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# IEEE Transactions on Microwave Theory and Techniques

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Displaying Results 1 - 25 of 36

Publication Year: 2012, Page(s):C1 - C4
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• ### IEEE Transactions on Microwave Theory and Techniques publication information

Publication Year: 2012, Page(s): C2
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• ### Finite-Element Eigenvalue Analysis of Propagating and Evanescent Modes in 3-D Periodic Structures Using Model-Order Reduction

Publication Year: 2012, Page(s):2677 - 2683
Cited by:  Papers (4)
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Eigenvalue analysis of a periodic structure by the finite-element method gives its Floquet propagation constant at a given frequency. Using this method directly to find the dispersion curve is computationally expensive, particularly in 3-D, because a large matrix eigenproblem must be solved at each frequency. The cost can be lowered by applying model-order reduction. A full-size eigenproblem at on... View full abstract»

• ### SPICE Lumped Circuit Subcell Model for the Discontinuous Galerkin Finite-Element Time-Domain Method

Publication Year: 2012, Page(s):2684 - 2692
Cited by:  Papers (7)
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A SPICE lumped circuit subcell model is formulated within the discontinuous Galerkin finite-element time-domain (DGFETD) discretization of Maxwell's equations. A fourth-order exponential time difference (ETD) algorithm is used for circuits that lead to stiff systems. The ETD method reduces to a standard fourth-order Runge-Kutta (RK4) time-integration for nonstiff regions. A number of test cases, i... View full abstract»

• ### MPIE/MoM Acceleration With a General-Purpose Graphics Processing Unit

Publication Year: 2012, Page(s):2693 - 2701
Cited by:  Papers (5)
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In this paper, we describe an accelerated implementation of the Method of Moments (MoM). A framework is proposed, exploiting the graphics processing unit (GPU) computing power by means of the software platform compute unified device architecture (CUDA). The mixed-potential integral-equation formulation, applied to microstrip circuit modeling, is adopted, and both the impedance matrix computation a... View full abstract»

• ### An Instrumental Variable Vector-Fitting Approach for Noisy Frequency Responses

Publication Year: 2012, Page(s):2702 - 2712
Cited by:  Papers (2)
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This paper presents an efficient methodology to improve the convergence properties of vector fitting (VF) when the frequency data is contaminated by noise. The proposed algorithm uses an instrumental variable approach, which minimizes the biasing effect of the least squares solution caused by the noise of the data samples. These instruments are generated using the rational approximation of the pre... View full abstract»

• ### Analytical Adjoint Sensitivity Formula for the Scattering Parameters of Metallic Structures

Publication Year: 2012, Page(s):2713 - 2722
Cited by:  Papers (9)
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A novel sensitivity-analysis method is proposed to compute the S-parameter Jacobian with respect to metallic shape parameters. The formulation is analytical and is derived from Maxwell's equations directly. It is independent of the field solution method and the respective system matrix. It requires only the field solution on the object surface. The computation is a post-process and its over... View full abstract»

• ### Numerical Stability and Dispersion Analysis of the Precise-Integration Time-Domain Method in Lossy Media

Publication Year: 2012, Page(s):2723 - 2729
Cited by:  Papers (1)
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In this paper, both the numerical stability condition and dispersion relation of the precise-integration time-domain (PITD) method in lossy media are presented. It is found that the time step size of the PITD method is limited by both the spatial step size of the PITD method and the ratio of permittivity to conductivity. In numerical dispersion investigations, it is shown that: the numerical loss ... View full abstract»

• ### Full-Wave Analysis of Dielectric-Loaded Cylindrical Waveguides and Cavities Using a New Four-Port Ring Network

Publication Year: 2012, Page(s):2730 - 2740
Cited by:  Papers (6)
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In this paper, a full-wave method for the electromagnetic analysis of dielectric-loaded cylindrical and coaxial waveguides and cavities is developed. For this purpose, a new four-port ring network is proposed, and the mode-matching method is applied to calculate the generalized admittance matrix of this new structure. A number of analyses on dielectric-loaded waveguide structures and cavities have... View full abstract»

• ### Exact and Closed-Form Cutoff Wavenumbers of Elliptical Dielectric Waveguides

