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Microwave Theory and Techniques, IEEE Transactions on

Issue 2 • Date Feb 1989

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Displaying Results 1 - 22 of 22
  • Finlines in rectangular and circular waveguide housings including substrate mounting and bending effects-finite element analysis

    Publication Year: 1989 , Page(s): 299 - 306
    Cited by:  Papers (8)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (564 KB)  

    The finite-element method is used to derive the dispersion characteristics and field components of dominant and higher order modes in finlines. The method is accurate and covers the metallization thickness, substrate mounting grooves, bending of the substrate, and arbitrary cross sections. Results for structures already obtained with other methods have been found to agree well with available data. As a new contribution, the effect of substrate bending on the propagation constant is studied. The dispersion characteristics for the dominant and higher order modes for bilateral finlines in circular waveguide housing are calculated. The field plots for all the modes are given View full abstract»

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  • Rigorous field theory design of millimeter-wave E-plane integrated circuit multiplexers

    Publication Year: 1989 , Page(s): 340 - 350
    Cited by:  Papers (38)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (728 KB)  

    The overall field theory designs of two types of quasi-planar millimeter-wave multiplexers utilizing low-cost, low-insertion-loss printed metallic E-plane filters are described. Very compact components are achieved by using E-plane filters printed on a common metal sheet which is directly integrated in the septate sections of an E-plane n-furcated split-block waveguide housing. The second configuration proposed extends the useful principle of waveguide H-plane slit-coupled manifold multiplexers to the case of millimeter-wave printed metallic E-plane filters. Based on the model scattering matrix description of suitable key building blocks, the rigorous simulation technique used comprises the complete multiplexer structure including the E-plane transformer or iris elements, the waveguide E- or H-plane junctions, and the filter sections View full abstract»

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  • p-i-n diode control devices in E-plane technique

    Publication Year: 1989 , Page(s): 307 - 316
    Cited by:  Papers (7)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (876 KB)  

    The status of the use of p-i-n diode control devices in the E -plane technique, especially in integrated finline configurations, is reviewed. The circuit topologies, operating principles, and design considerations for state-of-the-art switches, attenuators, and digital modulators are discussed, and typical performance characteristics are presented. The superior performance of these components confirms that finline is the appropriate transmission medium for the realization of millimeter-wave p-i-n diode switches and attenuators in the low-power regime (up to some 10 W of CW power), where beam-lead diode devices can be used. By properly matching these devices to their finline embedding network, excellent broadband characteristics can be achieved View full abstract»

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  • The design of millimeter-wave control components

    Publication Year: 1989 , Page(s): 317 - 323
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (684 KB)  

    The design of broadband high-performance control components covering the 18-40-GHz frequency range utilizing microstrip technology is described. Design considerations and experimental results are presented for high-speed single-pole, single-throw and single-pole, double-throw switches with 80- and 60-dB isolation, respectively. Design equations and experimental results are presented for a 3-dB quadrature microstrip reentrant coupler and for a nonreflective voltage-controlled attenuator with a dynamic range of 50 dB View full abstract»

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  • Oscillators and amplifiers in integrated E-plane technique

    Publication Year: 1989 , Page(s): 351 - 364
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1104 KB)  

    An overview is presented of solid-state oscillators and amplifiers realized in E-plane technology. The circuit topology, basic design procedures, and performance characteristics are described and compared. Gunn oscillators, IMPATT oscillators, transistor oscillators, injection-locked Gunn oscillators, and transistor amplifiers are surveyed. Gunn and transistor oscillators have been realized successfully for frequencies from 10 to 110 GHz, thus covering almost the entire frequency range suitable for E-plane technology. IMPATT oscillators are difficult to design and to reproduce in quasi-planar form because of the high impedance ratio that must be overcome by the circuit. E-plane FET amplifiers have been built for frequencies up to 60 GHz View full abstract»

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  • A quasi-planar FET amplifier in integrated finline and microstrip technique

    Publication Year: 1989 , Page(s): 429 - 432
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (324 KB)  

    The design and performance of a single-stage 20-GHz GaAs FET amplifier in a quasi-planar technology are described. The component includes a compact, wideband transition between the finline input and output ports and the microstrip impedance-matching networks for the transistor. By virtue of a novel bias network which includes a microstrip bandstop filter and a 50-Ω resistor, this transition provides unconditional stability even at frequencies below cutoff of the finline ports. The overall amplifier has a gain of 6 dB at 20 GHz, and a 3-dB bandwidth of 17% View full abstract»

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  • Circuit parameters for single and coupled microstrip lines by a rigorous full-wave space-domain analysis

    Publication Year: 1989 , Page(s): 421 - 425
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (420 KB)  

    A rigorous full-wave analysis is applied to determine the dispersion characteristics and the impedance matrix of coplanar microstrip lines. It is shown that the impedance definition based on the propagating power and the longitudinal current is the most appropriate one. Examples are given for the single strip, for two coupled strips, either symmetric or asymmetric, and for a three-strip configuration. Some attention is also devoted to the current profiles associated with each eigenmode View full abstract»

