# IEEE Transactions on Microwave Theory and Techniques

## Filter Results

Displaying Results 1 - 25 of 32

Publication Year: 2011, Page(s):C1 - C4
| PDF (50 KB)
• ### IEEE Transactions on Microwave Theory and Techniques publication information

Publication Year: 2011, Page(s): C2
| PDF (44 KB)
• ### A Spectral-Element Method for the Analysis of 2-D Waveguide Devices With Sharp Edges and Irregular Shapes

Publication Year: 2011, Page(s):1685 - 1695
Cited by:  Papers (12)
| | PDF (755 KB) | HTML

This paper presents an efficient implementation of spectral-element methods (SEMs) for the analysis of 2-D wave guide components with sharp edges. The well-known problem of ill conditioning of the mass matrix when very high-order polynomial basis functions are augmented with singular functions is addressed. A numerical process for the definition of a set of orthonormal entire-domain boundary-adapt... View full abstract»

• ### Transfer Function Analysis and Broadband Scalable Model for On-Chip Spiral Inductors

Publication Year: 2011, Page(s):1696 - 1708
Cited by:  Papers (16)
| | PDF (2077 KB) | HTML

Recent models for on-chip spiral inductors have been extensively examined and compared by transfer function analysis. Through the calculation of the transfer functions for the models, including T-, 1-π, and 2-π models, the pros and cons of equivalent circuit topology of each model are evaluated. It is found that the number of poles provided by a certain topology is a constant, while ... View full abstract»

• ### Generalized Methods for the Design of Quasi-Ideal Symmetric and Asymmetric Coupled-Line Sections and Directional Couplers

Publication Year: 2011, Page(s):1709 - 1718
Cited by:  Papers (23)
| | PDF (655 KB) | HTML

Generalized methods for the design of quasi-ideal symmetric and asymmetric coupled-line sections have been proposed. Two cases of coupled-line sections, in which the inductive coupling coefficient is either greater or smaller than the capacitive coupling coefficient, have been separately considered. To compensate for the coupling coefficients' inequality, a combination of lumped capacitors and sho... View full abstract»

• ### A Slow-Wave Multilayer Synthesized Coplanar Waveguide and Its Applications to Rat-Race Coupler and Dual-Mode Filter

Publication Year: 2011, Page(s):1719 - 1729
Cited by:  Papers (6)
| | PDF (1485 KB) | HTML

Abstract-We investigate a novel slow-wave structure, namely, the multilayer synthesized coplanar waveguide (CPW), in this paper. This new slow-wave structure is developed on a double-layer printed circuit board with the quasi-lumped inductors and capacitors placed on the opposite side of the substrate. The new design has a high slow-wave factor of 9-10 and moderate un loaded quality factor of 20-3... View full abstract»

• ### Analytical Design of Microstrip Short-Circuit Terminated Stepped-Impedance Resonator Dual-Band Filters

Publication Year: 2011, Page(s):1730 - 1739
Cited by:  Papers (49)
| | PDF (888 KB) | HTML

This paper proposes an analytical method to design a dual-band Alter using the short-circuit terminated half-wavelength stepped-impedance resonator (SIR). The SIR has an advantage to easily control the first and second resonances by adjusting its structural parameters. In the proposed method, the structural parameters of the SIR are obtained analytically according to the two passband center freque... View full abstract»

• ### Broadband Substrate Integrated Waveguide 4$,times,$4 Nolen Matrix Based on Coupler Delay Compensation

Publication Year: 2011, Page(s):1740 - 1745
Cited by:  Papers (11)
| | PDF (1273 KB) | HTML

A broadband Nolen matrix in substrate integrated waveguide (SIW) technology is proposed and studied in this paper. Being serial feeding networks, Nolen matrices usually introduce significant phase dispersion in their standard form, thus limiting effective bandwidth. In this work, broadband frequency operation is achieved with adequate coupler delay compensation, resulting in a more "parallel" matr... View full abstract»

• ### RF MEMS Capacitive Switches for Wide Temperature Range Applications Using a Standard Thin-Film Process

Publication Year: 2011, Page(s):1746 - 1752
Cited by:  Papers (13)
| | PDF (630 KB) | HTML

In this paper, the design, fabrication, and measurements of a capacitive RF microelectromechanical systems (RF MEMS) switch with very low sensitivity to thermal stress is presented. The switch is built by thin-film technology (0.8-μm Au) and shows <;50-mV/°C variation in the pull-down voltage at 25 °C-125 °C. The effects of the residual biaxial stress and stress grad... View full abstract»

• ### Nonlinear Characterization of Varactors for Tunable Networks by Active Source–Pull and Load–Pull

Publication Year: 2011, Page(s):1753 - 1760
Cited by:  Papers (3)
| | PDF (902 KB) | HTML