Publication Year: 2012, Page(s):2741 - 2751
Cited by:  Papers (2)
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The cutoff wavenumbers of the elliptical dielectric waveguide are calculated exactly and analytically. Two separate methods are used to solve this problem. The first method is based on the separation of variables technique using Mathieu functions and gives the exact cutoff wavenumbers. The system matrices of which the roots of their determinant should be determined are complicated because of the n... View full abstract»

• ### Fe-Rich Ferromagnetic Wires for Mechanical-Stress Self-Sensing Materials

Publication Year: 2012, Page(s):2752 - 2759
Cited by:  Papers (2)
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The possibility of using Fe-rich wires in mechanical stress self-sensing materials is investigated. To this end, a retrieval technique aimed to characterize the high-frequency magneto-impedance effect in ferromagnetic wires under mechanical stresses is proposed. The technique is based on the measurement of the wires inside a metallic rectangular waveguide, and it is validated through numerical sim... View full abstract»

• ### Broadband 90$^{circ}$ Differential Phase Shifter Constructed Using a Pair of Multisection Radial Line Stubs

Publication Year: 2012, Page(s):2760 - 2767
Cited by:  Papers (13)
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The current paper proposes a broadband 90° differential phase shifter using a pair of multisection radial transmission-line (TL) stubs. The scattering parameters of the differential phase shifter are calculated based on the radial TL theory to evaluate the differential phase shifter's performance. Global optimization is performed using the TL model followed by a local optimizatio... View full abstract»

• ### A Modified Wilkinson Power Divider With Isolation Bandwidth Improvement

Publication Year: 2012, Page(s):2768 - 2780
Cited by:  Papers (27)
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This paper proposes a novel modified Wilkinson power divider with wide isolation bandwidth. The isolation bandwidth can be extended by an additional isolation network (INW) in the circuits. An equal and an unequal 4-GHz modified Wilkinson power divider on FR4 with compact circuit sizes are designed and measured to verify the new design concept. The measurement results show the operation bandwidth ... View full abstract»

• ### Design of Multiway Power Divider by Using Stepped-Impedance Transformers

Publication Year: 2012, Page(s):2781 - 2790
Cited by:  Papers (14)
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In this paper, the design of multiway power dividers by interconnecting power dividers with fewer output ports is studied by transforming them into multisection stepped-impedance transformers. By using this approach, it is easy to design multiway power dividers with required equal ripples of input reflection (S11 ) within a wide passband. The interconnecting lines can be used as additional ... View full abstract»

• ### A New Balanced-to-Balanced Power Divider/Combiner

Publication Year: 2012, Page(s):2791 - 2798
Cited by:  Papers (38)
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In this paper, a new balanced-to-balanced power divider/combiner is proposed. By using matrix transformation, two three-port networks for the odd- and even-mode circuit models are deduced, based on the constraint rules of the mixed-mode S -parameters. In order to satisfy the two required scattering matrices simultaneously, the resistances of lumped elements, the characteristic impedances an... View full abstract»

• ### Miniature Quasi-Lumped-Element Wideband Bandpass Filter at 0.5–2-GHz Band Using Multilayer Liquid Crystal Polymer Technology

Publication Year: 2012, Page(s):2799 - 2807
Cited by:  Papers (16)
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Miniature wideband bandpass filters are proposed using multilayer liquid crystal polymer (LCP) technology to cover the very low-frequency band of 0.5-2 GHz. To reduce the filter size at such low frequencies, lumped-element theory is used for the filter design and a value extraction process is developed to accurately get the capacitive or inductive values of different multilayer microstrip quasi-lu... View full abstract»

• ### Dual-Mode Ring Resonator Bandpass Filter With Asymmetric Inductive Coupling and Its Miniaturization

Publication Year: 2012, Page(s):2808 - 2814
Cited by:  Papers (15)
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Dual-mode ring resonator filters are implemented with asymmetric inductive perturbation for creating transmission zeros on both sides of the passband. In analysis, dependence of the resonance modes and the zeros on positions and sizes of both the inductive and capacitive perturbations is investigated. Under certain conditions, the even- and odd-mode frequencies for a capacitively perturbed ring ar... View full abstract»

• ### A Highly Reconfigurable Low-Power CMOS Directional Coupler

Publication Year: 2012, Page(s):2815 - 2822
Cited by:  Papers (8)  |  Patents (1)
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This paper presents a highly reconfigurable, low-power, and compact directional coupler. The coupler uses varactors and novel active inductors to achieve wide tuning ranges of operating frequencies and coupling coefficients. The use of a low-pass circuit architecture with only two inductors minimizes chip area, power consumption, and noise. The coupler is implemented in a 0.13-μm CMOS proce... View full abstract»

