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Microwave Theory and Techniques, IEEE Transactions on

Issue 11 • Date Nov. 1988

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Displaying Results 1 - 13 of 13
  • Comments on "p-i-n diode attenuator with small phase shift" [with reply]

    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (113 KB)  

    For the original article see ibid., vol.36, no.4, p.789-91 (1988). The commenters point out similar previous works to that presented in the above named article by R.J. Baeten et al., and take issue with several points. In replying, the original authors note the oversight regarding the citation of these previous works but maintain the correctness of the points at issue.<> View full abstract»

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  • Millimeter-wave diode-grid frequency doubler

    Page(s): 1507 - 1514
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (616 KB)  

    Monolithic diode grid were fabricated on 2-cm2 gallium-arsenide wafers in a proof-of-principle test of a quasi-optical varactor millimeter-wave frequency multiplier array concept. An equivalent circuit model based on a transmission-line analysis of plane wave illumination was applied to predict the array performance. The doubler experiments were performed under far-field illumination conditions. A second-harmonic conversion efficiency of 9.5% and output powers of 0.5 W were achieved at 66 GHz when the diode grid was pumped with a pulsed source at 33 GHz. This grid had 760 Schottky-barrier varactor diodes. The average series resistance was 27 Ω, the minimum capacitance was 18 fF at a reverse breakdown voltage of -3 V. The measurements indicate that the diode grid is a feasible device for generating watt-level powers at millimeter frequencies and that substantial improvement is possible by improving the diode breakdown voltage View full abstract»

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  • Guidance or resonance conditions for strips or disks embedded in homogeneous and layered media

    Page(s): 1498 - 1506
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (620 KB)  

    The authors illustrate how the guidance or resonance conditions of strips or disks embedded in layered media can be formulated easily using a new notation. It is shown that, once the reflection operator of a reflecting medium is known, one can also find the guidance or resonance condition of this structure quite easily. Guidance or resonance conditions can also be found when the reflecting medium is interacting with another strip or disk. This is illustrated with the calculations of the guidance of a microstrip line with an infinite ground plane and with a finite ground plane. The results for the infinite ground plane case agree very well with previous calculations on these problems, while the results for the finite ground plane case are new View full abstract»

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  • Interperiod capacitance calculations for three-dimensional multiconductor systems

    Page(s): 1515 - 1520
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    An approach is proposed to facilitate the capacitance calculations for periodic three-dimensional multiconductor systems. Based on the Fourier transform technique, the approach requires only the conductors inside one period and solves the charge distribution in the spectral domain by the integral equation method. The resultant spectral capacitances are then inverse transformed to give the capacitances between any two conductors, which may even be inside different periods. The approach is applied to the capacitance analysis for connector pins in a packaging board design View full abstract»

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  • Simulation of optically injection-locked microwave oscillators using a novel SPICE model

    Page(s): 1535 - 1539
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (324 KB)  

    Optical injection-locking of GaAs field-effect transistor microwave oscillators has been examined experimentally as well as by using two different optical interaction models. An additional simulation program with IC emphasis (SPICE) circuit for observing small locking ranges is also described. This first-order interaction model which utilizes a standard version of SPICE produces predictions of injection-locking range in excellent agreement with measured results. These tools allow the oscillator designer to optimize the injection-locking performance by analyzing various circuit topologies and DC bias levels View full abstract»

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  • Thick circular iris in a TE11 mode circular waveguide

    Page(s): 1529 - 1531
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    The TE11-mode excitation of a concentric circular iris of finite thickness in a circular waveguide is analyzed by Galerkin's method with even and odd excitation. Agreement between calculated and measured dominant mode scattering parameters is generally within experimental accuracy View full abstract»

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  • A broad-band microwave superconducting thin-film transformer

    Page(s): 1521 - 1525
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (388 KB)  

    The design, construction, and testing of a broadband superconducting transformer based on a Dolph-Chebyshev distribution are described. The transformer is completely compatible with thin-film circuit topologies and allows access to 50-Ω coaxial launchers. The transformer is a taper that utilizes only one side of the substrate and features a coplanar waveguide to microstrip transition without the use of via holes. The taper provides a characteristic impedance transformation from 50 Ω to 2 Ω over a frequency range from 5 to 15 GHz. The taper provides a much larger bandwidth than a linear taper with the same length and impedance transformation View full abstract»

