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# IEEE Transactions on Microwave Theory and Techniques

## Filter Results

Displaying Results 1 - 25 of 31
• ### On the realizability of the impedance matrix for lossy dielectric posts in a rectangular waveguide

Publication Year: 1988, Page(s):763 - 765
Cited by:  Papers (9)
| | PDF (320 KB)

The equivalent T-network for some lossy dielectric posts in a rectangular waveguide is found to have a negative resistance in the parallel arm although the realizability conditions for the impedance matrix are strictly satisfied. Furthermore, the reactive part of the same impedance is found to be a monotonically decreasing function of frequency. These difficulties are overcome in the case of symme... View full abstract»

• ### Comments on "Analysis of nonreciprocal coupled image lines" [with reply]

Publication Year: 1988
| | PDF (114 KB)

For the original article see ibid., vol.35, no.7, p.629-35, 1987. D.B. Sillars and L.E. Davis showed that nonreciprocal effects are present in a homogeneous waveguiding structure containing a gyromagnetic medium biased in the direction of propagation. The commenter points out that E. Jansen and C. Schieblich (ibid., vol.35, no.4, p.470-1, 1987) have previously shown that any longitudinally biased ... View full abstract»

• ### Corrections to 'A study of electric-field breakdown in E-plane lines at centimeter and millimeter wavelengths' (May 1987 502-509)

Publication Year: 1988, Page(s):795 - 796
| | PDF (135 KB)

Corrections are given for a previously published paper (ibid., vol.35, no.5, pp. 502-509, 1987). View full abstract»

• ### Three-dimensional finite, boundary, and hybrid element solutions of the Maxwell equations for lossy dielectric media

Publication Year: 1988, Page(s):682 - 693
Cited by:  Papers (86)
| | PDF (916 KB)

Finite, boundary, and hybrid element approaches are presented as numerical methods for computing electromagnetic (EM) fields inside lossy dielectric objects. These techniques are implemented as computer algorithms for solving the Maxwell equations in heterogeneous media in three dimensions. Algorithm verification takes the form of comparisons of test cases with analytic solutions. Computed results... View full abstract»

• ### Analysis of arbitrarily shaped two-dimensional microwave circuits by finite-difference time-domain method

Publication Year: 1988, Page(s):738 - 744
Cited by:  Papers (74)
| | PDF (536 KB)

A version of the finite-difference time-domain method adapted to the needs of S-matrix calculations of microwave two-dimensional circuits is presented. The analysis is conducted by simulating the wave propagation in the circuit terminated by matched loads and excited by a matched pulse source. Various aspects of the method's accuracy are investigated. Practical computer implementation of the metho... View full abstract»

• ### Design of combline and interdigital filters with tapped-line input

Publication Year: 1988, Page(s):759 - 763
Cited by:  Papers (76)
| | PDF (364 KB)

Explicit design equations for combline and interdigital filters with tapped-line inputs are presented. The equations are based on an equivalent circuit for a tapped-line input filter, derived from the open-wire-line equivalent circuit given by E.G. Cristal (ibid., vol.23, no.12, p.1007-113, 1975). Using the new equivalent circuit, explicit expressions are given for all parameters of the circuit. T... View full abstract»

• ### Beam propagation method applied to a step discontinuity in dielectric planar waveguides

Publication Year: 1988, Page(s):791 - 792
Cited by:  Papers (5)
| | PDF (168 KB)

The power transmission and the loss at an abrupt discontinuity in planar guides are calculated numerically using the beam propagation method (BPM) for the TE modes. Discontinuities include changes in core thickness and refractive index. Symmetric and asymmetric waveguides are considered. Comparison of results with those obtained by other techniques shows general agreement View full abstract»

• ### A multiloop concentric hyperthermia applicator with enhanced penetration depth

Publication Year: 1988, Page(s):676 - 681
Cited by:  Papers (4)
| | PDF (464 KB)

The electromagnetic field deposition into a three-layer cylindrical human-body model by a multiloop concentric hyperthermia applicator is investigated analytically. The multiloop radiator axis is taken to be coincident with the cylinder axis. A technique based on the method of separation of variables is used to determine the axisymmetric field in every point. In order to compute the imposed specif... View full abstract»

• ### Rigorous full-wave space-domain solution for dispersive microstrip lines

Publication Year: 1988, Page(s):731 - 737
Cited by:  Papers (40)
| | PDF (580 KB)

