G-band (140-220-GHz) InP-based HBT amplifiers

Urteaga, M.; Scott, D.; Krishnan, S.; Wei, Ying; Dahlstrom, M.; Griffith, Z.; Parthasarathy, N.; Rodwell, M.J.W.

doi:10.1109/jssc.2003.815906

Cited by 18 publications

(4 citation statements)

References 12 publications

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“…Consequently, this frequency band is expected as a carrier frequency for wireless communications. [46][47][48][49] The materials developed herein should be useful as millimeter wave absorbing materials for unnecessary electromagnetic waves, which cause electromagnetic interference.…”

Section: Discussionmentioning

confidence: 99%

The synthesis of rhodium substituted ε-iron oxide exhibiting super high frequency natural resonance

et al. 2013

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In this study, we demonstrate a synthesis of rhodium substituted 3-iron oxide, 3-Rh x Fe 2Àx O 3 (0 # x # 0.19), nanoparticles in silica. The synthesis features a sol-gel method to coat the metal hydroxide sol containing Fe 3+ and Rh 3+ ions with a silica sol via hydrolysis of alkoxysilane to form a composite gel. The obtained samples are barrel-shaped nanoparticles with average long-and short-axial lengths of approximately 30 nm and 20 nm, respectively. The crystallographic structure study using X-ray diffraction shows that 3-Rh x Fe 2Àx O 3 has an orthorhombic crystal structure in the Pna2 1 space group. Among the four nonequivalent substitution sites (A-D sites), Rh 3+ ions mainly substitute into the C sites. The formation mechanism of 3-Rh x Fe 2Àx O 3 nanoparticles is considered to be that the large surface area of the nanoparticles increases the contribution from the surface energy to Gibbs free energy, resulting in a different phase, 3-phase, becoming the most stable phase compared to that of bulk or single crystal. The measured electromagnetic wave absorption characteristics due to natural resonance (zero-field ferromagnetic resonance) using terahertz time domain spectroscopy reveal that the natural resonance frequency shifts from 182 GHz (3-Fe 2 O 3) to 222 GHz (3-Rh 0.19 Fe 1.81 O 3) upon rhodium substitution. This is the highest natural resonance frequency of a magnetic material, and is attributed to the large magnetic anisotropy due to rhodium substitution. The estimated coercive field for 3-Rh 0.19 Fe 1.81 O 3 is as large as 28 kOe.

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Section: Discussionmentioning

confidence: 99%

The synthesis of rhodium substituted ε-iron oxide exhibiting super high frequency natural resonance

et al. 2013

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“…From these results, we can make the following observations, at low frequencies corresponding to operating wavelengths much larger than the device width, the gain increases steadily with increasing device widths. To confirm the theory defined for the transistor analysis by using the iterative method, we propose to determine the transmission and reflected coefficients of an tuned-amplifier designs in a transferredsubstrate HBT technology contain a MESFET [9], the transistor used in the amplifier designs had emitter junction area of 0.4 lm 3 0.6 lm and collector junction dimensions of 0.4 lm 3 0.6 lm, the seven element of the intrinsic model are: [10]. The cell dimension of design is 0.6 mm 3 0.35 mm.…”

Section: Results and Illustrationsmentioning

confidence: 99%

A global electromagnetic modeling of an active microstrip structure

Yeddes

Zairi

Gharsallah

et al. 2007

Int J RF and Microwave Comp Aid Eng

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“…Content may change prior to final publication. Citation information: DOI 10.1109/ACCESS.2020.3044849, IEEE Access To find the approximation of the SNR formula in (15), we start from (7) and perform asymptotic expansion of the numerator and denominator with respect to variable γ in . To simplify the analysis we let Ξ(•) be a function that contains the gains, the nonlinearities, the beamforming vector w, and the random vectors V and D as follows,…”

Section: Appendix B Proof Of (9)mentioning

confidence: 99%