paper, we present the particle-in-cell(PIC) simulation results of a novel Ka-band ring-shaped microstrip meander-line slow-wave structure(SWS). This study shows that, this miniature millimeter-wave power amplifier is capable of delivering an average output power greater than WOW within the bandwidth from 28 to 38 GHz, when the beam voltage and the beam current are 11411Vand 200mA, respectively.
Two monolithic microwave integrated circuit low noise amplifiers for 67–116 GHz have been developed using the 50 nm metamorphic high electron mobility transistor technology of Fraunhofer IAF. Both amplifiers have been measured on-wafer at room temperature and one of them additionally in a waveguide module at an ambient temperature of 18 K. The average gain and noise temperature in the band 75–110...
A three dimensional (3D) linear theoretical modal for a sine waveguide sheet beam travelling wave tube is developed based on the field matching method. The dispersion curve for a 0.22THz sine waveguide slow wave structure is given. The effects of the beam parameters on the beam-wave interaction are discussed.
We present here a smooth walled horn design for the 64 to 128 pixel CHAI the heterodyne camera to be used as one of the first light instruments of the 25m sub-millimeter telescope CCAT. The horn design provides a very high gain that matches the f/6 optics at CCAT Nasmyth foci.
A 245 GHz sensor system for gas spectroscopy is presented, which includes a SiGe transmitter (TX) and a receiver (RX). The integrated local oscillators of TX- and RX-chips are controlled by two external phase-locked loops (PLL), whose reference frequencies are swept with constant frequency offset. The reference frequency of the TX-PLL is modulated for frequency-modulation spectroscopy. The performance...
In this manuscript, we present a new antenna design applied to the THz band, based on using a Vivaldi construction and theory. Design of pass band is 155–180 GHz, Using three-dimensional (3D) finite-integral time-domain simulations and Optimization. The antenna adopt the medium of polyethylene for reducing Power Loss and use choke groove for restrain back flow and reflection, the use of array to further...
In this paper we investigate the use of a photonic band-gap (PBG) structure in the design of a 94 GHz traveling wave amplifier. The proposed device has been designed with a large beam tunnel in order to accommodate a high current electron beam. CST Microwave Studio is used to solve the dispersion of the waveguide and simulate transmission of microwaves through a finite length section of the PBG waveguide...
The traveling-wave kinetic inductance parametric (TKIP) amplifier is a new amplifier technology capable of near quantum-limited sensitivity over a wide instantaneous bandwidth. Microwave frequency versions of these amplifiers, which are based on four-wave mixing in an NbTiN coplanar waveguide transmission line, have demonstrated high gain and noise corresponding to a few photons at several GHz. Their...
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