# IEEE Transactions on Microwave Theory and Techniques

## Issue 7  Part 1 • July 2010

This issue contains several parts.Go to:  Part 2

## Filter Results

Displaying Results 1 - 25 of 33

Publication Year: 2010, Page(s):C1 - C4
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• ### IEEE Transactions on Microwave Theory and Techniques publication information

Publication Year: 2010, Page(s): C2
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• ### Power-Recycling Feedback System for Maximization of Leaky-Wave Antennas' Radiation Efficiency

Publication Year: 2010, Page(s):1641 - 1650
Cited by:  Papers (29)  |  Patents (1)
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A novel power-recycling feedback scheme is proposed for systematic maximization of the generally poor radiation efficiency of leaky-wave antennas (LWAs). In this scheme, the nonradiated power at the end of the LWA structure, instead of being lost in the terminating load, is fed back to the input of the LWA through a power-combining system, which constructively adds the input and feedback powers wh... View full abstract»

• ### 6-bit CMOS Digital Attenuators With Low Phase Variations for $X$-Band Phased-Array Systems

Publication Year: 2010, Page(s):1651 - 1663
Cited by:  Papers (33)  |  Patents (2)
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This paper presents 6-bit CMOS digital step attenuators with low phase variations. To mitigate the insertion phase variation of conventional switched Pi/T attenuators, the proposed attenuators employ a compensation circuit. This includes a low-pass filter for phase/amplitude correction. Analysis and comparison of two types of Pi-attenuators with the inductive and capacitive correction circuits are... View full abstract»

• ### A $2times V_{rm DD}$-Enabled Mobile-TV RF Front-End With TV-GSM Interoperability in 1-V 90-nm CMOS

Publication Year: 2010, Page(s):1664 - 1676
Cited by:  Papers (10)
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A 2 × VDD-enabled mobile-TV RF front-end with TV-GSM interoperability is described. It is an on/off-chip codesign employing externally three customized UHF/VHF preselect filters, an RF switch, and a balun. The integrated part includes: 1) a cascode-cascade inverter-based low-noise amplifier that features a high gain-to-power efficiency; 2) a linearized C-2C attenuator using relia... View full abstract»

• ### Design of a Highly Efficient 2–4-GHz Octave Bandwidth GaN-HEMT Power Amplifier

Publication Year: 2010, Page(s):1677 - 1685
Cited by:  Papers (60)  |  Patents (4)
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In this paper, the design, implementation, and experimental results of a high-efficiency wideband GaN-HEMT power amplifier are presented. A method based on source-pull/load-pull simulation has been used to find optimum source and load impedances across the bandwidth and then used with a systematic approach to design wideband matching networks. Large-signal measurement results show that, across 1.9... View full abstract»

• ### An Integrated Divide-by-Two Direct Injection-Locking Frequency Divider for Bands $S$ Through $K_{u}$

Publication Year: 2010, Page(s):1686 - 1695
Cited by:  Papers (14)  |  Patents (1)
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In this work, direct injection locking is applied to a ring oscillator topology to design a wideband divide-by-two frequency divider circuit with a locking range covering bands S through Ku, namely input frequencies from 2 to 16 GHz. A thorough analysis is carried out: a behavioral model is developed that allows us to capture the operation of the two-stage differential rin... View full abstract»

• ### An Octa-Push Oscillator at $V$-Band

Publication Year: 2010, Page(s):1696 - 1702
Cited by:  Papers (2)
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In this paper, an octa-push oscillator is first presented. An N-push oscillator principle is effectively adopted. The proposed oscillator consists of eight sub-circuits, a microstrip ring resonator, and an output circuit. The microstrip ring resonator plays the role of both resonator and power-combiner circuit. This oscillator has the advantages of easy circuit design and the miniaturization of th... View full abstract»

• ### Large Improvement in Image Rejection of Double-Quadrature Dual-Conversion Low-IF Architectures

Publication Year: 2010, Page(s):1703 - 1712
Cited by:  Papers (16)
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The reasons for a degradation of image-rejection performance in double-quadrature-double-quadrature and single-quadrature-double-quadrature dual-conversion low-IF downconverters are fully discussed in this paper. Polyphase filters (PPFs) are inserted at proper positions to minimize the effects of device/signal mismatches, and thus improve the image rejection without calibration. Both a 0.35-;... View full abstract»