Varactors are key components in the realization of tunable networks, for instance, in high-efficiency power-amplifier architectures. This paper presents a method to measure the varactor quality factor (Q-factor) in the presence of nonlinear distortion. The importance of correctly choosing the loading condition at the second harmonic is illustrated by multiharmonic active source- and load-pull meas... View full abstract»

• ### A CAD Model for Creep Behavior of RF-MEMS Varactors and Circuits

Publication Year: 2011, Page(s):1761 - 1768
Cited by:  Papers (7)
| | PDF (1191 KB) | HTML

In this paper, we propose a compact computer-aided design (CAD) model that may be utilized to simulate the creep behavior of RF microelectromechanical systems (RF-MEMS) varactors in RF circuits and subsystems. This model is capable of calculating the long-term response of RF-MEMS devices to an arbitrary input waveform. It is implemented using Agilent's Advanced Design System (ADS). The presented C... View full abstract»

• ### RF-MEMS Uniplanar 180 $^{circ}$ Phase Switch Based on a Multimodal Air-Bridged CPW Cross

Publication Year: 2011, Page(s):1769 - 1777
Cited by:  Papers (4)
| | PDF (1088 KB) | HTML

In this paper, a new compact broadband uniplanar 180° phase switch, based on an air-bridged coplanar-waveguide (CPW) cross loaded with two capacitive-contact microelectromechancial systems (MEMS) switches in opposed (on/off) states, is presented. The two phase-switch states (0°/180°) are defined by actuating the MEMS switches from on/off to off/on. The asymmetry in the states ... View full abstract»

• ### CMOS Passive Phase Shifter With Group-Delay Deviation of 6.3 ps at $K$-Band

Publication Year: 2011, Page(s):1778 - 1786
Cited by:  Papers (15)
| | PDF (1562 KB) | HTML

This paper presents a CMOS vector-sum-based phase shifter with a flat group-delay deviation of 6.3 ps at K-band. The theoretical analyses confirm the effects of the nonideal phase-invertible variable attenuator (PIVA) on the increasing of the root-mean-square (rms) phase error and magnitude variation of the phase shifter. The design procedures, which can eliminate the effects from the voltage-depe... View full abstract»

• ### Optimization for Envelope Shaped Operation of Envelope Tracking Power Amplifier

Publication Year: 2011, Page(s):1787 - 1795
Cited by:  Papers (66)  |  Patents (4)
| | PDF (1514 KB) | HTML

This paper describes the analysis of an optimized envelope shaping function for the envelope tracking power amplifier (ET PA) and its implementation. The proposed shaping function, which is sweet spot tracking with crest factor reduction, improves the efficiency and output power of the power amplifier (PA), as well as its linearity. For an accurate simulation of the supply modulator, an equivalent... View full abstract»

• ### A New Power Management IC Architecture for Envelope Tracking Power Amplifier

Publication Year: 2011, Page(s):1796 - 1802
Cited by:  Papers (43)  |  Patents (58)
| | PDF (1151 KB) | HTML

A new supply modulator architecture for robust performance against the battery voltage variation is presented. The resulting modulator is an optimized power management integrated circuit (PMIC) for an envelope tracking (ET) power amplifier (PA). The basic topology of the PMIC is based on a hybrid switching amplifier combining a wideband class-AB buffered linear amplifier and a highly efficient swi... View full abstract»

• ### Asymmetric Coupled-Line Directional Couplers as Impedance Transformers in Balanced and $n$-Way Power Amplifiers

Publication Year: 2011, Page(s):1803 - 1810
Cited by:  Papers (8)
| | PDF (549 KB) | HTML

Asymmetric 3-dB coupled-line directional couplers for application in balanced circuits have been considered, and it has been theoretically shown that such couplers allow for simultaneous (equal) power division and impedance transformation. A limitation on achievable impedance ratio has been derived. The theoretical analysis has been experimentally verified by the measurements of a number of passiv... View full abstract»

• ### $G_{m}$ -Boosted Differential Drain-to-Source Feedback Colpitts CMOS VCO

Publication Year: 2011, Page(s):1811 - 1821
Cited by:  Papers (11)
| | PDF (2328 KB) | HTML

This paper proposes a gm-boosted differential drain-to-source feedback Colpitts voltage-controlled oscillator (VCO) that allows larger output oscillation amplitude while keeping the switching transistor from triode-mode operation such that lower optimal close-in phase noise can be obtained by delaying the AM-to-FM conversion by the switching transistors. The phase-noise behavior of the ... View full abstract»

• ### LC-VCO Design Optimization Methodology Based on the $g_m/I_D$ Ratio for Nanometer CMOS Technologies