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  • Quasi-planar filters for millimeter-wave applications

    Publication Year: 1989 , Page(s): 324 - 334
    Cited by:  Papers (10)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (912 KB)  

    A variety of quasi-planar low-pass, bandpass, and bandstop filters suitable for millimeter-wave applications is reviewed. The emphasis is on ladder-shaped E-plane bandpass filters to highlight their advantages as well as limitations in terms of design, performance, and manufacturing. To extend their range of application it is suggested that E-plane filters be cascaded for better passband separation. A modified finline filter is presented to improve the performance and manufacturing of filters in waveguides below cutoff. It is shown that plated through-holes can simplify filter housing fabrication and that surface-metallized composite housings are a lightweight and low-cost alternative to metal housings View full abstract»

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  • The tapered slot antenna-a new integrated element for millimeter-wave applications

    Publication Year: 1989 , Page(s): 365 - 374
    Cited by:  Papers (133)  |  Patents (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (872 KB)  

    Tapered slot antennas (TSAs) with a number of potential applications as single elements and focal plane arrays are discussed. TSAs are fabricated with photolithographic techniques and integrated in either hybrid or MMIC circuits with receiver or transmitter components. They offer considerably narrower beams than other integrated antenna elements and have high aperture efficiency and packing density as array elements. Both the circuit and radiation properties of TSAs are reviewed. Topics covered include: antenna beamwidth, directivity, and gain of single-element TSAs; their beam shape and the effect of different taper shapes; and the input impedance and the effects of using thick dielectrics. These characteristics are also given for TSA arrays as are the circuit properties of the array elements. Different array structures and their applications are also described View full abstract»

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  • Computer-aided design of E-plane waveguide passive components

    Publication Year: 1989 , Page(s): 335 - 339
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    The newly developed numerical analysis method for the inductive discontinuities in rectangular waveguides is presented. It can be used to analyze the scattering properties of E-plane uniform conductor-dielectric inserts in rectangular waveguides. These inserts are of arbitrary cross section and number. The calculation accuracy and speed are improved by a combined analytical-numerical approach. Some practical applications are given demonstrating its engineering usefulness View full abstract»

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  • Overview of quasi-planar transmission lines

    Publication Year: 1989 , Page(s): 275 - 280
    Cited by:  Papers (30)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    A number of quasi-planar transmission lines are reviewed in terms of the general propagation characteristics including useful features, precautions in practice, and some design information. Transmission lines discussed here include coplanar waveguides, finlines, suspended stripline, and microslab waveguides. Attenuation characteristics of some of these lines are compared. The problem of discontinuity characterizations is discussed View full abstract»

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  • A novel exponential power combiner/divider

    Publication Year: 1989 , Page(s): 400 - 405
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (324 KB)  

    A simple and novel theoretical analysis for an exponential two-way power combiner/divider is developed. The proposed power combiner/divider's parameters, such as input impedance and reflection and transmission coefficients, are determined. The capacitance effect due to the finite thickness of the coupled-line conductor for both uniform and nonuniform transmission lines is found. The properties of the combiner/divider were tested experimentally, and experimental results are presented View full abstract»

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  • Coupled mode analysis of a finline

    Publication Year: 1989 , Page(s): 281 - 288
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (484 KB)  

    A theoretical analysis of a unilateral finline loaded with arbitrary inhomogeneous lossy dielectric material is presented. The rigorous coupled-mode approach is used. The electromagnetic field in the line is expressed in terms of the modes of a ridged waveguide, and the problem is transformed to a matrix eigenvalue equation. Approximate expressions are derived for investigating the properties of the fundamental mode in finlines loaded with dielectric slabs. Dispersion characteristics, the characteristic impedance, and the attenuation due to dielectric losses and the finite conductivity of the metal coating are computed for various line configurations. The numerical results are compared to data obtained by means of the spectral-domain method, proving the validity and usefulness of the proposed approach View full abstract»

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  • Double-sided MICs and their applications

    Publication Year: 1989 , Page(s): 406 - 413
    Cited by:  Papers (49)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (756 KB)  

    The basic concept and features are presented of double-sided microwave integrated circuits (double-sided MICs), which effectively utilize various kinds of transmission lines on both sides of a substrate. The fundamental circuits such as 180° hybrids (magic Ts) and many application circuits described here are very useful in developing microwave and millimeter-wave band equipment. The concept of the double-sided MIC technique is also suitable for application to monolithic MICs View full abstract»

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  • A FET amplifier in finline technique

    Publication Year: 1989 , Page(s): 425 - 428
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (316 KB)  

    The successful design and realization of a stable FET amplifier using the finline technique are presented. The circuit has been realized in integrated E-plane technology and features an input and output port in unilateral finline and a combined microstrip/coplanar bias circuit. The amplifier has been designed for 17-GHz operation and has a gain of 6 dB over a bandwidth of 1 GHz using a NE67300 FET View full abstract»