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  • Computer-aided design models for broadside-coupled striplines and millimeter-wave suspended substrate microstrip lines

    Page(s): 1476 - 1481
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (396 KB)  

    Models were derived from the results of conformal transformation on homogeneous stripline, the equivalence of the odd-mode with the quasi-TEM mode of covered microstrip line, and logarithmic regression of spectral-domain results. Effects of finite strip thickness have been taken into account. These models are fully compatible with the needs and trends of computer-aided and programmable-calculator-aided microwave and millimeter-wave integrated circuit design View full abstract»

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  • Temperature variable noise and electrical characteristics of Au-Ga-As Schottky barrier millimeter-wave mixer diodes

    Page(s): 1469 - 1475
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (616 KB)  

    The fabrication and characterization of gold-gallium arsenide Schottky-barrier diodes on molecular-beam-epitaxy (MBE)-grown epitaxial gallium arsenide intended for cryogenic millimeter-wave mixer applications is reported. The Schottky barriers were formed either by pulse plating or by in situ evaporation in the MBE system after the epitaxial growth. The equivalent temperature as derived from the current-voltage characteristic is considerably lower at high current densities and cryogenic temperature than for the more commonly used Pt-GaAs Schottky diode. Noise-generation mechanisms are investigated as a function of forward bias and temperature. At cryogenic temperature, a best equivalent noise temperature of 22 K was obtained at 4 GHz for a DC-biased diode View full abstract»

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  • Computer-aided design of microstrip filters by iterated analysis

    Page(s): 1482 - 1487
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    An iterative method for the design of microstrip low-pass elliptic function filters is described. The method, which is a direct extension of the work of H.J. Orchard (IEEE Trans. Circuit Syst., vol.CAS-32, no.11, p.1089-96, 1985), determines the microstrip line parameters that produce the same locations of the frequencies of transmission zeros and reflection zeros of an equivalent lumped-element prototype. Effects of the discontinuities at the junction are easily accounted for in the iteration. A design example is included, and an experimental seventh-order filter designed and constructed using the procedure gives measured results that agree closely with theory View full abstract»

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  • Reflection and transmission operators for strips or disks embedded in homogenous and layered media

    Page(s): 1488 - 1497
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (692 KB)  

    A notation is proposed to simplify the solution of scattering by strips and disks. Vector Fourier transforms are used and a double dot product for inner products in an uncountably infinite dimensional linear vector space is introduced. Scattering by a strip or a disk is characterized using a reflection operator and a transmission operator that relate the continuum of scattered waves to a continuum of incident waves. After the reflection operator for a single strip or disk is derived, it is shown how the reflection operator for a strip or disk in the presence of another reflecting medium, e.g. a layered medium, can be derived. The scattering by N strips or disks in a homogeneous medium is also discussed. The reflection operator for an embedded strip or disk in a layered medium is then derived. The method can be generalized to N strips or disks embedded in a layered medium and to a slot or aperture View full abstract»

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  • A novel type of waveguide polarizer with large cross-polar bandwidth

    Page(s): 1531 - 1534
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (356 KB)  

    A wideband quarter-wave polarizer is presented having a rectangular cross-section, where all four walls are loaded with a dielectric or artificial dielectric. A much larger bandwidth compared to existing polarizers can be obtained without increasing the insertion loss. A polarizer so constructed was fabricated and measured. The polarizer had a differential phase shift within 90°±0.7° corresponding to 44 dB isolation, insertion loss below 0.06 dB, and return loss below -24 dB (VSWR <1.13) over the frequency band 10.95 to 14.50 GHz View full abstract»

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  • Design and fabrication of a nonradiative dielectric waveguide circulator

    Page(s): 1526 - 1529
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (356 KB)  

    A technique is described for constructing a high-performance nonradiative dielectric waveguide (NRD guide) circulator for use at 50 GHz. A mode suppressor, which serves to reduce unwanted modes to a negligible level, was devised and used to improve circulator performance significantly. A half-wavelength step transformer was installed at each port of the circulator to increase the operational bandwidth. The insertion loss of this circulator is less than 0.3 dB, and the 20-dB isolation bandwidth is about 2.6 GHz. Characteristics of the NRD guide circulator are analyzed based on an equivalent circuit representation. This analysis considerably facilitates the design procedure of the circulator View full abstract»

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The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design..

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