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Microwave and Guided Wave Letters, IEEE

Issue 6 • Date June 1995

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Displaying Results 1 - 9 of 9
  • A 60-GHz high efficiency monolithic power amplifier using 0.1-μm PHEMT's

    Publication Year: 1995 , Page(s): 201 - 203
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (322 KB)  

    We report the development of a V-band monolithic power amplifier based on 0.1 μm gate-length pseudomorphic HEMT's. The two-stage amplifier has demonstrated record performance at 60 GHz on the first design pass: 272 mW output power with 9.4 dB power gain and 24% power-added efficiency. The amplifier was designed for high-reliability communications applications, with passivation, good linearity and excellent thermal properties, and has been fabricated on 3-in. wafers with high yield and excellent uniformity-on one typical wafer, consistency of MMIC output power is better than /spl plusmn/0.5 dB with an associated total yield through RF test of 58%. View full abstract»

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  • Third-order intermodulation distortion in cascaded stages

    Publication Year: 1995 , Page(s): 189 - 191
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB)  

    The relation for intermodulation distortion (IM) levels in cascaded stages is based on the worst-case assumption that intermodulation products at the output of each stage combine in phase. However, because there is no apparent reason why IM products should always combine in phase, efforts are customarily made to discard this assumption. Using Volterra analysis, we show that, in certain cases, the IM products do indeed combine in phase, and the cascade relation gives an accurate, not worst-case, prediction of distortion View full abstract»

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  • Multi-slot 50-Ω antennas for quasi-optical circuits

    Publication Year: 1995 , Page(s): 180 - 182
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    CPW-fed multiple-slot antennas have been developed for active arrays and integrated antennas. This letter describes how the antenna can be engineered for a self-resonant 50-Ω input impedance for various substrate parameters, and the concepts are verified using a three-slot antenna on εr=2.2 substrate and a five-slot antenna on εr=9.8 substrate. These antennas have been integrated directly with commercial MMIC gain block chips without any matching networks to create a quasi-optical amplifier array View full abstract»

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  • A comparison of the Berenger perfectly matched layer and the Lindman higher-order ABC's for the FDTD method

    Publication Year: 1995 , Page(s): 192 - 194
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB)  

    Higher-order absorbing boundary conditions are compared to the recently introduced Berenger perfectly matched layer (PML) absorbing boundary conditions (ABC). Reflections caused by the ABC's are examined in both the time and frequency domains for the case of a line source radiating in a finite computational domain. It is shown that the PML ABC significantly reduces reflections from the truncation of the computational grid when compared to 7th order Lindman ABC's. Also, except for at low frequencies, higher-order absorbing boundary conditions are no better than 2nd order Mur absorbing boundaries View full abstract»

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  • Optically controlled spatial modulation of (sub-)millimeter waves using nipi-doped semiconductors

    Publication Year: 1995 , Page(s): 198 - 200
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (312 KB)  

    The use of a molecular beam epitaxy engineered InGaAs/GaAs semiconductor structure to quasioptically modulate a millimeter wave Gaussian beam using an optical control signal has been demonstrated. The RF transmission is modulated spatially by the optically generated excess carrier density. Low optical intensities are sufficient due to the long recombination lifetime achieved in the nipi-doped structure used. A modulation depth of more than 15 dB in transmission mode has been obtained at 100 GHz. Modulation has been measured up to 5 THz using a Fourier transform spectrometer View full abstract»

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  • Performance and optimization of Gunn self-oscillating mixer

    Publication Year: 1995 , Page(s): 177 - 179
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (180 KB)  

    Dependence of performance of a Gunn Doppler self-oscillating mixer on the oscillator loaded quality factor, bias voltage and bias circuit resistance is investigated theoretically and experimentally. The analysis is based on consideration of stability principle and average voltage-current characteristic of a Gunn oscillator. Location of the operating point of the best performance of a Gunn Doppler self-oscillating mixer is defined. Results of the work can be used for tuning a Gunn Doppler self-oscillating mixer View full abstract»

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  • Theoretical and experimental evidence of nonreciprocal effects on magnetostatic forward volume wave resonators

    Publication Year: 1995 , Page(s): 195 - 197
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    An unexpected nonreciprocal behavior is observed on Magnetostatic Forward Volume Waves (MSFVW) Straight Edge Resonators (SER's) using YIG films. The nonreciprocal effect is theoretically predicted by taking into account the demagnetizing effect of the DC biasing magnetic field when calculating the forward and reverse propagation constants of MSFVW inside the YIG film. Hence, a nonreciprocal scattering matrix of the MSFVW-YIG-SER coupled to its transducers is calculated. The measured values of the transmission coefficients agree extremely well with the predicted ones. They both present an important nonreciprocal phase behavior View full abstract»

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  • Cutoff frequencies of guiding structures with circular and planar boundaries

    Publication Year: 1995 , Page(s): 186 - 188
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (180 KB)  

    The paper presents a method of evaluation of cutoff frequencies of a guiding structure consisting of two eccentric circular arcs with edges shorted by conducting planes. Combination of conformal transformation and method of finite difference is used for the analysis. The general formulation is applied to the limiting cases of lunar guide and also the guiding structure of semicircular cross section with a semicircular dent along its diameter. Numerical data for TE and TM modes are presented for different angular separation between the shorting planes, distance between the centers and ratio of radii View full abstract»

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  • A fast recursive highly dispersive absorbing boundary condition using time domain diakoptics and Laguerre polynomials

    Publication Year: 1995 , Page(s): 183 - 185
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (236 KB)  

    The contribution presents a new implementation of the absorbing boundary condition for structures where traditional ABC's perform poorly because of high dispersion. The proposed approach consists in the application of time domain diakoptics combined with the expansion of the impulse response into series of Laguerre polynomials. The application of Laguerre polynomials allows fast recursive calculation of the convolutions required by diakoptics. The numerical cost associated with this approach is significantly lower than in currently used time diakoptics schemes View full abstract»

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Aims & Scope

This Periodical ceased production in 2000. The current retitled publication is IEEE Microwaves and Wireless Component Letters.

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