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  • Investigation of planar antennas for submillimeter receivers

    Publication Year: 1989 , Page(s): 375 - 380
    Cited by:  Papers (12)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    A frequency-scaled model of a tapered slot antenna has been investigated. The antenna consists of a dielectric substrate which serves as a carrier for a tapered slotline. The width and the shape of the slotline and the dimensions of the substrate (including the value of the permittivity) have been varied to investigate the radiation patterns. The result is a planar antenna with a symmetrical beam in the E and H planes and a beam efficiency of almost 50%. The substrate thickness is the most important limiting factor for scaling the model to submillimeter frequencies. Taking away parts of the dielectric substrate in the front area of the antenna allows a relatively large substrate thickness. The variations of the half-power beam width versus slot parameters, versus the dielectric thickness of the substrate, and versus the length and the width of the substate are presented. In addition the beam efficiency has been measured for various frequencies, and the radiation pattern has been calculated for comparison View full abstract»

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  • Reflection and transmission characteristics of an uncoincidental junction on rectangular dielectric waveguides

    Publication Year: 1989 , Page(s): 414 - 420
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (432 KB)  

    A novel approach to the analysis of an uncoincidental junction in a rectangular dielectric waveguide is presented. The boundary condition equations on the junction plane are presented through the tangential components of guided modes and radiation modes which are excited at the discontinuity. To obtain the reflection and transmission coefficients at the discontinuity, the equations are transformed into the spectral domain by the two-dimensional Fourier transformation. In the spectral domain, the orthogonal relationship between the guided and radiation modes is used to determine the reflection and transmission coefficients approximately. The parameters corresponding to the phase constant of the radiation fields in the spectral domain are defined by using an iterative calculation. The reflection and transmission coefficients are determined exactly. These coefficients are compared with 10-GHz band experiments. The analysis shows good agreement with experimental results View full abstract»

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  • Monolithic IMPATT oscillator characterization

    Publication Year: 1989 , Page(s): 393 - 399
    Cited by:  Papers (2)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (600 KB)  

    Two methods were developed to characterize the monolithic IMPATT resonator used in the design of the millimeter-wave oscillators. Although they are only good for discrete frequency points, the accuracy is much better than the method of de-embedding. The transmission resonance method can also be applied to other circuitry with high reflection coefficients, such as the matching circuit of a narrowband power FET, or HBT. The varactor method is very handy for in situ measurements. The drawback is that it is destructive and the accuracy deteriorates when the loss is high (a small arc). The experimental results are valuable for monolithic IMPATT oscillator design View full abstract»

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  • Dielectric resonators suitable for use in planar integrated circuits at short millimeter wavelengths

    Publication Year: 1989 , Page(s): 432 - 437
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (396 KB)  

    Experimental results are presented of planar whispering-gallery-mode dielectric resonators. The three-dimensional field pattern obtained by using finite-element techniques as well as measured resonant frequencies and quality factors carried out in the Ka (26.5-40 GHz) and 90-100-GHz bands is presented. The application to millimeter-wave components is discussed View full abstract»

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  • Asymmetrical finline for space applications using millimeter waves

    Publication Year: 1989 , Page(s): 289 - 298
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (640 KB)  

    A unilateral finline-the asymmetrical structure finline-is discussed. In addition to providing better electromagnetic isolation, this structure solves problems of mechanical and thermal resistance encountered with the traditional line. It provides better electromagnetic performances than the traditional line, while leaving an additional degree of freedom to obtain the characteristic parameters. Calculation software is used to simulate this type of structure, with results close to experimental measurements. The study was completed by producing two circuits: a 20 GHz bandpass filter and a balanced mixer View full abstract»

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  • Spectral-domain analysis of E-plane waveguide to microstrip transitions

    Publication Year: 1989 , Page(s): 388 - 392
    Cited by:  Papers (46)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (380 KB)  

    The spectral-domain technique and a residue calculus theorem are used to compute the input impedance of a microstrip transition to a rectangular waveguide. The transition consists of a printed circuit board inserted into a waveguide housing along the E-plane. The effects of the dielectric layer are considered in the present analysis. The behavior of the input impedance of the transition is studied with respect to the critical dimensions of the probe length and backshort location. Calculated results by the new formulation agree well with those computed using an integral equation and those measured at Ka -band frequencies View full abstract»

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  • Study of modal solution procedures for microstrip step discontinuities

    Publication Year: 1989 , Page(s): 381 - 387
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (552 KB)  

    Single and cascaded microstrip step discontinuity problems are studied. Modal formulations and numerical solution procedures are investigated in an effort to determine computationally efficient techniques for the solution of such problems. The enforcement of a model orthogonality criterion, the boundary enlargement/reduction concept, and convergence as a function of the number of modes and their accuracy are considered. Theoretical and experimental results are presented for the scattering parameters of several sample geometries 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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