A novel synthesis method for lumped-element bandpass filters is proposed on the basis of frequency-dependent coupling matrices, which can preserve moderate bandwidth response matching with matrix prototype better. The available element values resonators and inverters acceptable quality factor are determined by adjusting normalized slope parameters or reference susceptance parameters. To validate design approach, two third-order inline fractional 20% at a center frequency 3 GHz designed...

We present a novel four-port balanced configuration for Schottky diode-based doublers featuring improved power-handling capability and conversion efficiency. The circuit design includes two frequency doubler cells associated with compact functional networks, which provides unique phase differences those generated harmonic currents. So, this could achieve the inherent suppressions on odd-order harmonics as well fourth without any filter, guarantees efficient multiplying overcomes efficiency...

This paper presents designs of a single-stage quadrupler at 340 GHz based on Schottky varactors with 7 mW maximum output power. The diode model is invented to improve the accuracy design, which considers behaviors current-voltage (I/V), capacitance-voltage (C/V ), plasma resonance, self-heating effect, and skin effect diodes under deep driven situation into consideration. Compact suspended microstrip resonators (CSMRs) are adopted as harmonic rejection structure minimized length/width ratio...

This letter reports on the demonstration of a 204-232-GHz Schottky diode frequency tripler based novel balanced configuration, which provides superior power handling to traditional approaches. adopts utilizes symmetrical circuit achieve improved amplitude and phase balance, as well dc bias without any on-chip capacitor. Thus, this features capacity by multiple diodes better conversion efficiency. At room temperature, fabricated exhibits 22.1% peak efficiency for nominal input around 300-560...

The research on high power 170 GHz frequency doubler based the GaAs Schottky diodes is proposed in this paper. This basic cell developed with a 50-μm-thick, 600-μm-wide, and 2-mm-long AlN substrate thermal conductivity to reduce effect. Besides, combined has been fabricated improve capacity by factor of two. Great agreement achieved between simulated results electro-thermal model measured performances. At room temperature, 3 dB bandwidth single 11.8% over range from 160 180 pumping 150 330...

An room temperature low noise anti-parallel Schottky diode based 630–720GHz sub-harmonic mixer (SHM) is designed, built and measured. Intrinsic resonances in low-pass hammer-head filter have been adopted to prevent the LO RF power leak from IF channel, while greatly minimizing transmission line size. The consists of 15um quartz terahertz circuit 127um Al2O3 transformer circuit. improved lumped element equivalent model SBDs guarantees accuracy simulation. measurement indicates that with local...

This paper presents a compact hybrid G-band (170–260 GHz) heterodyne receiver module incorporating both Millimeter Microwave Integrated Circuits (MMICs) and Schottky diode-based circuit. An on-chip sextupler Low Noise Amplifier (LNA), along with Sub-Harmonic Mixer (SHM), are integrated into the demonstrated singular module, which is carefully designed arranged co-simulations in electromagnetic thermal domain. Through this methodology, terahertz fabricated volume of only 27 × 20 mm3. The...

Abstract A high‐efficiency frequency tripler operating up to 330 GHz is developed based on a novel quad‐port balanced configuration. The proposed circuit could inhibit the even‐order harmonics with great idler loops, leaving out lossy capacitors required in conventional triplers. Meanwhile, this topology employs two pairs of discrete Schottky diodes, which increase power‐handling capability by factor 2. In way, implemented four diodes mounted 30‐μm‐thick quartz substrate. At room...

Abstract This paper presents the design, fabrication and performance evaluation of a compact orthomode transducer (OMT) optimized for wideband communications. The OMT developed in this work features circular waveguide as its common port, ensuring direct compatibility with receivers such horn antennas, meanwhile enabling dual-polarization capabilities. operational frequency spectrum spans entire WR-4 band (170 GHz-260 GHz), achieving reflection coefficients surpassing 20 dB port isolation...

Abstract A vertical single-channel 0.65-THz solid-source interferometer (SSI) has been established at Experimental Advanced Superconducting Tokamak (EAST) for real-time electron density measurements and feedback. line array detection scheme was proposed successfully deployed on EAST to enhance the spatial resolution of SSI system. The utilizes an AlGaN/GaN High Electron Mobility Transistor (HEMT) detector, three channels line-integrated signals were measured. representative measurement...

Two four-pixel receiver arrays for operation in 340 and 250 GHz passive imaging system are presented. The millimeter-wave front-end components THz mixer achieved by the planar GaAs Schottky-barrier varactor to obtain good performance room temperature while lowering cost difficulty compared integrated circuit. discrete 340GHz 250GHz mixers have lowest DSB noise of 1020K 900K respectively within band. A broadband IF bandwidth, 20GHz, is adopted systems increasing received human body radiation...

