Design of a 220 GHz Broadband Sub-Harmonic Mixer Based on Global Circuit Simulation Method

Cui, Jianhang; Zhang, Yong; Xia, Dejiao; Liu, Xiaoyu; Wu, Chengkai; Xu, Ruimin

doi:10.1109/icmmt.2018.8563835

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…In addition to the mixer designed by the SDM with functional unit circuits, another approach to the design of the harmonic mixer is the GDM, consisting of some basic circuit units and treating the SSB conversion loss as the optimization goal. Those basic circuit units mainly include H-Z L-Z TLs, full/reduced height rectangular waveguides and others, as described in our previous work [29]- [31]. The simple model of sub-terahertz harmonic mixer based on the GDM is illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

A 200–240 GHz Sub-Harmonic Mixer Based on Half-Subdivision and Half-Global Design Method

Cui

Zhang

et al. 2020

IEEE Access

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For the terahertz harmonic mixer, a design model based on Half-Subdivision and Half-Global Design Method (HS-HGDM) with a single functional unit is proposed. The single functional unit circuit of the mixer, such as LO or IF Low Pass Filter (LPF), is designed by Subdivision Design Method (SDM), and the rest circuits of the mixer are designed by Global Design Method (GDM). The harmonic mixer based on this model is characterized by simple circuit structure, low conversion loss, small circuit size and high stability. In this paper, an improved Compact Suspended Micro-strip Resonators (CSMRs) filter is developed for the IF part of sub-harmonic mixer. The remaining circuits consist of some basic transmission units, such as the High-Z Low-Z impedance Transmission Lines (H-Z L-Z TLs) applied for main circuit, and full/reduced height WR4.3/WR8 applied for providing RF/LO signal. In RF frequency range 200-240 GHz, a Single Sideband (SSB) conversion loss of 7.36±0.76 dB operating at IF frequency 1.8 GHz, and a Double Sideband (DSB) noise temperature below 1034 K with the LO power of 2-5 mW and the LO frequency of 107 GHz were achieved. This broadband sub-harmonic mixer operates at room temperature, which makes it applicable to sub-millimeter wave or terahertz wireless communication systems and imaging inspection systems. INDEX TERMS Terahertz sub-harmonic mixer, CSMRs filter, wireless communication systems.

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Section: Introductionmentioning

confidence: 99%

A 200–240 GHz Sub-Harmonic Mixer Based on Half-Subdivision and Half-Global Design Method

Cui

Zhang

et al. 2020

IEEE Access

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“…With the increasing operating frequency of terahertz mixers, the design of mixers based on traditional SDM faces problems due to smaller shield cavities and complicated stub matching structures. The GDM based on the mixer's overall performance was simply reported in our previous work [28], with the high-low impedance lines as basic circuit units. The GDM has obvious advantages on more optimization variables, simple circuit structures, small circuit size, high efficiency, and good performance.…”

Section: Introductionmentioning

confidence: 99%

A 220 GHz Broadband Sub-Harmonic Mixer Based on Global Design Method

et al. 2019

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A terahertz mixer is one of terahertz key components and widely used on terahertz wireless communication, remote sensing, aerospace exploration, and biomedical system. The performance of the terahertz mixer has a great effect on the entire terahertz transceiver system performance. This paper proposes a 220 GHz broadband sub-harmonic mixer based on global design method (GDM), which is different from the traditional subdivision design method of which the mixer circuit is composed of functional unit circuits. Instead, the GDM adopts the overall performance of the mixer (conversion loss) as an optimization goal. The continuous structures of the circuit are described by ideal transmission line models and waveguide models, meanwhile, the S-parameters of the de-embedded model are used to describe the discontinuous structures. The measured single-sideband (SSB) conversion loss is basically consistent with the simulation results, which verifies the accuracy and reliability of the GDM. When local oscillator (LO) frequency is fixed at 110 GHz, the measured SSB conversion loss is less than 10 dB with the average value of 8.1 dB from 198 to 238 GHz. The minimum conversion loss of the mixer is 6.35 dB at 207 GHz. The measured double-sideband noise temperature of the mixer is less than 924 K at an intermediate frequency of 1.6 GHz. The GDM has the characteristics with a wide frequency band, small circuit size, simple structure, low LO power, and stable performance, and can also be applied to other terahertz components. INDEX TERMS Terahertz components, terahertz sub-harmonic mixer, subdivision design method, global design method.

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“…In this paper, in order to further expand terahertz mixer's operating frequency band, reduce the circuit's size, and improve the performance, a 199 to 238 GHz broadband subharmonic mixer using a two‐stage reduced matching technology and Global Design Method (GDM) is introduced based on previous work . We redesign and reoptimize the mixer's matching variables.…”

Section: Introductionmentioning

confidence: 99%

Design of 199 to 238 GHz broadband subharmonic mixer combining two‐stage reduced matching technology with Global Design Method

Cui

Zhang

Liu

et al. 2019

Int J Numerical Modelling

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Terahertz technology is widely used in communications, radar, electronic countermeasures, precision guidance, and biomedical applications. In this paper, a 199 to 238 GHz broadband subharmonic mixer combining two-stage reduced matching technology with Global Design Method is designed, fabricated, measured, and analysed successfully. Compared with traditional single-stage reduced matching technology and Subdivision Design Method, the two-stage reduced matching technology is applied for terahertz mixer's Radio Frequency (RF) waveguide and Local Frequency (LO) waveguide, while the LO/Intermediate Frequency (IF) Low-Pass Filter of terahertz mixers is not necessary to design separately. The core of Global Design Method is that the whole mixer circuit, including LO/RF waveguide, is divided into basic transmission units, which match and filter circuit simultaneously with more optimization variables. When LO driven power is 3.1 mW, LO frequency is 108, 112 GHz. The measured singlesideband (SSB) conversion loss ranges from 7.84 to 12.4 dB with RF frequency 199 to 238 GHz. The measured double-sideband (DSB) noise temperature varies between 580 and 1059 K with LO driven power 2 to 5 mW. The multi-stage reduced matching technology and Global Design Method is general, effective, accurate, can reduce circuit size, simplify circuit structure, broaden frequency band, and can be applied for terahertz harmonically mixers.

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Design of a 220 GHz Broadband Sub-Harmonic Mixer Based on Global Circuit Simulation Method

Cited by 3 publications

References 9 publications

A 200–240 GHz Sub-Harmonic Mixer Based on Half-Subdivision and Half-Global Design Method

A 200–240 GHz Sub-Harmonic Mixer Based on Half-Subdivision and Half-Global Design Method

A 220 GHz Broadband Sub-Harmonic Mixer Based on Global Design Method

Design of 199 to 238 GHz broadband subharmonic mixer combining two‐stage reduced matching technology with Global Design Method

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