• ### Harmonic Generation Using Nonlinear LC Lattices

Publication Year: 2010, Page(s):1713 - 1723
Cited by:  Papers (7)
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Nonlinear LC lattices have shown promise for high-power high-frequency signal generation. Here we offer the first detailed study of the frequency response of these lattices, as well as a method designed to find input excitation frequencies that result in intense harmonic generation. The crux of the method is to locate regions in frequency space where the spectral norm of the lattice response matri... View full abstract»

• ### Design of a 60-GHz Substrate Integrated Waveguide Butler Matrix—A Systematic Approach

Publication Year: 2010, Page(s):1724 - 1733
Cited by:  Papers (29)
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A 60-GHz substrate integrated waveguide Butler matrix designed based on a systematic approach is fabricated by a standard single-layer print circuit board process, which is more economical for mass production than are the advanced processes such as low-temperature co-fired ceramic, thick-film process, etc. The systematic approach involves design equations, simulations, and measurements. Starting w... View full abstract»

• ### Electromagnetic-Bandgap Waveguide for the Millimeter Range

Publication Year: 2010, Page(s):1734 - 1741
Cited by:  Papers (17)
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This paper presents the design, manufacturing, and characterization of a waveguide based on electromagnetic-bandgap (EBG) technology working in W-band. A modified silicon EBG woodpile structure was used in order to improve the matching performance of the EBG waveguide to a standard rectangular waveguide. The transition between the silicon EBG woodpile waveguide and the conventional WR10 waveguide ... View full abstract»

• ### Amplitude Offset Estimation by Phase Comparison in Suppression Loops

Publication Year: 2010, Page(s):1742 - 1747
Cited by:  Papers (2)
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In this paper, a new architecture for an RF amplitude comparator circuit is introduced. The technique employs a trigonometric relationship enacted by passive RF components to map the amplitude ratio between two co-spectral RF signals into a phase difference. The theory of operation of the circuit is discussed in detail and the results of a practical investigation are presented, validating the appr... View full abstract»

• ### Self-Calibrated Two-Point Delta–Sigma Modulation Technique for RF Transmitters

Publication Year: 2010, Page(s):1748 - 1757
Cited by:  Papers (21)
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A self-calibrated two-point delta-sigma modulation technique for CMOS RF transmitter is proposed. This calibration technique employs voltage-controlled oscillator (VCO) and delta-sigma modulator input ports in a frequency synthesizer. By monitoring the control voltage of a loop filter, the gain mismatch between two paths can be detected and completely calibrated by modifying the gain of the VCO pa... View full abstract»

• ### Identifying RF Identification Cards From Measurements of Resonance and Carrier Harmonics

Publication Year: 2010, Page(s):1758 - 1765
Cited by:  Papers (4)  |  Patents (1)
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We show that careful measurements of the unloaded resonance frequency and quality factor of RF identification proximity cards allow identification of different card models and, for the set of cards we studied, identification with minimal error of individual cards of the same model. Furthermore, we show that card identification performance is improved by considering an electromagnetic signature tha... View full abstract»

• ### Anisotropic 3-D Composite Right/Left-Handed Metamaterial Structures Using Dielectric Resonators and Conductive Mesh Plates

Publication Year: 2010, Page(s):1766 - 1773
Cited by:  Papers (10)
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New configuration of anisotropic 3-D composite right/left-handed (CLRH) metamaterial structures is proposed and designed. It is composed of stacked layers using conductive mesh plates and dielectric layers including 2-D array of dielectric resonators. Balanced CLRH transmission structures are designed not only for both polarization and propagation directions in the layer plane, but also for the no... View full abstract»

• ### High-Frequency Pulse Distortion on a Lossy Microstrip Line With a Top Cover

Publication Year: 2010, Page(s):1774 - 1785
Cited by:  Papers (5)
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This paper studies the time-domain propagation and dispersion of a pulse propagating on a microstrip line with a metallic top cover. A gap voltage source is used to model a practical excitation on the line. High-frequency distortion effects are observed that cannot be accounted for by conventional transmission-line theory, since they are due to the simultaneous excitation of the bound mode and a s... View full abstract»