The eigenmode problem for the open microstrip line is analyzed in the space domain starting from the calculation of a dyadic Green's function in the spectral domain. The transverse and the longitudinal current are discretized using the method of moments. A point-matching technique is used to impose the boundary condition, i.e., zero tangential electric field, on the strip. The edge conditions at t... View full abstract»

• ### Large-signal time-domain simulation of HEMT mixers

Publication Year: 1988, Page(s):756 - 759
Cited by:  Papers (4)  |  Patents (1)
| | PDF (336 KB)

A large-signal HEMT (high electron mobility transistor) model and a time-domain nonlinear circuit analysis program have been developed. A systematic method to simulate HEMT mixers and design them for maximum conversion gain is presented. The transconductance-compression effect reduced the mixer's conversion gain at high frequencies. Simulation results from mixers designed to operate at 10, 20, and... View full abstract»

• ### p-i-n diode attenuator with small phase shift

Publication Year: 1988, Page(s):789 - 791
Cited by:  Papers (4)
| | PDF (196 KB)

A computer-aided design technique for minimizing spurious phase shift in microstrip p-i-n diode attenuators is presented. At 9 GHz, a spurious phase shift of 0.17°/dB attenuation has been realized at 15-dB attenuation. This is better than the previous reported value (H. Imai, 1974) of 1°/dB attenuation at comparable operating frequencies and attenuations. The diode mounting location and th... View full abstract»

• ### Composite inductive posts in waveguide-a multifilament analysis

Publication Year: 1988, Page(s):779 - 783
Cited by:  Papers (11)
| | PDF (384 KB)

A multifilament moment solution for the analysis of composite dielectric posts in rectangular waveguide is presented. This method permits the analysis of inductive posts composed of disparate regions, each with its own homogeneous complex permittivity. The solution uses the fields generated by sets of fixed-amplitude current filaments to simulate both the field scattered by the posts and the field... View full abstract»

• ### Exact solutions for rectangularly shielded lines by the Carleman-Vekua method

Publication Year: 1988, Page(s):659 - 675
Cited by:  Papers (8)
| | PDF (956 KB)

Exact solutions for the field of the TEM mode of rectangularly shaped round (or strip) conductors are obtained by solving linear, singular integral equations. There are no limitations on the dimensions or the proximity of the conductors to the shield. The authors consider only round conductors. The kernel of the integral equation in such problems is the Green's function G of a line source... View full abstract»

• ### A Monte Carlo method for the Dirichlet problem of dielectric wedges

Publication Year: 1988, Page(s):724 - 730
Cited by:  Papers (17)  |  Patents (1)
| | PDF (432 KB)

The Monte Carlo method considered can be used to numerically compute electrostatic potentials inside a closed surface where: (a) the potential on the surface is known, and (b) the dielectric constant inside the surface changes only on boundaries. A modification is proposed to previously used Monte Carlo methods to overcome problems presented by dielectric wedges. In addition it is shown how it can... View full abstract»

• ### A spectral iterative technique with Gram-Schmidt orthogonalization

Publication Year: 1988, Page(s):769 - 772
Cited by:  Papers (2)
| | PDF (260 KB)

Iterative schemes based on the minimization of the integrated square error are discussed. In each iteration a basis function is generated in such a way that it is linearly related to the residual error of the previous iteration. A complete orthogonalization of all these basis functions leads to an optimal convergent scheme for some choices of the basis functions. In order to reduce the computer st... View full abstract»

• ### Modal analysis of the gap effect' in waveguide dielectric measurements

Publication Year: 1988, Page(s):752 - 756
Cited by:  Papers (18)
| | PDF (424 KB)

In waveguide measurements on dielectric slabs, small air gaps between the guide walls and the dielectric sample are found to be capable of radically altering the complex reflection and transmission coefficients of the excitation mode. The modal-analysis representation is used to compute these coefficients for low-loss and high-loss samples with air gaps. The gap effect' is explained quantitativel... View full abstract»

• ### Two-layer dielectric microstrip line structure: SiO2 on Si and GaAs on Si: modeling and measurement

Publication Year: 1988, Page(s):785 - 789
Cited by:  Papers (5)
| | PDF (316 KB)

Further development is reported of the modeling of the two-layer dielectric microstrip line structure by computing the scattering parameter S21 derived from the model and comparing the computed value with the measured value over the frequency range from 90 MHz to 18 GHz. The sensitivity of the phase of S21, and the magnitude of the characteristic impedance t... View full abstract»

• ### Properties of shielded cylindrical quasi-TE0mn-mode dielectric resonators

Publication Year: 1988, Page(s):774 - 779
Cited by:  Papers (20)
| | PDF (484 KB)

