# IEEE Transactions on Microwave Theory and Techniques

## Filter Results

Displaying Results 1 - 25 of 28

Publication Year: 2011, Page(s):C1 - C4
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• ### IEEE Transactions on Microwave Theory and Techniques publication information

Publication Year: 2011, Page(s): C2
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• ### Alternative Expression for the Phase Velocity of Electromagnetic Homogeneous Plane Waves

Publication Year: 2011, Page(s):2781 - 2787
Cited by:  Papers (1)
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We have established a different method to analyze various electromagnetic media. An analytical investigation has been carried out into the relation between the phase velocity, momentum density vector (MDV), and Poynting vector of plane waves in linear, homogeneous, and time-invariant media. Based on it, we have derived a novel dispersion relation for homogeneous plane waves and found an interestin... View full abstract»

• ### Time-Domain Field and Scattering Parameter Computation in Waveguide Structures by GPU-Accelerated Discontinuous-Galerkin Method

Publication Year: 2011, Page(s):2788 - 2797
Cited by:  Papers (8)
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In this paper, we demonstrate the discontinuous Galerkin finite-element method (DG-FEM) used for the computation of electromagnetic fields in the interior of 3-D structures with open waveguide ports. This method is particularly applied to derive frequency-dependent scattering parameters. The method allows explicit formulations in time domain on unstructured meshes with high polynomial approximatio... View full abstract»

• ### An Accurate and Efficient Evaluation of Planar Multilayered Green's Functions Using Modified Fast Hankel Transform Method

Publication Year: 2011, Page(s):2798 - 2807
Cited by:  Papers (2)
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When the fast Hankel transform (FHT) filter technique is used to calculate the spatial-domain Green's functions for planar multilayered media, it can be difficult to obtain accurate numerical results because of branch-cut singularities and the surface-wave pole singularities. Although the singularities can be efficiently avoided through deforming the integration path of the Hankel transform from t... View full abstract»

• ### 3-D Thin-Wire FDTD Analysis of Coaxial Probe Fed in Asymmetric Microwave Components

Publication Year: 2011, Page(s):2808 - 2815
Cited by:  Papers (4)
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For the coaxial probe fed in asymmetric microwave components, an improved scheme on the 3-D thin-wire (TW) finite-difference time-domain (FDTD) is implemented without additional grid refinements and/or auxiliary update terms. The fine geometrical discontinuity such as the conductive arm, feed aperture, and finite end of the coaxial probe is approximated to the quasi-static models. The near fields ... View full abstract»

• ### New Design Formulas for Impedance-Transforming 3-dB Marchand Baluns

Publication Year: 2011, Page(s):2816 - 2823
Cited by:  Papers (28)
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New design formulas for impedance-transforming 3-dB Marchand baluns are proposed. They are about the even- and odd-mode impedances of the coupled transmission-line sections of the Marchand baluns and determined by coupling coefficients together with termination impedances. The particular property proposed in this paper is to choose the coupling coefficient arbitrarily, resulting in infinite sets o... View full abstract»

• ### Directional Coupler Compensation With Optimally Positioned Capacitances

Publication Year: 2011, Page(s):2824 - 2832
Cited by:  Papers (10)
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An accurate design synthesis for the phase velocity compensation in coupled line microstrip couplers by means of parallel capacitances is presented. In contrast to previous approaches, an a priori arbitrary placement of the capacitances along the coupled line structure is considered. By optimizing these positions, the directivity-bandwidth performance is significantly improved. Cases with two and ... View full abstract»

• ### Generalized Two-Way Two-Section Dual-Band Wilkinson Power Divider With Two Absorption Resistors and Its Miniaturization

Publication Year: 2011, Page(s):2833 - 2847
Cited by:  Papers (22)
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A generalized two-way two-section dual-band Wilkinson power divider with two absorption resistors and its size-reduced model are presented. Design equations for dual-band and arbitrary power division are derived from modified even- and odd-mode analysis. The frequency ratio of the lower and upper band frequencies must be lower than three. The channel bandwidth is presented as a function of frequen... View full abstract»

• ### Unbalanced-to-Balanced and Balanced-to-Unbalanced Diplexer With High Selectivity and Common-Mode Suppression

