# 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»

• ### 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»

• ### 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»

• ### 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»

• ### 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»

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

Publication Year: 1988, Page(s):759 - 763
Cited by:  Papers (77)
| |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»

• ### 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»

• ### 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»

• ### 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»

• ### 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»

• ### Propagation constant determination in microwave fixture de-embedding procedure

Publication Year: 1988, Page(s):706 - 714
Cited by:  Papers (61)
| |PDF (492 KB)

An improper choice of dimensions for the standards used in the microwave de-embedding procedure will cause errors in the determination of the propagation constant. This leads to unrealistic values for the attenuation constant, which in turn causes errors in the de-embedded results. Proper selection of dimensions is made to minimize such errors. Physically realistic values are obtained with this se... View full abstract»

• ### TE-TM mode conversion of an optical beam wave in thin-film optical waveguides

Publication Year: 1988, Page(s):783 - 785
| |PDF (184 KB)

The TE-TM mode conversion efficiency when a Gaussian beam wave propagates in thin-film optical waveguides is discussed. For film thicknesses at which strong coupling between the TE and TM modes is obtained, two hybrid modes have oppositely rotating circular polarizations, or linear polarizations perpendicular to each other with equal magnitude of TE-wave and TM-wave components. In the former (i.e.... View full abstract»

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

Publication Year: 1988, Page(s):752 - 756
Cited by:  Papers (19)
| |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»

• ### 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»

• ### High-speed GaAs dynamic frequency divider using a double-loop structure and differential amplifiers

Publication Year: 1988, Page(s):772 - 774
Cited by:  Papers (3)
| |PDF (224 KB)

GaAs 2.0-8.0-GHz and 6.0-10.5-GHz dynamic frequency dividers have been developed. These dynamic dividers have a double-loop structure using a differential amplifier for high-speed and stable operation despite supply-voltage fluctuations. This structure operates from a single voltage supply. An advanced WSi self-aligned gate process technology (0.1-μm long gate) was used to improve the high-freq... View full abstract»

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

Publication Year: 1988, Page(s):792 - 794
Cited by:  Papers (24)
| |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»

• ### Equivalent transformations for the mixed lumped Richards section and distributed transmission line

Publication Year: 1988, Page(s):635 - 641
Cited by:  Papers (6)
| |PDF (428 KB)

The authors introduce an analysis method for nonuniform transmission lines. Equivalent transformations between a circuit consisting of a cascade connection of a lumped Richards section, an ideal transformer, and a distributed transmission line and one consisting of a cascade connection of a class of a nonuniform transmission line, a lumped Richards section, and an ideal transformer, are given. Cha... 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»

• ### 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»

• ### Analysis to two-tone, third-order distortion in cascaded two-ports

Publication Year: 1988, Page(s):701 - 705
Cited by:  Papers (13)
| |PDF (384 KB)

The third-order intermodulation distortion (IMD) of a system composed of a number of cascaded two-port networks is considered. The two-tone, third-order intercept point (IP) is highly dependent on the phase angles of the IMD signals, which are usually unknown to the system designer. Consequently, worst-case design strategies are normally used in these situations. General bound formulas are develop... 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»

• ### The influence of ion-implanted profiles on the performance of GaAs MESFET's and MMIC amplifiers

Publication Year: 1988, Page(s):642 - 652
Cited by:  Papers (13)
| |PDF (888 KB)

The RF small-signal performance of GaAs MESFETs and MMIC amplifiers as a function of various ion-implanted profiles is theoretically and experimentally investigated. Implantation energy, dose, and recess-depth influence are theoretically analyzed with the help of a novel device simulator. The performance of MMIC amplifiers processed with various energies, doses, recess depths, and bias conditions ... 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»

## 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..

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## Meet Our Editors

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

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