Publication Year: 2011, Page(s):1822 - 1831
Cited by:  Papers (26)
| | PDF (1015 KB) | HTML

In this paper, an LC voltage-controlled oscillator (LC VCO) design optimization methodology based on the gm/ID tech nique and on the exploration of all inversion regions of the MOS transistor (MOST) is presented. An in-depth study of the com promises between phase noise and current consumption permits optimization of the design for given specifications. Semiempirical models o... View full abstract»

• ### Merged Clock Data Recovery and 24-GHz LO Generation Circuit for Crystalless Transcseiver

Publication Year: 2011, Page(s):1832 - 1839
Cited by:  Papers (2)
| | PDF (1449 KB) | HTML

A fully integrated merged 400-Mb/s clock data recovery (CDR) local oscillator (LO) generation circuit that provides both a 24-GHz local oscillation signal for an up-conversion mixer in a transmitter and a 400-MHz sampling clock for an ADC in a receiver for a crystalless wireless transceiver is demonstrated. The phase noise of the 24-GHz LO signal is -89 dBc/Hz at 1-MHz offset for a 400-Mb/s pseudo... View full abstract»

• ### A Novel Full Phase-Coherent Frequency Synthesis Method for SFWF Radar Application

Publication Year: 2011, Page(s):1840 - 1845
| | PDF (678 KB) | HTML

A novel method of full phase-coherent synthesis is proposed in this paper, which uses the frequency-converting technology and the phase-locked loop to fulfill the transmission and tracking of the frequency and phase between the main loop and secondary loops. This method, which differs from the traditional converting-filtering scheme, can solve the tradeoff between the frequency difference and the ... View full abstract»

• ### A CMOS MedRadio Receiver RF Front-End With a Complementary Current-Reuse LNA

Publication Year: 2011, Page(s):1846 - 1854
Cited by:  Papers (14)
| | PDF (1121 KB) | HTML

An ultra-low-power 401-406-MHz Medical Device Radiocommunications Service receiver RF front-end for biomedical telemetry applications is implemented using 0.18-μm CMOS technology. A single-ended complementary current-reuse low-noise amplifier (CCRLNA) is proposed that achieves a power gain of 20 dB, noise figure (NF) of 2.8 dB, IIP3 of -8.1 dBm, and second-order intercept point of +34 dBm w... View full abstract»

• ### A Circular Patch Resonator for the Measurement of Microwave Permittivity of Nematic Liquid Crystal

Publication Year: 2011, Page(s):1855 - 1862
Cited by:  Papers (7)
| | PDF (733 KB) | HTML

This paper presents a method of performing microwave characterizations of nematic liquid crystals using a circular patch resonator and finite-element software. This technique, which is based on inferring material properties from measured resonances, was demonstrated with BL006 (a nematic liquid-crystal mixture) over the frequency range of 4.8-8.7 GHz. The resonator comprises a thin liquid-crystal ... View full abstract»

• ### Permittivity Measurements at Microwave Frequencies Using Epsilon-Near-Zero (ENZ) Tunnel Structure

Publication Year: 2011, Page(s):1863 - 1868
Cited by:  Papers (13)
| | PDF (858 KB) | HTML

A planar epsilon-near-zero (ENZ) tunnel structure implemented on substrate integrated waveguide (SIW) technology is used to evaluate the complex dielectric permittivity of various materials. Design, optimization, and fabrication of the ENZ tunnel structure are explained. Simulations and measurements on various dielectric samples using the cavity perturbation technique of the proposed structure are... View full abstract»

• ### Integration of SiP-Based 60-GHz 4 $,times,$4 Antenna Array With CMOS OOK Transmitter and LNA

Publication Year: 2011, Page(s):1869 - 1878
Cited by:  Papers (12)
| | PDF (2036 KB) | HTML

An integrated system-in-package-based 60-GHz 4 × 4 antenna array with CMOS on-off keying (OOK) transmitter and low-noise amplifier (LNA) is investigated. The 4 × 4 circular polarized array exhibits a wide impedance bandwidth (VSWR <; 2) and 3-dB axial ratio bandwidth of over 8 GHz using a strip line sequential rotation feeding scheme. It has a beam-shaped pattern with a 3-dB beamw... View full abstract»

• ### Multifunctional Transceiver for Future Intelligent Transportation Systems

Publication Year: 2011, Page(s):1879 - 1892
Cited by:  Papers (10)
| | PDF (1933 KB) | HTML

A multifunctional transceiver for future intelligent transportation systems (ITSs) is proposed and presented in this paper. The transceiver has two operation modes, namely, radar (sensing) mode and radio (communication) mode, which are realized within a single hardware platform. In the proposed transceiver architecture, a special modulation scheme is devised in which the radar mode and radio mode ... 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