Publication Year: 2011, Page(s):2848 - 2855
Cited by:  Papers (42)
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Two novel balun diplexers based on stub-loaded resonators are presented and carefully examined in this paper. Besides being diplexers, the two balun diplexers are also interface devices between a single-ended (differential) antenna and differential (single-ended) receiver and transmitter. The stub-loaded resonator not only has an extra degree of freedom to realize the anticipant coupling scheme, b... View full abstract»

• ### A Filtering Microstrip Antenna Array

Publication Year: 2011, Page(s):2856 - 2863
Cited by:  Papers (40)
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A new filtering microstrip antenna array is presented. The antenna elements, together with the very compact feeding network, function as a third-order bandpass filter. The feeding network, which consists of one power divider and two baluns, provides the first two stages, and the microstrip antenna elements provide the last stage in the filter design. The equivalent lumped circuit model is analyzed... View full abstract»

• ### Multilayer Planar Tunable Filter With Very Wide Tuning Bandwidth

Publication Year: 2011, Page(s):2864 - 2871
Cited by:  Papers (33)
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In this paper, we propose and develop a partially shielded tunable filter structure using a varactor-loaded split-ring resonator. The novel physical topology of the filter is suitable for vertical stacking of filters and enables a compact multilayer tunable filter for applications requiring a very wide tuning range. The capacitance range and ratio needed to achieve the designated tuning range are ... View full abstract»

• ### A Tunable Three-Pole 1.5–2.2-GHz Bandpass Filter With Bandwidth and Transmission Zero Control

Publication Year: 2011, Page(s):2872 - 2878
Cited by:  Papers (51)
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This paper presents a three-pole tunable combline bandpass filter with center frequency, bandwidth, and zero control. The filter is designed on a Duroid substrate with εr=10.2 and h=25 mil . A frequency range of 1.5-2.2 GHz with a 1-dB bandwidth tuning from 50 to 170 MHz (2.2%-11.2% fractional bandwidth) is achieved. The transmission zero can also be controlled, and a zero loc... View full abstract»

• ### A 40-Gb/s Full-Rate 2:1 MUX in 0.18- $mu{hbox {m}}$ CMOS

Publication Year: 2011, Page(s):2879 - 2887
Cited by:  Papers (3)
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This paper demonstrates high-speed design techniques that enable realization of a full-rate broadband serializer operating at 40 Gb/s using a 0.18-μm CMOS process. Bandwidth enhancement techniques, including shunt-peaking and multipole bandwidth enhancement, have been incorporated in the different high-speed blocks in the serializer. A dynamic retiming circuit capable of clocked 40-GHz oper... View full abstract»

• ### A CMOS Power Amplifier With Integrated-Passive-Device Spiral-Shaped Directional Coupler for Mobile UHF RFID Reader

Publication Year: 2011, Page(s):2888 - 2897
Cited by:  Papers (13)  |  Patents (1)
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A CMOS power amplifier (PA) with a compact spiral-shaped directional coupler for a mobile UHF RF identification (RFID) reader is proposed here, and its output power combiner and the directional coupler are implemented using an integrated passive device process. The two-chip solution not only enables a CMOS PA to be highly efficient, but also allows the directional coupler and the power combiner to... View full abstract»

• ### Digital Doherty Amplifier With Enhanced Efficiency and Extended Range

Publication Year: 2011, Page(s):2898 - 2909
Cited by:  Papers (41)  |  Patents (3)
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In this paper, a digital Doherty power amplifier (PA) with improved efficiency performance over a wide power range is proposed. The efficiency enhancement is achieved by using a digitally controlled dynamic input power distribution scheme implemented to improve the active load modulation mechanism and to minimize the drive power waste into the peaking branch at backed-off power levels. Furthermore... View full abstract»

• ### A 15-dBm SiGe BiCMOS PA for 77-GHz Automotive Radar

Publication Year: 2011, Page(s):2910 - 2918
Cited by:  Papers (13)
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This paper presents a 15-dBm power amplifier for 77-GHz automotive radar applications, which is fabricated in a 0.13-μm SiGe:C BiCMOS process featuring bipolar transistors with fT /fmax of 230/280 GHz. The circuit consists of a two-stage pseudodifferential cascode with fully integrated input/output matching networks. State-of-art performance is achieved with the propos... View full abstract»

• ### DC/RF Hysteresis in Microwave pHEMT Amplifier Induced by Gate Current—Diagnosis and Elimination