• ### Formulas for the Number of Surface Waves on Layered Structures

Publication Year: 2010, Page(s):1786 - 1795
Cited by:  Papers (11)
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Closed-form expressions are derived for the number of surface waves propagating along a general multilayered structure with media having positive material parameters. The expressions shown here are also useful for the efficient numerical determination and ordering of the cutoff frequencies of surface waves on multilayered structures. The presented formulas are simple but exact. Validation is provi... View full abstract»

• ### Input Impedance of Nonperiodic Sources Exciting 1-D Periodic Shielded Microstrip Structures

Publication Year: 2010, Page(s):1796 - 1806
Cited by:  Papers (7)
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The input impedance of nonperiodic sources that excite a periodically loaded shielded microstrip line is studied numerically with a rigorous method-of-moments approach based on the array scanning method. Both a delta-gap voltage and an impressed vertical current sheet are considered to be idealized sources exhibiting different symmetry properties. Their input impedances, calculated according to ei... View full abstract»

• ### Homogenized Green's Functions for an Aperiodic Line Source Over Planar Densely Periodic Artificial Impedance Surfaces

Publication Year: 2010, Page(s):1807 - 1817
Cited by:  Papers (14)
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The accurate electromagnetic analysis of artificial periodic surfaces formed as planar layers with complicated periodic metallization patterns, having a grid period much smaller than the effective wavelength (densely periodic), is important for the design and analysis of a variety of electromagnetic structures. However, full-wave modeling can be extremely time-consuming and computationally expensi... View full abstract»

• ### A General Procedure for Introducing Structured Nonorthogonal Discretization Grids Into High-Order Finite-Difference Time-Domain Methods

Publication Year: 2010, Page(s):1818 - 1829
Cited by:  Papers (8)
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This paper describes a general procedure for introducing structured nonorthogonal discretization grids into any high-order finite-difference time-domain method originally formulated on a uniform rectangular grid. The proposed procedure employs a coordinate transformation to map a conformal grid-a grid where all cells conform to the material boundaries of the given problem-onto a uniform rectangula... View full abstract»

• ### An Efficient Algebraic Method for the Passivity Enforcement of Macromodels

Publication Year: 2010, Page(s):1830 - 1839
Cited by:  Papers (8)
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In this paper, an efficient algebraic method for the passivity enforcement of macromodels is presented. The method is based on quadratic programming with equality constraint. The differences between equality constraint and conventional inequality constraint are discussed. Compared with the general quadratic programming-based method, where the passivity violations are compensated via numerical opti... View full abstract»

• ### New Multiband Coupling Matrix Synthesis Technique and Its Microstrip Implementation

Publication Year: 2010, Page(s):1840 - 1850
Cited by:  Papers (22)
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In this paper, we present a novel analytical multiband transversal coupling matrix synthesis technique. By properly combining several single-band filtering functions, the multiband filtering function with flexible transmission zeros and various bandwidth are available. The transversal coupling scheme is then transformed into a practically realizable coupling scheme. To verify the feasibility of th... View full abstract»

• ### Novel Wideband Transition Between Coplanar Waveguide and Microstrip Line

Publication Year: 2010, Page(s):1851 - 1857
Cited by:  Papers (23)
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A novel wideband vertical transition for connecting the coplanar waveguide (CPW) to the microstrip line is proposed. This transition can be very useful for millimeter-wave packaging and vertical interconnects. It is multilayered, partly tapered, and consists of only one via interconnect. Two different transitions are designed. The first transition allows connectivity of a CPW with Zc=50... View full abstract»

• ### Design and Analysis of 1-D Uniform and Chirped Electromagnetic Bandgap Structures in Substrate-Integrated Waveguides

Publication Year: 2010, Page(s):1858 - 1866
Cited by:  Papers (12)
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We demonstrate the creation of an electromagnetic bandgap (stopband) within the passband of the fundamental mode of a substrate-integrated waveguide. The bandgap is achieved by periodically modulating the waveguide width using the metallic plated vias that form the effective waveguide sidewall. We describe the design of such a structure, noting that, compared with previously demonstrated 1-D trans... 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