• ### A 1.1-V Regulator-Stabilized 21.4-GHz VCO and a 115% Frequency-Range Dynamic Divider for $K$ -Band Wireless Communication

Publication Year: 2012, Page(s):2823 - 2832
Cited by:  Papers (8)
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A 21.4-GHz 1.1-V regulator-stabilized voltage-controlled oscillator (VCO) with a dual-transformer configuration and a 115% frequency-range dynamic divider-both based on 0.18-μm SiGe BiCMOS technology-were developed. As for the VCO, the combination of two types of transformers, which exhibit high input impedance and capacitive-input impedance, respectively, provides both wide frequency-tunin... View full abstract»

• ### Wideband Inductorless Balun-LNA Employing Feedback for Low-Power Low-Voltage Applications

Publication Year: 2012, Page(s):2833 - 2842
Cited by:  Papers (23)  |  Patents (1)
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A wideband inductorless low-noise-amplifier (LNA) with single-to-differential conversion for multistandard radio applications is proposed. Noise-suppressed current-mirror-based biasing is utilized to ensure stable operation under process, voltage, and temperature variations. The inherent gain of the common-source (CS) stage is re-used to boost the trans-conductance of the common-gate (CG) stage, a... View full abstract»

• ### A Precise Decibel-Linear Programmable Gain Amplifier Using a Constant Current-Density Function

Publication Year: 2012, Page(s):2843 - 2850
Cited by:  Papers (12)
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In this paper, a compensation technique for realizing a precise decibel-linear CMOS programmable gain amplifier (PGA) is described. The proposed PGA, employing an auxiliary pair, not only retains a constant current density but also offers a gain-independent bandwidth (BW). For verification, a compact PGA (0.1 mm2) is fabricated using a 0.13-μm CMOS process and measured. The measu... View full abstract»

• ### A Highly Linear and Efficient CMOS RF Power Amplifier With a 2-D Circuit Synthesis Technique

Publication Year: 2012, Page(s):2851 - 2862
Cited by:  Papers (1)
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A 2-D circuit synthesis technique (2DCST) is introduced that simultaneously linearizes the AM-AM and AM-PM distortions of CMOS RF power amplifiers (PAs). A class-AB nMOS RF PA fabricated in a 0.18-μm CMOS process is reported. With a WCDMA signal, the amplifier achieved 41.6% power-added efficiency (PAE) with -33-dBc single-adjacent channel power ratio (ACPR1) and 38.5% PAE with -40-dBc ACPR... View full abstract»

• ### A Transformer-Less Load-Modulated (TLLM) Architecture for Efficient Wideband Power Amplifiers

Publication Year: 2012, Page(s):2863 - 2874
Cited by:  Papers (24)  |  Patents (1)
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An architecture and design procedure for transformer-less load-modulated power amplifiers (PAs) having high efficiency at power back-off is presented. This architecture utilizes a comparable load modulation concept as in the Doherty PA; however, contrary to the Doherty PA, it neither requires an output impedance transformer, nor offset lines, which are the main limiting factors in designing wideba... View full abstract»

• ### Mitigation of Bandwidth Limitation in Wireless Doherty Amplifiers With Substantial Bandwidth Enhancement Using Digital Techniques

Publication Year: 2012, Page(s):2875 - 2885
Cited by:  Papers (24)
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This paper proposes a new method for extending the bandwidth of Doherty power amplifiers (PAs) in the digital domain. The bandwidth enhancement is achieved through a frequency-selective pre-compensation mechanism that is derived to prevent the efficiency degradation that naturally occurs as the frequency of operation deviates from the center frequency. A methodical analysis of the frequency respon... View full abstract»

• ### Microwave Chemical Sensing at Room Temperature Using an Overmoded Waveguide Design

Publication Year: 2012, Page(s):2886 - 2893
Cited by:  Papers (2)
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Microwave spectrometers have unique advantages in the ability to determine high-resolution features that are specific to a given chemical. Very sharp lines which correspond to quantum states of the chemical allow for unique identification of the chemical. Recent advances have shown the possibility of room-temperature microwave spectroscopy analysis in which the data are collected in a short amount... 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