Publication Year: 2011, Page(s):2919 - 2930
Cited by:  Papers (3)
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In this paper, an X -band pseudomorphic HEMT power amplifier (PA) is reported with two kinds of hysteresis phenomena; the first occurs in the dc-IV measurement, and the second is observed in the power measurement. The unusual phenomena can be attributed to the gate current resulting from the impact ionization coupling with the gate bias resistor, which is usually observed in the design of R... View full abstract»

• ### High-Efficiency RF Pulsewidth Modulation of Class-E Power Amplifiers

Publication Year: 2011, Page(s):2931 - 2942
Cited by:  Papers (19)  |  Patents (2)
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A new switch-mode power-amplifier (SMPA) topology particularly suitable for energy efficient amplification of RF pulsewidth modulation (RF-PWM) signals is derived. It is analytically shown that high efficiency can be maintained over a wide power dynamic range if the imaginary part of the Class-E load impedance is varied along with the duty cycle (pulsewidth). Using the theory developed, an explici... View full abstract»

• ### Digitally Assisted Dual-Switch High-Efficiency Envelope Amplifier for Envelope-Tracking Base-Station Power Amplifiers

Publication Year: 2011, Page(s):2943 - 2952
Cited by:  Papers (40)  |  Patents (2)
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This paper presents a novel digitally assisted dual-switch envelope amplifier used for wideband high-efficiency envelope-tracking (ET) base-station power amplifiers (PAs). The proposed envelope amplifier comprises two switching buck converters to provide the high-power ET signal to the RF stage and a wideband linear stage to maintain the envelope signal accuracy. The control technique utilizes dig... View full abstract»

• ### Broadband $Gm$ -Boosted Differential HBT Doublers With Transformer Balun

Publication Year: 2011, Page(s):2953 - 2960
Cited by:  Papers (8)
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Broadband monolithic InGaP HBT frequency doublers for K-band application have been developed. The designs employ a Gm-boosted differential common-base configuration using either capacitive or transformer-based coupling between base and emitters. To the authors' best knowledge, these are the first frequency doublers utilizing the Gm-boosted configuration and the result demonstrate larger bandwidth ... View full abstract»

• ### Harmonic Sampling and Reconstruction of Wideband Undersampled Waveforms: Breaking the Code

Publication Year: 2011, Page(s):2961 - 2969
Cited by:  Papers (6)  |  Patents (1)
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In this paper, a method for measuring wideband waveforms correctly when undersampling is used as a digitizing technique is presented. Two major challenges arise when undersampling wideband waveforms: overlapping of aliased spectral bins of the digitized waveform and ambiguity in spectral bins standing on multiples of the Nyquist frequency. Those challenges are more pronounced when using wideband m... View full abstract»

• ### Cramér–Rao Bounds for Determination of Permittivity and Permeability in Slabs

Publication Year: 2011, Page(s):2970 - 2977
Cited by:  Papers (8)
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We compute the Cramér-Rao lower bounds for determination of isotropic permittivity and permeability in slabs using reflection and transmission data. The results apply to three common measurement situations: free space, rectangular waveguides, and coaxial waveguides. The bounds depend only on the available data and not on the actual inversion method used, making them suitable to evaluate a ... View full abstract»

• ### Ultra-Stable Very-Low Phase-Noise Signal Source for Very Long Baseline Interferometry Using a Cryocooled Sapphire Oscillator

Publication Year: 2011, Page(s):2978 - 2986
Cited by:  Papers (33)
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The design and implementation of a novel frequency synthesizer based on low phase-noise digital dividers and a direct digital synthesizer is presented. The synthesis produces two low noise accurate tunable signals at 10 and 100 MHz. We report the measured residual phase noise and frequency stability of the syn thesizer and estimate the total frequency stability, which can be expected from the synt... View full abstract»

• ### Frequency-Tunable Microwave Generation Based on Time-Delayed Optical Combs

Publication Year: 2011, Page(s):2987 - 2993
Cited by:  Papers (8)
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A novel approach to generating a frequency-tunable microwave signal based on time-delayed optical combs is proposed and demonstrated. The fundamental principle is to generate multiple optical combs with identical comb profile, but with each optical comb carried by an optical carrier at a different wavelength. If the optical carriers are spaced with an identical wavelength spacing, the optical comb... 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