Comparison of the Rayleigh-Ritz method and the mode-matching method for computations of quasi-TE0mn-mode frequencies and unloaded Q-factors of shielded dielectric resonators is presented. Rigorous bounds for the true quasi-TE0mn-mode frequencies are assessed. Influence of various parameters on the resonant frequencies, unloaded Q-factors, and the temperature... View full abstract»

• ### Design of transformerless quasi-broad-band matching networks for lumped complex loads using nonuniform transmission lines

Publication Year: 1988, Page(s):629 - 634
Cited by:  Papers (8)
| | PDF (472 KB)

A simple design method for transformerless and lossless quasi-broadband matching of a lumped RC load is presented by use of a parabolic nonuniform transmission line. The key idea in removing an ideal transformer from the matching network is based on impedance transformation of the nonuniform transmission line, whose mixed lumped and distributed equivalent circuit contains an ideal transformer. Ill... View full abstract»

• ### One-chip GaAs monolithic frequency converter operable to 4 GHz

Publication Year: 1988, Page(s):653 - 658
Cited by:  Papers (3)  |  Patents (5)
| | PDF (544 KB)

The frequency converter combines a feedback amplifier, a differential amplifier, a double-balanced mixer, a voltage-controlled oscillator, and an IF amplifier on a 1-mm2 GaAs chip. The FET circuits were matched by digital IC design rather than by the distributed element network technique, to use the substrate more effectively. Self-aligned WSi/Au gates 1.5 μm long were used, and the ... View full abstract»

• ### Theoretical and experimental characteristics of single V-groove guide for X-band and 100 GHz operation

Publication Year: 1988, Page(s):715 - 723
Cited by:  Papers (36)
| | PDF (544 KB)

A conformal mapping technique for single-groove guide is discussed and applied to grooves of V-shaped cross section. The approach is to transform the V-groove guide into the parallel-wall guide filled with a nonisotropic and nonuniform medium. Experimental measurements at X-band and 100 GHz confirm the theoretical predictions. The characteristic equation and scale factor of the fundamental mode ar... View full abstract»

• ### Attenuation distortion of transient signals in microstrip

Publication Year: 1988, Page(s):765 - 769
Cited by:  Papers (28)
| | PDF (312 KB)

Attenuation distortion, and combinations of dispersion and attenuation distortions, of transient signals in microstrip lines are investigated. Conduction losses are considered for the general case where the strip conductor resistivity is different from that of the ground plane. Dielectric losses are examined for commonly used isotropic substrates. Attenuation and dispersion distortions of short pu... View full abstract»

• ### A dual-frequency 183/380 GHz receiver for airborne application

Publication Year: 1988, Page(s):694 - 700
Cited by:  Papers (3)
| | PDF (804 KB)

A complete dual-frequency cryogenic heterodyne receiver operating at 183 and 380 GHz is described. The cooled mixers are whisker-contacted GaAs Schottky diodes mounted in reduced-height fundamental-mode waveguide. The local oscillators are Gunn-oscillator-driven multipliers using GaAs varactor diodes as the harmonic generators. Quasi-optical techniques are used extensively for coupling the remote ... View full abstract»

• ### Microwave noise characterization of GaAs MESFET's: determination of extrinsic noise parameters

Publication Year: 1988, Page(s):745 - 751
Cited by:  Papers (38)
| | PDF (636 KB)

A previously proposed noise equivalent circuit model for a GaAs MESFET (M. S. Gupta et al., ibid., vol.35, no.12, p.1208-18, 1987) is supplemented with a model for device parasitics, in order to calculate the noise parameters of a mounted GaAs MESFET. The calculated parameters are in good agreement with measured noise parameters from 2 to 18 GHz. The model is thus established as a valid representa... View full abstract»

• ### Low-phase-noise Gunn diode oscillator design

Publication Year: 1988, Page(s):792 - 794
Cited by:  Papers (23)
| | PDF (244 KB)

Low-phase-noise Gunn diode oscillators with an operating frequency of 35 GHz and an output power of 100 mW are designed, fabricated, and tested. The phase noise is -132 dBc/Hz to -125 dBc/Hz at 100-kHz offset from the center frequency. This low phase noise is obtained by closely coupling the stabilizing transmission cavity resonator and the Gunn-diode-oscillator coaxial line while loosely coupling... View full abstract»

## Aims & Scope

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..

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Luca Perregrini
luca.perregrini@unipv.it

Editor-in-Chief
Jose Carlos Pedro
edit.tmtt@ua.pt