Terahertz Conductivity of Copper Surfaces

Kirley, Matt; Booske, John H.

doi:10.1109/tthz.2015.2468074

Cited by 113 publications

(18 citation statements)

References 30 publications

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“…Accurate properties of the conductive layers also have to be known for reliable modeling of filter response, since conductivity of different inks varies in particular. For pure aluminum, the conductivity is a few times lower in the sub-THz band than at dc values [23]. Table I provides details of the estimated conductivity values of the printed surface for the three investigated techniques of Inkjet Brother Printer (IJ), Dimatix Material Printer (DM), and photolithography (PL).…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Sub-THz FSS Filters Fabricated by Inkjet Printing, Microprecision Material Printing, and Photolithography

Sushko

Pigeon

Donnan

et al. 2017

IEEE Trans. THz Sci. Technol.

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This paper reports a comparative study of sub-THz frequency-selective surface (FSS) filter performance in relation to its method of fabrication. Three techniques are considered: conventional inkjet printing, microprecision inkjet printing, and photolithography. The complete design process is presented highlighting steps from substrate selection through to electromagnetic modeling and finally broadband THz filter characterization. Electromagnetic modeling is performed using the CST full-wave frequency-domain solver. Experimental characterization of substrate material, ink, and final FSS designs is done both by THz timedomain spectrometry and quasi-optically at WR-10 and WR-3 waveguide bands using PNA-X vector network analyzer. The center frequencies for bandpass FSS filters are 100 and 300 GHz, which enables prospective utilization in a quasi-optical multiplier system.

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Section: Resultsmentioning

confidence: 99%

Comparative Study of Sub-THz FSS Filters Fabricated by Inkjet Printing, Microprecision Material Printing, and Photolithography

Sushko

Pigeon

Donnan

et al. 2017

IEEE Trans. THz Sci. Technol.

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“…Table I makes The designed HFS in section II was remodeled to make the simulations to approach to the experimental measurements. The ohmic loss caused by the surface roughness was studied by using an effective conductivity [30]. In the remodeled HFS, the background material was set to be a lossy metal with a variable σ.…”

Section: Fabrication and Cold Testmentioning

confidence: 99%

Design, Fabrication, and Cold Test of a High Frequency System for an H-Band Sheet Beam Travelling Wave Tube

Shu

Deng

Xie

et al. 2020

IEEE Trans. THz Sci. Technol.

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Shenzhen University (2018046).Abstract-The design, fabrication and cold test of a high frequency system (HFS) for an H-band (220-325GHz) sheet beam travelling wave tube (SB-TWT) is presented in this paper. The HFS was composed of a 90-period double-staggered grating waveguide and a pair of identical L-shaped couplers with Bragg reflectors and matching steps. The HFS was manufactured by Nano-CNC machining and its electromagnetic properties were measured by using a vector network analyzer. The measured S-parameters were in good agreement with the simulated ones, which predicted a 3 dB bandwidth of ~47.0 GHz. The maximum value of the measured transmission coefficient S21 was -4.9 dB and the in-band port reflection S11 was around -15.0 dB. Based on the cold testing-based HFS, simulations of the beam wave interaction predicted a stable output power of over 55.1 W in the frequency range of 230-280 GHz. In addition, the instabilities of the beam wave interaction were investigated in the simulation.Index Terms-high frequency system, interaction instability, terahertz wave amplification, sheet beam travelling wave tubes.

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“…In the simulation with CST MWS and ANSYS HFSS [30], we need to consider the influence of the surface roughness of the brass plate on its effective conductivity, . According to the experimentally verified Hammerstad-Bekkadal (HB) formula [31], [32], and value of 201 nm for brass, values at 342 and 1368 GHz can be estimated as 0.93×10 7 and 0.74×10 7 S/m, respectively. As the effective conductivity variation with frequency is small and has negligible impact on the simulated S21 performance, its value used in the simulations is chosen as 0.74×10 7 S/m.…”

Section: Design Fabrication and Test Of The Fsssmentioning

confidence: 99%

Investigation of Frequency-Selective Surfaces for a THz Gyromultiplier Output System

Liu

Ronald

et al. 2017

IEEE Trans. Electron Devices

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Abstract-The recent development of some high-power THz vacuum electronic devices calls for the application of space filters such as frequency selective surfaces (FSSs) and polarization dividers. This paper presents the comparative study of two types of FSSs for a THz gyro-multiplier output system, one with high-pass characteristic while the other one with low-pass functionality. Both FSSs are designed, fabricated and experimentally tested between 200 and 1600 GHz to verify their capability of separating the dual-frequency output from the gyro-multiplier. The high-power operation capability of the FSSs is also characterized by taking both the corona discharge and volumetric breakdown into consideration at the frequencies of interest. Based on the comparative study of the performance, the fabrication challenge and the high-power capability between the two FSSs, a generalized conclusion is given regarding the choice of the FSSs for high-power THz application.

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Terahertz Conductivity of Copper Surfaces

Cited by 113 publications

References 30 publications

Comparative Study of Sub-THz FSS Filters Fabricated by Inkjet Printing, Microprecision Material Printing, and Photolithography

Comparative Study of Sub-THz FSS Filters Fabricated by Inkjet Printing, Microprecision Material Printing, and Photolithography

Design, Fabrication, and Cold Test of a High Frequency System for an H-Band Sheet Beam Travelling Wave Tube

Investigation of Frequency-Selective Surfaces for a THz Gyromultiplier Output System

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