This letter reports a balanced frequency tripler with novel configuration based on Schottky diodes featuring great conversion efficiency. A three-port E-probe has been proposed to achieve virtual grounding for radio (RF) signals and perfect dc. As result, this architecture could provide inherent suppressions even-order harmonics even without the lossy on-chip capacitor necessary in conventional approaches. An example of tripler, operating up 330 GHz, demonstrated configuration. At room...

This letter reports on a compact 110-GHz Schottky diode-based frequency doubler based 3-D stacked packaging which allows combining four discrete multiplying circuits. The proposed architecture could increase the power handling capabilities by factor of 4 compared with traditional balanced drastically reduced electrical path length. Meanwhile, whole circuit is composed two critical submodules can be evaluated separately to minimize manually assembly and fabrication imbalances. designed...

An analytical electro-thermal model for multianode Schottky diodes is proposed in this work. By characterizing the self-heating effects, temperature-dependent parameters including series resistance, ideality factor, and saturation current could be accurately extracted. means of self-consistent mapping between thermal electrical domain, eliminate errors conventional method, which makes assumption that each anode operates at same temperature even high-junction levels. This approach capable...

This paper introduces a design of novel FMCW imaging system, working at bands 170GHz and 340GHz the same time. system can be used in zero-IF super-heterodyne system. method reduce half local oscillator source There are two key components transmitter receiver, including output multiplier RF mixer. The last stage includes quadrupler doubler 170GHz. receiver sub- 4 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th_</sup> harmonic For experimental...

通过测量肖特基二极管的I-V和C-V曲线,建立等效电路模型.利用三维电磁场和谐波平衡仿真工具分别进行三维结构仿真和电路宽带匹配,最终实现混合集成方式的0.67THz谐波混频器设计.测试结果表明：混频器中心频率为0.685 THz,射频3 dB带宽为47 GHz,双边带变频损耗13.1~16 dB,在685 GHz双边带噪声温度最低值为11500 K.

Abstract A K‐band harmonic suppression enhanced sextupler with a chip dimension of 3 × 1 mm 2 using the 0.13 μm GaAs MHEMT process is presented. The configuration consists two transistors and quasi‐lumped bandpass filters. From measured results, conversion loss 3‐7 dB from frequency range 20.6‐26.3 GHz without any additional amplifier. fourth harmonic, fifth seventh eighth ninth show rejection over 28‐60, 34‐43, 12‐41, 25‐65, 20‐49 dBc, respectively.

A novel lumped-element Wilkinson power divider using LC-ladder circuits is presented. The proposed composed of parallel multi-section and an isolation resistor located between two output ports. To implement the described divider, GaAs integrated passive device (IPD) technology with a substrate thickness 100 um used. By adopting equivalent transmission line technique, covering frequency range from 2.5 to 5.5 GHz has been realized. measured results fabricated dividers exhibit good agreement...

In this paper, a 315-340 GHz frequency amplifier/multiplier chain (FAMC) based on MMICs and Schottky diodes with high output power is presented. To implement the proposed FAMC, V-band MMIC tripler 8-way amplifier array introduced in first stage, which can multiply drive input signal to next stage. Then, D-band balanced doubler Y-band utilized for second third stages, respectively. Besides, improve stability of each implemented different modules, integrated supply heat-dissipation system into...

Abstract A Schottky diode‐based 1 THz transceiver front end is designed, fabricated, and measured. The terahertz mixer tripler are fabricated with a 5 μm‐thick GaAs monolithic technology. Compact passive filter matching network designed to reduce the loss of transmission route. At 300 K ambient temperature, measured minimum double‐side band noise temperature conversion subharmonic &lt;5000 13 dB, respectively. self‐developed available pump source, maximum output power over 70 μW average from...

This paper reports the design concepts and micro-assembly process of a 140∼220GHz balanced frequency tripler based on discrete Schottky diodes. The proposed is determined without employment external DC bias, which consists two diodes in anti-series, <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$50 \mu\mathrm{m}$</tex> -thick quartz substrate, series waveguide networks. Due to great balance characteristics, features wide bandwidth high...

His letter introduces a design of quadrupler at 330GHz and doubler 165GHz based on one stage multiplier with anti-parallel Schottky varactors. For experimental verification, there are three DUT modules: two bands output passive network, high-Octave CSMRs low pass filter module. Measurement results show that: the maximum power is more than 5.9mW band 1.4mW band, driver about 200mW. The input 4-Octave (LPF) below 90GHz (S11<;-15dB), stop between 147GHz-500GHz (S12<;-15dB). Output network...